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CMakeLists.txt
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# C M A K E L I S T S . T X T
# BRL-CAD
#
# Copyright (c) 2010-2021 United States Government as represented by
# the U.S. Army Research Laboratory.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# NOTE: BRL-CAD as a collective work is distributed under the LGPL.
# BRL-CAD's build system is under the BSD license.
# See the COPYING file for more details.
#
# ******************************************************************
#
# Early versions of this CMakeLists.txt file were based on the VTK
# CMakeLists.txt file, also licensed under Modified BSD.
# *******************************************************************
# *** BRL-CAD's CMakeLists.txt ***
# *******************************************************************
#
# This file defines the toplevel CMake build logic for BRL-CAD.
# As best as is reasonably possible, proper ordering and
# separation of tests and settings should be maintained per the
# recommended standard layout. The tests should be added to the
# labeled sections below so that they are organized in stages as
# follows:
#
# Stage 0 - information on the package and toplevel CMake settings
# Stage 1 - define top level options
# Stage 2 - check programs
# Stage 3 - check compiler characteristics
# Stage 4 - check libraries
# Stage 5 - check headers
# Stage 6 - check types/structures
# Stage 7 - check functions
# Stage 8 - check system services
# Stage 9 - define the BRL-CAD build targets
#
# The output summary should report key information about the final
# configuration of the build. Comprehensive information is available
# in the CMake cache file in the build directory, so just hit the
# high points in the summary.
#
# After the main configure process is finished, a summary is printed
# and various settings and configuration files that require full
# knowledge of the main configure results are handled.
#
# *******************************************************************
# *** Top Level Settings ***
# *******************************************************************
# This file contains the top level CMakeLists.txt logic for the
# BRL-CAD software package.
# Minimum required version of CMake
cmake_minimum_required(VERSION 3.12)
# set CMake project name
project(BRLCAD)
# install(CODE) uses generator expressions - requires 3.14 or newer.
# We want it to be on, but until we can bump our minimum requirement
# set it to OLD to make sure we don't break anything.
if (POLICY CMP0087)
cmake_policy(SET CMP0087 OLD)
endif (POLICY CMP0087)
# Test name character check - need to look into this one...
if (POLICY CMP0110)
cmake_policy(SET CMP0110 OLD)
endif (POLICY CMP0110)
#---------------------------------------------------------------------
# CMake derives much of its functionality from modules, typically
# stored in one directory - let CMake know where to find them. If we
# are a subbuild, let the parent's CMAKE_MODULE_PATH supply files before
# our own, otherwise misc/CMake takes first priority.
set(BRLCAD_CMAKE_DIR "${BRLCAD_SOURCE_DIR}/misc/CMake")
list(APPEND CMAKE_MODULE_PATH "${BRLCAD_CMAKE_DIR}")
#---------------------------------------------------------------------
# We definitely do not want a .gitattributes files present, as it is
# a potential source of subtle problems. Bail with an explanation if
# it is found to be present.
if (EXISTS "${BRLCAD_SOURCE_DIR}/.gitattributes")
message(FATAL_ERROR "\nBRL-CAD does not use a .gitattributes file in its repository. This is intended to prevent subtle errors from creeping in due to inadvertant pattern matches. See ${BRLCAD_SOURCE_DIR}/doc/git/mime_types.txt for an in-depth discussion of the recommended alternatives to use for the problems .gitattributes is intended to address.\n")
endif (EXISTS "${BRLCAD_SOURCE_DIR}/.gitattributes")
#---------------------------------------------------------------------
# Setup and checks related to system environment settings. Some of
# these impact search results needed to set default options, so we
# do this early in the process.
include(BRLCAD_Environment_Setup)
#---------------------------------------------------------------------
# Define various utilities.
include(BRLCAD_Util)
#---------------------------------------------------------------------
# Define the current BRL-CAD version.
# See HACKING for details on how to properly update the version
file(READ "${BRLCAD_SOURCE_DIR}/include/conf/MAJOR" BRLCAD_VERSION_MAJOR)
string(STRIP ${BRLCAD_VERSION_MAJOR} BRLCAD_VERSION_MAJOR)
file(READ "${BRLCAD_SOURCE_DIR}/include/conf/MINOR" BRLCAD_VERSION_MINOR)
string(STRIP ${BRLCAD_VERSION_MINOR} BRLCAD_VERSION_MINOR)
file(READ "${BRLCAD_SOURCE_DIR}/include/conf/PATCH" BRLCAD_VERSION_PATCH)
string(STRIP ${BRLCAD_VERSION_PATCH} BRLCAD_VERSION_PATCH)
set(BRLCAD_VERSION "${BRLCAD_VERSION_MAJOR}.${BRLCAD_VERSION_MINOR}.${BRLCAD_VERSION_PATCH}")
if(DEFINED BRLCAD_VERSION_AMEND)
set(BRLCAD_VERSION "${BRLCAD_VERSION}-${BRLCAD_VERSION_AMEND}")
endif(DEFINED BRLCAD_VERSION_AMEND)
#---------------------------------------------------------------------
# Let CMake know where to look for our counting file for configuration
# passes. It will impact whether we print certain messages
set(BRLCAD_CNT_FILE "${BRLCAD_BINARY_DIR}/CMakeTmp/BRLCAD_BUILD_COUNT")
if(NOT EXISTS ${BRLCAD_CNT_FILE})
set(BRLCAD_PRINT_MSGS 1)
else(NOT EXISTS ${BRLCAD_CNT_FILE})
set(BRLCAD_PRINT_MSGS 0)
endif(NOT EXISTS ${BRLCAD_CNT_FILE})
# Now that we know whether or not we're supposed to, print the CMake verison
if(BRLCAD_PRINT_MSGS)
message(STATUS "CMake version: ${CMAKE_VERSION}")
endif(BRLCAD_PRINT_MSGS)
#---------------------------------------------------------------------
# Define an option to use OBJECT libraries. If we are building with object
# libraries, we need position independent code.
include(CMakeDependentOption)
cmake_dependent_option(USE_OBJECT_LIBS "Use OBJECT libraries" ON "NOT MSVC" OFF)
mark_as_advanced(USE_OBJECT_LIBS)
if(USE_OBJECT_LIBS)
set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
endif(USE_OBJECT_LIBS)
#---------------------------------------------------------------------
# Record the CMake command line arguments (more or less) in
# CMakeFiles/CMakeOutput.log
record_cmdline_args()
#---------------------------------------------------------------------
# Set up the necessary support for timing of the configuration and
# build processes
string(TIMESTAMP CONFIG_DATE "%Y%m%d")
string(TIMESTAMP CONFIG_DATESTAMP "%a, %d %b %Y %H:%M:%S UTC" UTC)
#---------------------------------------------------------------------
# Mark the time at which the configuration process began.
set(CONFIG_DELTA_START "${CMAKE_BINARY_DIR}/CMakeTmp/CONFIG_DELTA_START")
execute_process(COMMAND "${CMAKE_COMMAND}" -DSTAMP_FILE=${CONFIG_DELTA_START} -P "${BRLCAD_CMAKE_DIR}/scripts/timestamp.cmake")
