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extconf.rb
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extconf.rb
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# frozen_string_literal: true
# re2 (https://github.com/mudge/re2)
# Ruby bindings to RE2, a "fast, safe, thread-friendly alternative to
# backtracking regular expression engines like those used in PCRE, Perl, and
# Python".
#
# Copyright (c) 2010, Paul Mucur (https://mudge.name)
# Released under the BSD Licence, please see LICENSE.txt
require 'mkmf'
require_relative 'recipes'
module RE2
class Extconf
def configure
configure_cross_compiler
if config_system_libraries?
build_with_system_libraries
else
build_with_vendored_libraries
end
build_extension
create_makefile("re2")
end
def print_help
print(<<~TEXT)
USAGE: ruby #{$0} [options]
Flags that are always valid:
--enable-system-libraries
Use system libraries instead of building and using the packaged libraries.
--disable-system-libraries
Use the packaged libraries, and ignore the system libraries. This is the default.
Flags only used when using system libraries:
Related to re2 library:
--with-re2-dir=DIRECTORY
Look for re2 headers and library in DIRECTORY.
Flags only used when building and using the packaged libraries:
--enable-cross-build
Enable cross-build mode. (You probably do not want to set this manually.)
Environment variables used:
CC
Use this path to invoke the compiler instead of `RbConfig::CONFIG['CC']`
CPPFLAGS
If this string is accepted by the C preprocessor, add it to the flags passed to the C preprocessor
CFLAGS
If this string is accepted by the compiler, add it to the flags passed to the compiler
LDFLAGS
If this string is accepted by the linker, add it to the flags passed to the linker
LIBS
Add this string to the flags passed to the linker
TEXT
end
private
def configure_cross_compiler
RbConfig::CONFIG["CC"] = RbConfig::MAKEFILE_CONFIG["CC"] = ENV["CC"] if ENV["CC"]
RbConfig::CONFIG["CXX"] = RbConfig::MAKEFILE_CONFIG["CXX"] = ENV["CXX"] if ENV["CXX"]
end
def build_with_system_libraries
header_dirs = [
"/usr/local/include",
"/opt/homebrew/include",
"/usr/include"
]
lib_dirs = [
"/usr/local/lib",
"/opt/homebrew/lib",
"/usr/lib"
]
dir_config("re2", header_dirs, lib_dirs)
unless have_library("re2")
abort "You must have re2 installed and specified with --with-re2-dir, please see https://github.com/google/re2/wiki/Install"
end
end
def build_with_vendored_libraries
message "Building re2 using packaged libraries.\n"
abseil_recipe, re2_recipe = load_recipes
process_recipe(abseil_recipe) do |recipe|
recipe.configure_options << '-DABSL_PROPAGATE_CXX_STD=ON'
# Workaround for https://github.com/abseil/abseil-cpp/issues/1510
recipe.configure_options << '-DCMAKE_CXX_FLAGS=-DABSL_FORCE_WAITER_MODE=4' if MiniPortile.windows?
end
process_recipe(re2_recipe) do |recipe|
recipe.configure_options += [
# Specify Abseil's path so RE2 will prefer that over any system Abseil
"-DCMAKE_PREFIX_PATH=#{abseil_recipe.path}",
'-DCMAKE_CXX_FLAGS=-DNDEBUG'
]
end
pc_file = File.join(re2_recipe.lib_path, 'pkgconfig', 're2.pc')
pkg_config_paths = [
File.join(abseil_recipe.lib_path, 'pkgconfig'),
File.join(re2_recipe.lib_path, 'pkgconfig')
]
static_pkg_config(pc_file, pkg_config_paths)
end
def build_extension
# Enable optional warnings but disable deprecated register warning for Ruby 2.6 support
$CFLAGS << " -Wall -Wextra -funroll-loops"
$CXXFLAGS << " -Wall -Wextra -funroll-loops"
$CPPFLAGS << " -Wno-register"
# Pass -x c++ to force gcc to compile the test program
# as C++ (as it will end in .c by default).
compile_options = +"-x c++"
have_library("stdc++")
have_header("stdint.h")
have_func("rb_gc_mark_movable") # introduced in Ruby 2.7
minimal_program = <<~SRC
#include <re2/re2.h>
int main() { return 0; }
SRC
re2_requires_version_flag = checking_for("re2 that requires explicit C++ version flag") do
!try_compile(minimal_program, compile_options)
end
if re2_requires_version_flag
# Recent versions of re2 depend directly on abseil, which requires a
# compiler with C++14 support (see
# https://github.com/abseil/abseil-cpp/issues/1127 and
# https://github.com/abseil/abseil-cpp/issues/1431). However, the
# `std=c++14` flag doesn't appear to suffice; we need at least
# `std=c++17`.
abort "Cannot compile re2 with your compiler: recent versions require C++14 support." unless %w[c++20 c++17 c++11 c++0x].any? do |std|
checking_for("re2 that compiles with #{std} standard") do
if try_compile(minimal_program, compile_options + " -std=#{std}")
compile_options << " -std=#{std}"
$CPPFLAGS << " -std=#{std}"