#---------------------------------------------------------------------
# Define relative install locations and output directories. Don't set
# these if they have already been set by some other means (like a
# higher level CMakeLists.txt file including this one).
# For output directories - where built library and executable
# files will be placed after building but prior to install. The
# necessary variables change between single and multi configuration
# build systems, so it is necessary to handle both cases on a
# conditional basis.
include(Path_Setup)
#---------------------------------------------------------------------
# Management of build types
if (NOT BRLCAD_IS_SUBBUILD)
include(BRLCAD_Build_Types)
endif (NOT BRLCAD_IS_SUBBUILD)
#---------------------------------------------------------------------
# For cleaning files as part of the distclean command, CMake needs
# to be aware of what various generators will (or might) write out
# in each build directory.
set(DISTCLEAN_OUTFILES
CTestTestfile.cmake
Testing/Temporary/CTestCostData.txt
Testing/Temporary/LastTest.log
)
if("${CMAKE_GENERATOR}" MATCHES "Make")
set(DISTCLEAN_OUTFILES ${DISTCLEAN_OUTFILES} Makefile)
endif("${CMAKE_GENERATOR}" MATCHES "Make")
if("${CMAKE_GENERATOR}" MATCHES "Ninja")
set(DISTCLEAN_OUTFILES ${DISTCLEAN_OUTFILES} build.ninja rules.ninja .ninja_log)
endif("${CMAKE_GENERATOR}" MATCHES "Ninja")
#---------------------------------------------------------------------
# CMake's default "make test" target is a bit limited - define
# our own "unit" and "check" targets that automate more of the
# dependency updating process.
include(BRLCAD_Test_Wrappers)
#---------------------------------------------------------------------
# Load macros that will be used to define the BRL-CAD
# build logic
include(BRLCAD_Options)
include(BRLCAD_Targets)
include(CheckTypeSize)
include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
#---------------------------------------------------------------------
# print out the title with a pretty box computed to wrap around
BOX_PRINT("*** Configuring BRL-CAD Release ${BRLCAD_VERSION}, Build ${CONFIG_DATE} ***" "*")
#---------------------------------------------------------------------
# Set up include paths for generated header files. For multi-config
# builds, make sure we get build-specific dirs.
if(CMAKE_CONFIGURATION_TYPES)
include_directories(${CMAKE_BINARY_DIR}/$<CONFIG>/${INCLUDE_DIR})
include_directories(${CMAKE_BINARY_DIR}/$<CONFIG>/${INCLUDE_DIR}/brlcad)
else(CMAKE_CONFIGURATION_TYPES)
include_directories(${CMAKE_BINARY_DIR}/${INCLUDE_DIR}/brlcad)
endif(CMAKE_CONFIGURATION_TYPES)
#---------------------------------------------------------------------
# We want to check /usr/local by default, so add it if it exists
if (IS_DIRECTORY /usr/local)
set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} /usr/local)
if (IS_DIRECTORY /usr/local/include)
set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} /usr/local/include)
endif (IS_DIRECTORY /usr/local/include)
endif (IS_DIRECTORY /usr/local)
#---------------------------------------------------------------------
# Intricacies involved with setting the install path mostly revolve
# around build type dependent install directories. Also needs the
# current version defined.
include(BRLCAD_Install_Prefix)
#---------------------------------------------------------------------
# The following logic is what allows binaries to run successfully in
# the build directory AND install directory. Thanks to plplot for
# identifying the necessity of setting CMAKE_INSTALL_NAME_DIR on OSX.
# Documentation of these options is available at
# http://www.cmake.org/Wiki/CMake_RPATH_handling
if (NOT COMMAND std_build_rpath)
include(RPath_Setup)
endif (NOT COMMAND std_build_rpath)
# We want the full RPATH set in the build tree so we can run programs without
# needing to set LD_LIBRARY_PATH
set(CMAKE_SKIP_BUILD_RPATH FALSE)
# We DON'T want the final install directory RPATH set in the build directory
# - it should only be set to the installation value when actually installed.
set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
# Add the automatically determined parts of the RPATH which point to
# directories outside the build tree to the install RPATH
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
# Set RPATH value to use when installing. This should be set to always
# prefer the version in the installed path when possible, but fall back on a
# location relative to the loading file's path if the installed version is
# not present. How to do so is platform specific.
relative_rpath(RELPATH)
set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${LIB_DIR}${RELPATH}")
std_build_rpath()
#---------------------------------------------------------------------
# We need compiler support for certain C and C++ standards when we
# build. Set CMake's flags accordingly for what source code syntax
# (i.e., -std=xxx flags) and API (i.e., -D_POSIX_C_SOURCE defines) to
# permit and utilize respectively. Common profiles:
#
# 2011-2016: C11 & C++11 (ignoring C++14, target: 2013)
# ISO/IEC 9899:2011 __STDC_VERSION__==201112L
# ISO/IEC 14882:2011 __cplusplus==201103L
# IEEE 1003.1-2008 -D_POSIX_C_SOURCE=200809L
# Open Group Single UNIX Specification, Version 4 (2008+) -D_XOPEN_SOURCE=700
# 2017-2020: C11 & C++17 (target: 2019)
# ISO/IEC 9899:2011 __STDC_VERSION__==201112L
# ISO/IEC 14882:2017 __cplusplus==201703L
# IEEE 1003.1-2008 -D_POSIX_C_SOURCE=200809L
# Open Group Single UNIX Specification, Version 4 (2008+) -D_XOPEN_SOURCE=700
#
# Sources: https://sourceforge.net/p/predef/wiki/Standards/
# For certain platforms (in particular Visual C++) we want to keep some pre-defined
# flags that are commonly used in the build logic.
if(NOT DEFINED CMAKE_C_FLAGS_DEFAULT)
set(CMAKE_C_FLAGS_DEFAULT "${CMAKE_C_FLAGS}" CACHE STRING "Default C flags" FORCE)
endif(NOT DEFINED CMAKE_C_FLAGS_DEFAULT)
mark_as_advanced(CMAKE_C_FLAGS_DEFAULT)
if(NOT DEFINED CMAKE_CXX_FLAGS_DEFAULT)
set(CMAKE_CXX_FLAGS_DEFAULT "${CMAKE_CXX_FLAGS}" CACHE STRING "Default CXX flags" FORCE)
endif(NOT DEFINED CMAKE_CXX_FLAGS_DEFAULT)
mark_as_advanced(CMAKE_CXX_FLAGS_DEFAULT)
# OpenBSD 6.6 doesn't tolerate these flags when using #include <iostream>,
# so we have to test
include(CheckCXXSourceRuns)
include(CMakePushCheckState)
function(BRLCAD_API_FLAG AFLAG AFLAGS)
set(CHECK_API_FLAG_SRC "
#include <iostream>
int main(int ac, char *av[])
{
if (ac > 0 && av)
std::cout << \"hello\";
return 0;
}
")
string(TOUPPER "${AFLAG}" UAFLAG)
string(REPLACE "-" "_" AFLAGVAR "${UAFLAG}")
string(REPLACE "=" "_" AFLAGVAR "${AFLAGVAR}")
cmake_push_check_state()
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${C_STANDARD_FLAGS} ${AFLAG}")
check_cxx_source_runs("${CHECK_API_FLAG_SRC}" WORKING_${AFLAGVAR})
cmake_pop_check_state()
if(WORKING_${AFLAGVAR})
set(${AFLAGS} "${${AFLAGS}} ${AFLAG}" PARENT_SCOPE)
endif(WORKING_${AFLAGVAR})
endfunction(BRLCAD_API_FLAG)
set(API_FLAGS)
BRLCAD_API_FLAG("-D_POSIX_C_SOURCE=200809L" API_FLAGS)
BRLCAD_API_FLAG("-D_XOPEN_SOURCE=700" API_FLAGS)
# C
unset(C_STANDARD_FLAGS)
set(CMAKE_C_EXTENSIONS OFF)
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(C_STANDARD_FLAGS "${CMAKE_C_FLAGS_DEFAULT} ${CMAKE_C${CMAKE_C_STANDARD}_STANDARD_COMPILE_OPTION} ${API_FLAGS}")
string(STRIP "${C_STANDARD_FLAGS}" C_STANDARD_FLAGS)
# C++
unset(CXX_STANDARD_FLAGS)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CXX_STANDARD_FLAGS "${CMAKE_CXX_FLAGS_DEFAULT} ${CMAKE_CXX${CMAKE_CXX_STANDARD}_STANDARD_COMPILE_OPTION} ${API_FLAGS}")
string(STRIP "${CXX_STANDARD_FLAGS}" CXX_STANDARD_FLAGS)
#---------------------------------------------------------------------
# We will need a brlcad_config.h.in file to hold all the #cmakedefine
# statements, which will in turn be used to generate a brlcad_conf.h
# file. In autotools this process is handled by autoheader - in the
# case of CMake we wrap the CHECK_* functions and the creation of the
# entry in the brlcad_config.h.in file into one step via a macro.
#
# To avoid hitting the disk I/O any harder than necessary, we store
# the eventual contents of brlcad_config.h.in as a CMake string until
# it is ready to process. A global property is needed to hold the
# contents, because subdirectories (in particular, src/other) may
# have content to contribute to the top level config.h.in file and
# the default local variable scope in subdirectories means those
# changes would not automatically propagate back up.
#
# We also allow for multiple projects with this macro, in case
# subprojects are also managing a config.h.in a file of their own.
set(CONFIG_H_FILE "${BRLCAD_BINARY_DIR}/include/brlcad_config.h.in")
set(CMAKE_CURRENT_PROJECT BRLCAD)
define_property(GLOBAL PROPERTY BRLCAD_CONFIG_H_CONTENTS BRIEF_DOCS "config.h.in contents" FULL_DOCS "config.h.in contents for BRL-CAD project")
if(NOT COMMAND CONFIG_H_APPEND)
function(CONFIG_H_APPEND PROJECT_NAME NEW_CONTENTS)
if(PROJECT_NAME)
get_property(${PROJECT_NAME}_CONFIG_H_CONTENTS GLOBAL PROPERTY ${PROJECT_NAME}_CONFIG_H_CONTENTS)
set(${PROJECT_NAME}_CONFIG_H_FILE_CONTENTS "${${PROJECT_NAME}_CONFIG_H_CONTENTS}${NEW_CONTENTS}")
set_property(GLOBAL PROPERTY ${PROJECT_NAME}_CONFIG_H_CONTENTS "${${PROJECT_NAME}_CONFIG_H_FILE_CONTENTS}")
endif(PROJECT_NAME)
endfunction(CONFIG_H_APPEND NEW_CONTENTS)
endif(NOT COMMAND CONFIG_H_APPEND)
CONFIG_H_APPEND(BRLCAD "/**** Define statements for CMake ****/\n")
CONFIG_H_APPEND(BRLCAD "#if !defined(BRLCADBUILD)\n")
CONFIG_H_APPEND(BRLCAD " # pragma message \"Warning: included brlcad_config.h (compile-time API) without BRLCADBUILD defined\"\n")
CONFIG_H_APPEND(BRLCAD "#endif\n")
CONFIG_H_APPEND(BRLCAD "#if !defined(HAVE_CONFIG_H)\n")
CONFIG_H_APPEND(BRLCAD " # pragma message \"Warning: included brlcad_config.h (compile-time API) without HAVE_CONFIG_H defined\"\n")
CONFIG_H_APPEND(BRLCAD "#endif\n")
CONFIG_H_APPEND(BRLCAD "#ifndef __CONFIG_H__\n")
CONFIG_H_APPEND(BRLCAD "#define __CONFIG_H__\n")
# Set up some of the define statements for path information and other basics
CONFIG_H_APPEND(BRLCAD "#define PACKAGE \"brlcad\"\n")
CONFIG_H_APPEND(BRLCAD "#define PACKAGE_BUGREPORT \"https://brlcad.org\"\n")
CONFIG_H_APPEND(BRLCAD "#define PACKAGE_NAME \"BRL-CAD\"\n")
CONFIG_H_APPEND(BRLCAD "#define PACKAGE_STRING \"BRL-CAD ${BRLCAD_VERSION}\"\n")
CONFIG_H_APPEND(BRLCAD "#define PACKAGE_TARNAME \"brlcad\"\n")
# Let programs know what the executable suffix and lib suffix are on this platform, if any
CONFIG_H_APPEND(BRLCAD "#define EXECUTABLE_SUFFIX \"${CMAKE_EXECUTABLE_SUFFIX}\"\n")
CONFIG_H_APPEND(BRLCAD "#define SHARED_LIBRARY_SUFFIX \"${CMAKE_SHARED_LIBRARY_SUFFIX}\"\n")
# Let bu_dir know what the target install directory is. In a superbuild
# configuration this will be the most import place to be sure that we get the
# actual superbuild install path, not the local BRL-CAD subbuild install path.
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_ROOT \"${CMAKE_INSTALL_PREFIX}\"\n")