true
end
end
end
end
# Determine which version of re2 the user has installed.
# Revision d9f8806c004d added an `endpos` argument to the
# generic Match() function.
#
# To test for this, try to compile a simple program that uses
# the newer form of Match() and set a flag if it is successful.
checking_for("RE2::Match() with endpos argument") do
test_re2_match_signature = <<~SRC
#include <re2/re2.h>
int main() {
RE2 pattern("test");
re2::StringPiece *match;
pattern.Match("test", 0, 0, RE2::UNANCHORED, match, 0);
return 0;
}
SRC
if try_compile(test_re2_match_signature, compile_options)
$defs.push("-DHAVE_ENDPOS_ARGUMENT")
end
end
checking_for("RE2::Set::Match() with error information") do
test_re2_set_match_signature = <<~SRC
#include <vector>
#include <re2/re2.h>
#include <re2/set.h>
int main() {
RE2::Set s(RE2::DefaultOptions, RE2::UNANCHORED);
s.Add("foo", NULL);
s.Compile();
std::vector<int> v;
RE2::Set::ErrorInfo ei;
s.Match("foo", &v, &ei);
return 0;
}
SRC
if try_compile(test_re2_set_match_signature, compile_options)
$defs.push("-DHAVE_ERROR_INFO_ARGUMENT")
end
end
end
def static_pkg_config(pc_file, pkg_config_paths)
ENV["PKG_CONFIG_PATH"] = [*pkg_config_paths, ENV["PKG_CONFIG_PATH"]].compact.join(File::PATH_SEPARATOR)
static_library_paths = minimal_pkg_config(pc_file, '--libs-only-L', '--static')
.shellsplit
.map { |flag| flag.delete_prefix('-L') }
$LIBPATH = static_library_paths | $LIBPATH
# Replace all -l flags that can be found in one of the static library
# paths with the absolute path instead.
minimal_pkg_config(pc_file, '--libs-only-l', '--static')
.shellsplit
.each do |flag|
lib = "lib#{flag.delete_prefix('-l')}.#{$LIBEXT}"
if (static_lib_path = static_library_paths.find { |path| File.exist?(File.join(path, lib)) })
$libs << ' ' << File.join(static_lib_path, lib).shellescape
else
$libs << ' ' << flag.shellescape
end
end
append_ldflags(minimal_pkg_config(pc_file, '--libs-only-other', '--static'))
incflags = minimal_pkg_config(pc_file, '--cflags-only-I')
$INCFLAGS = [incflags, $INCFLAGS].join(" ").strip
cflags = minimal_pkg_config(pc_file, '--cflags-only-other')
$CFLAGS = [$CFLAGS, cflags].join(" ").strip
$CXXFLAGS = [$CXXFLAGS, cflags].join(" ").strip
end
def process_recipe(recipe)
cross_build_p = config_cross_build?
message "Cross build is #{cross_build_p ? "enabled" : "disabled"}.\n"
recipe.host = target_host
# Ensure x64-mingw-ucrt and x64-mingw32 use different library paths since the host
# is the same (x86_64-w64-mingw32).
recipe.target = File.join(recipe.target, target_arch) if cross_build_p
yield recipe
checkpoint = "#{recipe.target}/#{recipe.name}-#{recipe.version}-#{recipe.host}.installed"
name = recipe.name
version = recipe.version
if File.exist?(checkpoint)
message("Building re2 with a packaged version of #{name}-#{version}.\n")
else
message(<<~EOM)
---------- IMPORTANT NOTICE ----------
Building re2 with a packaged version of #{name}-#{version}.
Configuration options: #{recipe.configure_options.shelljoin}
EOM
# Use a temporary base directory to reduce filename lengths since
# Windows can hit a limit of 250 characters (CMAKE_OBJECT_PATH_MAX).
Dir.mktmpdir { |dir| Dir.chdir(dir) { recipe.cook } }
FileUtils.touch(checkpoint)
end
end
# See MiniPortile2's minimal_pkg_config:
# https://github.com/flavorjones/mini_portile/blob/52fb0bc41c89a10f1ac7b5abcf0157e059194374/lib/mini_portile2/mini_portile.rb#L760-L783
# and Ruby's pkg_config:
# https://github.com/ruby/ruby/blob/c505bb0ca0fd61c7ae931d26451f11122a2644e9/lib/mkmf.rb#L1916-L2004
def minimal_pkg_config(pc_file, *options)
if ($PKGCONFIG ||=
(pkgconfig = MakeMakefile.with_config("pkg-config") {MakeMakefile.config_string("PKG_CONFIG") || "pkg-config"}) &&
MakeMakefile.find_executable0(pkgconfig) && pkgconfig)
pkgconfig = $PKGCONFIG
else
raise RuntimeError, "pkg-config is not found"
end
response = xpopen([pkgconfig, *options, pc_file], err: %i[child out], &:read)
raise RuntimeError, response unless $?.success?
response.strip
end
def config_system_libraries?
enable_config("system-libraries", ENV.key?('RE2_USE_SYSTEM_LIBRARIES'))
end
def config_cross_build?
enable_config("cross-build")
end
# We use 'host' to set compiler prefix for cross-compiling. Prefer host_alias over host. And
# prefer i686 (what external dev tools use) to i386 (what ruby's configure.ac emits).
def target_host
host = RbConfig::CONFIG["host_alias"].empty? ? RbConfig::CONFIG["host"] : RbConfig::CONFIG["host_alias"]
host.gsub(/i386/, "i686")
end
def target_arch
RbConfig::CONFIG['arch']
end
end
end
extconf = RE2::Extconf.new
if arg_config('--help')
extconf.print_help
exit!(true)
end
extconf.configure