# Define the various relative paths for bu_dir (be sure to have included
# Path_Setup.cmake before this point, as that file defines these variables.)
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_BIN_DIR \"${BIN_DIR}\"\n")
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_LIB_DIR \"${LIB_DIR}\"\n")
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_LIBEXEC_DIR \"${LIBEXEC_DIR}\"\n")
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_INCLUDE_DIR \"${INCLUDE_DIR}\"\n")
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_DATA_DIR \"${DATA_DIR}\"\n")
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_DOC_DIR \"${DOC_DIR}\"\n")
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_MAN_DIR \"${MAN_DIR}\"\n")
# Define the ammendment count if we have one
if(DEFINED BRLCAD_VERSION_AMEND)
CONFIG_H_APPEND(BRLCAD "#define BRLCAD_VERSION_AMEND ${BRLCAD_VERSION_AMEND}\n")
endif(DEFINED BRLCAD_VERSION_AMEND)
#----------------------------------------------------------------------
# If we're not debugging, we want HIDDEN to be defined as static. Set
# the NDEBUG flag accordingly, and common.h will take it from there.
# Don't set this if we're doing multi-config, since whether we want
# this on is not ultimately decided at configure time.
if(NOT "${CMAKE_BUILD_TYPE}" STREQUAL "Debug" AND NOT CMAKE_CONFIGURATION_TYPES)
CONFIG_H_APPEND(BRLCAD "#define NDEBUG 1\n")
endif(NOT "${CMAKE_BUILD_TYPE}" STREQUAL "Debug" AND NOT CMAKE_CONFIGURATION_TYPES)
#----------------------------------------------------------------------
# Let config.h know whether we're doing a 32 or a 64 bit build.
CONFIG_H_APPEND(BRLCAD "#define SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P}\n")
# OpenBSD doesn't define __WORD_SIZE
if(${CMAKE_WORD_SIZE} MATCHES "32BIT")
CONFIG_H_APPEND(BRLCAD "#ifndef __WORDSIZE\n# define __WORDSIZE 32\n#endif\n")
endif(${CMAKE_WORD_SIZE} MATCHES "32BIT")
if(${CMAKE_WORD_SIZE} MATCHES "64BIT")
CONFIG_H_APPEND(BRLCAD "#ifndef __WORDSIZE\n# define __WORDSIZE 64\n#endif\n")
endif(${CMAKE_WORD_SIZE} MATCHES "64BIT")
# Auto-reconfiguration - by default, a CMake generated build system
# will re-run CMake if it detects that build system logic has changed.
# This is normally a good thing, but becomes problematic when using
# Visual Studio - recent versions of MSVC will individually prompt for
# a re-loading of generated solution files one at a time. Since
# BRL-CAD has over a thousand such files in a default build, the only
# viable approach is to close Visual Studio, re-run CMake manually,
# and re-open the project in Visual Studio.
if("${CMAKE_GENERATOR}" MATCHES "Visual Studio")
set(CMAKE_SUPPRESS_REGENERATION ON)
endif("${CMAKE_GENERATOR}" MATCHES "Visual Studio")
# *******************************************************************
if(BRLCAD_PRINT_MSGS)
message("***********************************************************")
message("* Stage 1 of 9 - Top Level Configure Options *")
message("***********************************************************")
endif(BRLCAD_PRINT_MSGS)
# The BRL-CAD CMake build will also generate a configure script
# that emulates the command option style of GNU Autotool's
# configure. Write the pre-defined header into the build-dir template
# to initialize the file.
file(REMOVE "${CMAKE_BINARY_DIR}/configure.new")
file(READ "${BRLCAD_CMAKE_DIR}/configure_prefix.sh" CONFIG_PREFIX)
file(WRITE "${CMAKE_BINARY_DIR}/configure.new.tmp" "${CONFIG_PREFIX}")
file(COPY "${CMAKE_BINARY_DIR}/configure.new.tmp" DESTINATION
"${CMAKE_BINARY_DIR}/CMakeFiles" FILE_PERMISSIONS OWNER_READ OWNER_WRITE
OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
file(REMOVE "${CMAKE_BINARY_DIR}/configure.new.tmp")
file(RENAME "${CMAKE_BINARY_DIR}/CMakeFiles/configure.new.tmp"
"${CMAKE_BINARY_DIR}/configure.new")
include(BRLCAD_User_Options)
# *******************************************************************
if(BRLCAD_PRINT_MSGS)
message("***********************************************************")
message("* Stage 2 of 9 - Check for Programs *")
message("***********************************************************")
endif(BRLCAD_PRINT_MSGS)
# Load various wrapper macros for checking libraries, headers and
# functions, some in use by src/other build logic
include(BRLCAD_CheckFunctions)
# Load Doxygen related CMake macros
include(Doxygen)
# A variety of tools, such as the benchmark utilities, need
# a Bourne shell and other commands - check for them.
include(FindShellDeps)
# If using dtrace, we will need to find it
if(BRLCAD_ENABLE_DTRACE)
find_program(DTRACE_EXEC NAMES dtrace DOC "path to dtrace executable")
endif(BRLCAD_ENABLE_DTRACE)
# SWIG is an automatic generator of wrappers for various
# software languages
find_package(SWIG)
mark_as_advanced(SWIG_EXECUTABLE)
mark_as_advanced(SWIG_DIR)
mark_as_advanced(SWIG_VERSION)
# Doxygen is a tool for generating formatted documentation
# from structured source code comments.
find_package(Doxygen)
# *******************************************************************
if(BRLCAD_PRINT_MSGS)
message("***********************************************************")
message("* Stage 3 of 9 - Check for Compiler Characteristics *")
message("***********************************************************")
endif(BRLCAD_PRINT_MSGS)
# TODO - the Ninja single config generator in Release build uses the O3
# and other optimization flags, but they don't seem to make it to the
# step-g sources in MultiConfig release build???
# load our compiler testing macro definitions
include(CompilerFlags)
# Cache the original CMake sets of build flags for later use
if(NOT CMAKE_BUILD_FLAGS_CACHED_CMAKE_DEFAULT)
CACHE_BUILD_FLAGS(_CMAKE_DEFAULT)
endif(NOT CMAKE_BUILD_FLAGS_CACHED_CMAKE_DEFAULT)
# Clear out most CMake-assigned defaults - We're managing
# our own compile flags, and don't (for example) want NDEBUG
# if we have debugging flags enabled for a Release build.
# At the same time, pull in any flags that have been set
# in the environment.
CLEAR_BUILD_FLAGS()
# Since this isn't src/other or misc/tools, we want the standards set.
set(CMAKE_C_FLAGS "${C_STANDARD_FLAGS}")
set(CMAKE_CXX_FLAGS "${CXX_STANDARD_FLAGS}")
# try to use -pipe to speed up the compiles
CHECK_C_FLAG(pipe)
CHECK_CXX_FLAG(pipe)
# Enable visibility restrictions. We have to deal with this on Windows, so
# enable it wherever we can to keep the code working across all platforms.
CHECK_C_FLAG(fvisibility=hidden)
CHECK_CXX_FLAG(fvisibility=hidden)
# If we can, hide internal library symbols
if(FVISIBILITY_HIDDEN_CXX_FLAG_FOUND)
set(HIDE_INTERNAL_SYMBOLS 1)
endif(FVISIBILITY_HIDDEN_CXX_FLAG_FOUND)
if(MSVC)
# On platforms other than MSVC, the hidden symbols are a convenience and may
# not be supported by system lib headers. With Visual Studio, they are a
# necessity - define an extra flag so we know to always set them in that
# case in order to properly link against the system libs.
set(HIDE_INTERNAL_SYMBOLS 1)
set(HIDE_INTERNAL_SYMBOLS_EXT 1)
endif(MSVC)
# check for -fno-strict-aliasing
# XXX - THIS FLAG IS REQUIRED if any level of optimization is
# enabled with GCC as we do use aliasing and type-punning.
CHECK_C_FLAG(fno-strict-aliasing)
CHECK_CXX_FLAG(fno-strict-aliasing)
# check for -fno-common (libtcl needs it on darwin)
CHECK_C_FLAG(fno-common)
CHECK_CXX_FLAG(fno-common)
# check for -fexceptions
# this is needed to resolve __Unwind_Resume when compiling and
# linking against openNURBS in librt for any -static binaries
CHECK_C_FLAG(fexceptions)
CHECK_CXX_FLAG(fexceptions)
# check for -ftemplate-depth-NN this is needed in libpc and
# other code using boost where the template instantiation depth
# needs to be increased from the default ANSI minimum of 17.
CHECK_CXX_FLAG(ftemplate-depth-128)
# check for llvm libFuzzer support
CHECK_CXX_FLAG(fsanitize=fuzzer)
# dynamic SSE optimizations for NURBS processing
#
# XXX disable the SSE flags for now as they can cause illegal instructions.
# the test needs to also be tied to run-time functionality since gcc
# may still output SSE instructions (e.g., for cross-compiling).
# CHECK_C_FLAG(msse)
# CHECK_C_FLAG(msse2)
# CHECK_C_FLAG(msse3)
# TODO - should be using this with MSVC, but it breaks the BUILD_SLEEP
# try_compile below with errors that appear to be coming from Windows
# headers??
# CHECK_C_FLAG("Za")
# 64bit compilation flags
if(${CMAKE_WORD_SIZE} MATCHES "64BIT" AND NOT CMAKE_CL_64)
CHECK_C_FLAG(m64 VARS 64BIT_FLAG)
CHECK_C_FLAG("arch x86_64" VARS 64BIT_FLAG)
CHECK_C_FLAG(64 VARS 64BIT_FLAG)
CHECK_C_FLAG("mabi=64" VARS 64BIT_FLAG)
if(NOT 64BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "64BIT")
message(FATAL_ERROR "Trying to compile 64BIT but all 64 bit compiler flag tests failed!")
endif(NOT 64BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "64BIT")
CHECK_C_FLAG(q64 VARS 64BIT_FLAG)
ADD_NEW_FLAG(C 64BIT_FLAG ALL)
ADD_NEW_FLAG(CXX 64BIT_FLAG ALL)
ADD_NEW_FLAG(SHARED_LINKER 64BIT_FLAG ALL)
ADD_NEW_FLAG(EXE_LINKER 64BIT_FLAG ALL)
endif(${CMAKE_WORD_SIZE} MATCHES "64BIT" AND NOT CMAKE_CL_64)
# 32 bit compilation flags
if(${CMAKE_WORD_SIZE} MATCHES "32BIT" AND NOT ${BRLCAD_WORD_SIZE} MATCHES "AUTO" AND NOT MSVC)
CHECK_C_FLAG(m32 VARS 32BIT_FLAG)
CHECK_C_FLAG("arch i686" VARS 32BIT_FLAG)
CHECK_C_FLAG(32 VARS 32BIT_FLAG)
CHECK_C_FLAG("mabi=32" VARS 32BIT_FLAG)
CHECK_C_FLAG(q32 VARS 32BIT_FLAG)
if(NOT 32BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "32BIT")
message(FATAL_ERROR "Trying to compile 32BIT but all 32 bit compiler flag tests failed!")
endif(NOT 32BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "32BIT")
ADD_NEW_FLAG(C 32BIT_FLAG ALL)
ADD_NEW_FLAG(CXX 32BIT_FLAG ALL)
ADD_NEW_FLAG(SHARED_LINKER 32BIT_FLAG ALL)
ADD_NEW_FLAG(EXE_LINKER 32BIT_FLAG ALL)
endif(${CMAKE_WORD_SIZE} MATCHES "32BIT" AND NOT ${BRLCAD_WORD_SIZE} MATCHES "AUTO" AND NOT MSVC)
# Debugging flags
if(BRLCAD_FLAGS_DEBUG)
CHECK_C_FLAG(g GROUPS DEBUG_C_FLAGS)
CHECK_CXX_FLAG(g GROUPS DEBUG_CXX_FLAGS)
if(APPLE)
EXEC_PROGRAM(sw_vers ARGS -productVersion OUTPUT_VARIABLE MACOSX_VERSION)
if(${MACOSX_VERSION} VERSION_LESS "10.5")
CHECK_C_FLAG(ggdb3 GROUPS DEBUG_C_FLAGS)
CHECK_CXX_FLAG(ggdb3 GROUPS DEBUG_CXX_FLAGS)
else(${MACOSX_VERSION} VERSION_LESS "10.5")
# CHECK_C_COMPILER_FLAG silently eats gstabs+ - also, compiler
# apparently doesn't like mixing stabs with another debug flag.
set(DEBUG_C_FLAGS "-ggdb")
set(DEBUG_CXX_FLAGS "-ggdb")
endif(${MACOSX_VERSION} VERSION_LESS "10.5")
else(APPLE)
CHECK_C_FLAG(ggdb3 GROUPS DEBUG_C_FLAGS)
CHECK_CXX_FLAG(ggdb3 GROUPS DEBUG_CXX_FLAGS)
endif(APPLE)
if(CMAKE_CONFIGURATION_TYPES)
set(debug_config_list "${CMAKE_CONFIGURATION_TYPES}")
else(CMAKE_CONFIGURATION_TYPES)
set(debug_config_list "ALL")
endif(CMAKE_CONFIGURATION_TYPES)
ADD_NEW_FLAG(C DEBUG_C_FLAGS "${debug_config_list}")
ADD_NEW_FLAG(CXX DEBUG_CXX_FLAGS "${debug_config_list}")
# TODO - need to figure out a way to actually test linker flags
ADD_NEW_FLAG(SHARED_LINKER DEBUG_C_FLAGS "${debug_config_list}")
ADD_NEW_FLAG(EXE_LINKER DEBUG_C_FLAGS "${debug_config_list}")
mark_as_advanced(DEBUG_FLAGS)
endif(BRLCAD_FLAGS_DEBUG)
# Warn if no minimum compilation linkage is set for Mac systems
if(APPLE AND "${CMAKE_BUILD_TYPE}" STREQUAL "Release" AND "$ENV{MACOSX_DEPLOYMENT_TARGET}" STREQUAL "")
message(WARNING "}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}\nMACOSX_DEPLOYMENT_TARGET should be set for release builds\nto something less than the latest release for portability\ne.g., export MACOSX_DEPLOYMENT_TARGET=10.5\nSee https://github.com/brlcad/MacOSX-SDKs\n}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}")
endif(APPLE AND "${CMAKE_BUILD_TYPE}" STREQUAL "Release" AND "$ENV{MACOSX_DEPLOYMENT_TARGET}" STREQUAL "")
# Most of the src/other projects have their own logic for handling
# the C inline issue - BRL-CAD needs a fine-grained approach. Mixed
# C and C++ sources require different treatment for the same build
# target, since C++11 doesn't allow inline to be re-defined. See
# misc/CMake/BRLCAD_Targets.cmake for handling of C_INLINE.
CHECK_C_INLINE(C_INLINE)
if(NOT HAVE_INLINE_KEYWORD AND HAVE___INLINE_KEYWORD)
CONFIG_H_APPEND(BRLCAD "#ifndef __cplusplus\n")
CONFIG_H_APPEND(BRLCAD "# define inline __inline\n")
CONFIG_H_APPEND(BRLCAD "#endif /* !__cplusplus */\n")
elseif(HAVE_INLINE_KEYWORD)
# this ugly hack is to avoid broken Mac OS X (10.13 era) ctype
# headers that drop the inline keyword when compiling c99.
CONFIG_H_APPEND(BRLCAD "#if !defined(inline) && !defined(__cplusplus)\n")
CONFIG_H_APPEND(BRLCAD "# define inline inline\n")
CONFIG_H_APPEND(BRLCAD "#endif /* !inline && !__cplusplus */\n")
endif(NOT HAVE_INLINE_KEYWORD AND HAVE___INLINE_KEYWORD)
# If doing an optimized build, set _FORTIFY_SOURCE to 2. Provides
# compile-time best-practice error checking on certain libc functions
# (e.g., memcpy), and provides run-time checks on buffer lengths and
# memory regions. Unfortunately, glibc-1.6 made _FORTIFY_SOURCE spew
# an unquellable warning if optimization is disabled so we can't tie
# the flag to debug builds.
if(${BRLCAD_OPTIMIZED_BUILD} MATCHES "ON")
CONFIG_H_APPEND(BRLCAD "#ifndef _FORTIFY_SOURCE\n# define _FORTIFY_SOURCE 2\n#endif\n")
endif(${BRLCAD_OPTIMIZED_BUILD} MATCHES "ON")
# Enable this flag for additional reporting of undefined symbols.
# TODO: Fixing these is a work in progress.
# CHECK_C_COMPILER_FLAG("Wl,--no-undefined" NO_UNDEFINED_LINKER_FLAG)
# ******************************************************************* #
# For some tests, we need Werror to make sure the test actually fails
# TODO - replace this cache approach with the CMakePushCheckState module
set(CMAKE_REQUIRED_FLAGS_BAK ${CMAKE_REQUIRED_FLAGS})
CHECK_C_FLAG(Werror VARS ERROR_FLAG)
if (ERROR_FLAG)
set(CMAKE_REQUIRED_FLAGS "-Werror")
endif (ERROR_FLAG)
# Check whether the compiler supports __attribute__((format (__printf__, 1, 2)))
check_c_source_compiles("int pf(const char *f, ...) __attribute__((format (__printf__, 1, 2))); int pf(const char *f, ...){return 1;} int main(int argc, char *argv[]) {return pf(\"%c\",'a');}" HAVE_PRINTF12_ATTRIBUTE)
if(HAVE_PRINTF12_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_PRINTF12_ATTRIBUTE 1\n")
endif(HAVE_PRINTF12_ATTRIBUTE)
# Check whether the compiler supports __attribute__((format (__printf__, 2, 3)))
check_c_source_compiles("int pf(void *o, const char *f, ...) __attribute__((format (__printf__, 2, 3))); int pf(void *o, const char *f, ...){return 1;} int main(int argc, char *argv[]) {return pf((void *)0, \"%c\",'a');}" HAVE_PRINTF23_ATTRIBUTE)
if(HAVE_PRINTF23_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_PRINTF23_ATTRIBUTE 1\n")
endif(HAVE_PRINTF23_ATTRIBUTE)
# Check whether the compiler supports __attribute__((format (__scanf__, 2, 3)))
check_c_source_compiles("int sf(void *o, const char *f, ...) __attribute__((format (__scanf__, 2, 3))); int sf(void *o, const char *f, ...){return 1;} int main(int argc, char *argv[]) {int i = 1; return sf((void *)0, \"%d\", &i);}" HAVE_SCANF23_ATTRIBUTE)
if(HAVE_SCANF23_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_SCANF23_ATTRIBUTE 1\n")
endif(HAVE_SCANF23_ATTRIBUTE)
include(CheckCSourceCompiles)
# Check whether the compiler supports __attribute__((__noreturn__))
check_c_source_compiles("#include <stdlib.h>\n
void noret() __attribute__((__noreturn__)); void noret(){exit(1);} int main(int argc, char *argv[]) {noret(); return 0;}" HAVE_NORETURN_ATTRIBUTE)
if(HAVE_NORETURN_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_NORETURN_ATTRIBUTE 1\n")
endif(HAVE_NORETURN_ATTRIBUTE)
# Check whether the compiler supports __attribute__((analyzer_noreturn))
check_c_source_compiles("void anoret() __attribute__((analyzer_noreturn)); void anoret(){return;} int main(int argc, char *argv[]) {anoret(); return 0;}" HAVE_ANALYZER_NORETURN_ATTRIBUTE)
if(HAVE_ANALYZER_NORETURN_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_ANALYZER_NORETURN_ATTRIBUTE 1\n")
endif(HAVE_ANALYZER_NORETURN_ATTRIBUTE)
# Check whether the compiler supports __attribute__((always_inline))
check_c_source_compiles("inline void always_inline() __attribute__((always_inline)); inline void always_inline(){return;} int main(int argc, char *argv[]) {always_inline(); return 0;}" HAVE_ALWAYS_INLINE_ATTRIBUTE)
if(HAVE_ALWAYS_INLINE_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_ALWAYS_INLINE_ATTRIBUTE 1\n")
endif(HAVE_ALWAYS_INLINE_ATTRIBUTE)
# Check whether the compiler supports __attribute__((const))
check_c_source_compiles("void func() __attribute__((const)); void func(){return;} int main(int argc, char *argv[]) {func(); return 0;}" HAVE_CONST_ATTRIBUTE)
if(HAVE_CONST_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_CONST_ATTRIBUTE 1\n")
endif(HAVE_CONST_ATTRIBUTE)
# Check whether the compiler supports __attribute__((pure))
check_c_source_compiles("void func() __attribute__((pure)); void func(){return;} int main(int argc, char *argv[]) {func(); return 0;}" HAVE_PURE_ATTRIBUTE)
if(HAVE_PURE_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_PURE_ATTRIBUTE 1\n")
endif(HAVE_PURE_ATTRIBUTE)
# Check whether the compiler supports __attribute__((cold))
check_c_source_compiles("void func() __attribute__((cold)); void func(){return;} int main(int argc, char *argv[]) {func(); return 0;}" HAVE_COLD_ATTRIBUTE)
if(HAVE_COLD_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_COLD_ATTRIBUTE 1\n")
endif(HAVE_COLD_ATTRIBUTE)
# Check whether the compiler supports __attribute__((nonnull))
check_c_source_compiles("int *func(int *) __attribute__((nonnull)); int *func(int *v){(*v)-=1; return v;} int main(int argc, char *argv[]) {int v = 1; int *vp = func(&v); return *vp;}" HAVE_NONNULL_ATTRIBUTE)
if(HAVE_NONNULL_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_NONNULL_ATTRIBUTE 1\n")
endif(HAVE_NONNULL_ATTRIBUTE)
# Check whether the compiler supports __attribute__((warn_unused_result))
check_c_source_compiles("int *func(int *) __attribute__((warn_unused_result)); int *func(int *v){(*v)-=1; return v;} int main(int argc, char *argv[]) {int v = 1; int *vp = func(&v); return *vp;}" HAVE_WARN_UNUSED_RESULT_ATTRIBUTE)
if(HAVE_WARN_UNUSED_RESULT_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_WARN_UNUSED_RESULT_ATTRIBUTE 1\n")
endif(HAVE_WARN_UNUSED_RESULT_ATTRIBUTE)
# Check whether the compiler supports __attribute__((flatten))
check_c_source_compiles("__attribute__((flatten)) int *func(int *v){(*v)-=1; return v;} __attribute((flatten)) int main(int argc, char *argv[]) {int v = 1; int *vp = func(&v); return *vp;}" HAVE_FLATTEN_ATTRIBUTE)
if(HAVE_FLATTEN_ATTRIBUTE)
CONFIG_H_APPEND(BRLCAD "#define HAVE_FLATTEN_ATTRIBUTE 1\n")
endif(HAVE_FLATTEN_ATTRIBUTE)
# Silence check for unused arguments (used to silence clang warnings about
# unused options on the command line). By default clang generates a lot of
# warnings about such arguments, and we don't really care.
CHECK_C_FLAG(Qunused-arguments)
CHECK_CXX_FLAG(Qunused-arguments)
set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_BAK})
# The following tests are almost entirely for gcc/llvm style flags, so
# we don't unnecessarily slow down the Windows build.
if(NOT MSVC)
# This is nominally a header test, but because it can impact the C/C++ flags
# we do it before the final caching of BRL-CAD flags. We need this because
# pthread headers on some BSD platforms still haven't been scrubbed for
# c90/posix.1 compliance - see r70785
BRLCAD_INCLUDE_FILE(pthread.h PROBE_PTHREAD_H)
if (NOT PROBE_PTHREAD_H)
cmake_push_check_state(RESET)
# pthread.h on FreeBSD 10 and some older Linucies use non-c90 types
set(CMAKE_REQUIRED_DEFINITIONS "-Dclockid_t=clock_t")
set(CMAKE_REQUIRED_FLAGS "-pthread")
BRLCAD_INCLUDE_FILE(pthread.h PROBE_PTHREAD_H_CLOCKID_T)
if (PROBE_PTHREAD_H_CLOCKID_T)
set(C_STANDARD_FLAGS "${C_STANDARD_FLAGS} -Dclockid_t=clock_t -pthread")
set(CXX_STANDARD_FLAGS "${CXX_STANDARD_FLAGS} -Dclockid_t=clock_t -pthread")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Dclockid_t=clock_t -pthread")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Dclockid_t=clock_t -pthread")
endif (PROBE_PTHREAD_H_CLOCKID_T)
endif (NOT PROBE_PTHREAD_H)
# -O3/-Ofast can enable -ffast-math which can provoke a stack
# corruption in the shadow computations because of strict aliasing
# getting enabled. we _require_ -fno-strict-aliasing until someone
# changes how lists are managed. -fast-math results in non-IEEE
# floating point math among a handful of other optimizations that
# cause substantial error in ray tracing and tessellation (and
# probably more).
CHECK_C_FLAG(O3 GROUPS OPTIMIZE_C_FLAGS)
CHECK_CXX_FLAG(O3 GROUPS OPTIMIZE_CXX_FLAGS)
# goes a step beyond O3, possibly using dangerous imprecise math
# CHECK_C_FLAG(Ofast GROUPS OPTIMIZE_C_FLAGS)
# CHECK_CXX_FLAG(Ofast GROUPS OPTIMIZE_CXX_FLAGS)
# binaries will not necessarily work on a different machine
# CHECK_C_FLAG(march=native GROUPS OPTIMIZE_C_FLAGS)
# CHECK_CXX_FLAG(march=native GROUPS OPTIMIZE_CXX_FLAGS)
# perform interprocedural analysis, slows compilation heavily
CHECK_C_FLAG(fipa-pta GROUPS OPTIMIZE_C_FLAGS)
CHECK_CXX_FLAG(fipa-pta GROUPS OPTIMIZE_CXX_FLAGS)
# enabled at -O2, but not in older compilers
CHECK_C_FLAG(fstrength-reduce GROUPS OPTIMIZE_C_FLAGS)
CHECK_CXX_FLAG(fstrength-reduce GROUPS OPTIMIZE_CXX_FLAGS)
# enabled at -O2, but not in older compilers
CHECK_C_FLAG(fexpensive-optimizations GROUPS OPTIMIZE_C_FLAGS)
CHECK_CXX_FLAG(fexpensive-optimizations GROUPS OPTIMIZE_CXX_FLAGS)
# enabled at -O3, but not in older compilers
CHECK_C_FLAG(finline-functions GROUPS OPTIMIZE_C_FLAGS)
CHECK_CXX_FLAG(finline-functions GROUPS OPTIMIZE_CXX_FLAGS)
# Profile-Guided Optimization -- this requires a two-pass compile,
# with BRLCAD_PGO=ON and (optionally) the PGO_PATH environment
# variable set to a temp folder
set(pgo_flags_found "")
if("$ENV{PGO_PATH}" STREQUAL "")
set(BRLCAD_PGO_PATH "${CMAKE_BINARY_DIR}/profiling")
else(NOT "$ENV{PGO_PATH}" STREQUAL "")
set(BRLCAD_PGO_PATH "$ENV{PGO_PATH}")
endif("$ENV{PGO_PATH}" STREQUAL "")
if(BRLCAD_PGO AND NOT EXISTS "${BRLCAD_PGO_PATH}")
if("${CMAKE_C_FLAGS}" MATCHES ".*fprofile-use.*")
message(FATAL_ERROR "PGO path ${BRLCAD_PGO_PATH} does not exist, but C flags contain the -fprofile-use flag. This probably means you need to remove a stale CMakeCache.txt file to clear the build flags before performing the first pass of the PGO compilation.\n")
endif("${CMAKE_C_FLAGS}" MATCHES ".*fprofile-use.*")
# gcc-style GEN
if("${pgo_flags_found}" STREQUAL "")
cmake_push_check_state()
set(flags "fprofile-generate=\"${BRLCAD_PGO_PATH}\" -Wno-error=coverage-mismatch -fprofile-correction")
set(CMAKE_REQUIRED_FLAGS "-${flags}")
CHECK_C_FLAG("${flags}" GROUPS OPTIMIZE_C_FLAGS VARS pgo_flags_found)
CHECK_CXX_FLAG("${flags}" GROUPS OPTIMIZE_CXX_FLAGS)
cmake_pop_check_state()
endif("${pgo_flags_found}" STREQUAL "")
# llvm-style GEN
if("${pgo_flags_found}" STREQUAL "")
cmake_push_check_state()
set(flags "fprofile-generate=\"${BRLCAD_PGO_PATH}\"")
set(CMAKE_REQUIRED_FLAGS "-${flags}")
CHECK_C_FLAG("${flags}" GROUPS OPTIMIZE_C_FLAGS VARS pgo_flags_found)
CHECK_CXX_FLAG("${flags}" GROUPS OPTIMIZE_CXX_FLAGS)
cmake_pop_check_state()
endif("${pgo_flags_found}" STREQUAL "")
if(NOT "${pgo_flags_found}" STREQUAL "")
DISTCLEAN(${BRLCAD_PGO_PATH})
endif(NOT "${pgo_flags_found}" STREQUAL "")
elseif(BRLCAD_PGO AND EXISTS "${BRLCAD_PGO_PATH}")
if(CMAKE_C_FLAGS)
if("${CMAKE_C_FLAGS}" MATCHES ".*fprofile-generate.*")
message(FATAL_ERROR "PGO path ${BRLCAD_PGO_PATH} exists, but C flags contain the -fprofile-generate flag. This probably means you need to remove a stale CMakeCache.txt file to clear the build flags before performing the second pass of the PGO compilation.\n")
endif("${CMAKE_C_FLAGS}" MATCHES ".*fprofile-generate.*")
endif(CMAKE_C_FLAGS)
# gcc-style USE
if("${pgo_flags_found}" STREQUAL "")
cmake_push_check_state()
set(flags "fprofile-use=\"${BRLCAD_PGO_PATH}\" -Wno-error=coverage-mismatch -fprofile-correction")
set(CMAKE_REQUIRED_FLAGS "-${flags}")
CHECK_C_FLAG("${flags}" GROUPS OPTIMIZE_C_FLAGS VARS pgo_flags_found)
CHECK_CXX_FLAG("${flags}" GROUPS OPTIMIZE_CXX_FLAGS)
cmake_pop_check_state()
endif("${pgo_flags_found}" STREQUAL "")
# llvm-style USE
if("${pgo_flags_found}" STREQUAL "")
cmake_push_check_state()
set(flags "fprofile-use=\"${BRLCAD_PGO_PATH}\" -Wno-profile-instr-out-of-date -Wno-profile-instr-unprofiled")
set(CMAKE_REQUIRED_FLAGS "-${flags}")
CHECK_C_FLAG("${flags}" GROUPS OPTIMIZE_C_FLAGS VARS pgo_flags_found)
CHECK_CXX_FLAG("${flags}" GROUPS OPTIMIZE_CXX_FLAGS)
cmake_pop_check_state()
endif("${pgo_flags_found}" STREQUAL "")
endif(BRLCAD_PGO AND NOT EXISTS "${BRLCAD_PGO_PATH}")
# CHECK_C_FLAG("finline-limit=10000 --param inline-unit-growth=300 --param large-function-growth=300" GROUPS OPTIMIZE_C_FLAGS)
# CHECK_CXX_FLAG("finline-limit=10000 --param inline-unit-growth=300 --param large-function-growth=300" GROUPS OPTIMIZE_CXX_FLAGS)
# link-time optimization (LTO) results in slower linking, more
# warnings, and better optimization, but requires newer versions of
# compilers to avoid common bugs.
if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS 4.9)
# LTO bug in GCC 4.8.5 (__fread_chk_warn)
else ()
CHECK_C_FLAG(flto GROUPS OPTIMIZE_C_FLAGS)
CHECK_CXX_FLAG(flto GROUPS OPTIMIZE_CXX_FLAGS)
# When compiling with O3 + flto, GCC 6.3 (e.g. on Debian x64, and maybe
# others, but I haven't tested) fails to link executables using libbrep.
# See also: https://sourceforge.net/p/brlcad/discussion/362510/thread/676f80ce/
#
# The problem is that openNURBS' ~ON_SimpleArray virtual destructor (used by
# ON_3dPointArray, for example) ends up having local binding in libbrep.so.
# Then, when code calling it (by delete'ing an object) has to be linked, it
# results in the error seen in the discussion thread above. libbrep.so's
# entry for the destructor has the bogus value that is outside bounds,
# causing the error in the thread.
#
# I don't know what tool causes the error (the compiler? the linker? ar?
# ranlib?), and I don't know if it's a bug in the tool or in
# libbrep/libOPENNUBRS, but finline-small-functions (activated by GCC at O2
# and above) causes openNURBS' ~ON_SimpleArray virtual destructor to have
# proper (weak) binding, allowing compilation to proceed.
#
# Going back through the commits, compilation started to fail after r70631,
# which switched to C++98 from C++11.
#
# CHECK_CXX_FLAG(fno-inline-small-functions GROUPS OPTIMIZE_CXX_FLAGS)
endif ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS 4.9)
# GCC 4.9+ introduced "thin" LTO object files that require special
# ar/ranlib handling via wrappers or plugin specification. These
# wrappers work fine even if we're not using LTO, so just use them
# if found.
if (CMAKE_C_COMPILER_ID MATCHES "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.8)
find_program(GCC_AR_LTO ${CMAKE_C_COMPILER}-ar NAMES gcc-ar DOC "GNU ARchiver wrapper with LTO support")
if (GCC_AR_LTO)
SET(CMAKE_AR "${GCC_AR_LTO}" CACHE FILEPATH "Archiver" FORCE)
endif (GCC_AR_LTO)