Issue while building on Apple M1 with AppleClang 12

[pramodk]

Building todays master on vanila Apple M1 with apple clang:

bb-fvff266jq05n:build kumbhar$ cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/nmodl
-- The CXX compiler identification is AppleClang 12.0.0.12000032
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- CHECKING FOR FLEX/BISON
-- Found FLEX: /opt/homebrew/opt/flex/bin/flex (found suitable version "2.6.4", minimum required is "2.6") 
-- Found BISON: /opt/homebrew/opt/bison/bin/bison (found suitable version "3.7.5", minimum required is "3.0") 
--  Adding Flex include path as : /opt/homebrew/opt/flex/include/
-- Found Git: /usr/bin/git (found version "2.24.3 (Apple Git-128)") 
-- Sub-project : using fmt from "/Users/kumbhar/nmodl/ext/fmt"
-- Sub-project : using spdlog from "/Users/kumbhar/nmodl/ext/spdlog"
-- Sub-project : using pybind11 from "/Users/kumbhar/nmodl/ext/pybind11"
-- pybind11 v2.6.1 
-- Found PythonInterp: /opt/homebrew/bin/python3.9 (found version "3.9.2") 
-- Found PythonLibs: /opt/homebrew/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/lib/libpython3.9.dylib
-- Performing Test HAS_FLTO
-- Performing Test HAS_FLTO - Success
-- Performing Test HAS_FLTO_THIN
-- Performing Test HAS_FLTO_THIN - Success
-- Sub-project : using cli11 from "/Users/kumbhar/nmodl/ext/cli11"
-- Sub-project : using eigen from "/Users/kumbhar/nmodl/ext/eigen"
-- Version: 6.2.0
-- Build type: 
-- CXX_STANDARD: 11
-- Performing Test has_std_11_flag
-- Performing Test has_std_11_flag - Success
-- Performing Test has_std_0x_flag
-- Performing Test has_std_0x_flag - Success
-- Performing Test SUPPORTS_USER_DEFINED_LITERALS
-- Performing Test SUPPORTS_USER_DEFINED_LITERALS - Success
-- Performing Test FMT_HAS_VARIANT
-- Performing Test FMT_HAS_VARIANT - Success
-- Required features: cxx_variadic_templates
-- Performing Test HAS_NULLPTR_WARNING
-- Performing Test HAS_NULLPTR_WARNING - Success
-- Looking for strtod_l
-- Looking for strtod_l - found
-- Sub-project : using hpc-coding-conventions from "/Users/kumbhar/nmodl/cmake/hpc-coding-conventions"
-- NMODL_FORMATTING: OFF
-- NMODL_FORMATTING_ON: all
-- NMODL_FORMATTING_CPP_CHANGES_ONLY: OFF
-- NMODL_TEST_FORMATTING: OFF
-- NMODL_FORMATTING_NO_SUBMODULES: ON
-- NMODL_CLANG_FORMAT: OFF
-- NMODL_CMAKE_FORMAT: OFF
-- NMODL_GIT_HOOKS: OFF
-- NMODL_GIT_COMMIT_HOOKS: 
-- NMODL_GIT_PUSH_HOOKS: courtesy-msg
-- NMODL_STATIC_ANALYSIS: OFF
-- NMODL_TEST_STATIC_ANALYSIS: OFF
-- Could NOT find ClangFormat (missing: ClangFormat_EXECUTABLE) 
-- CHECKING FOR PYTHON
-- Found PythonInterp: /opt/homebrew/bin/python3.9 (found suitable version "3.9.2", minimum required is "3.5") 
-- 
-- Configured NMODL 0.2 (791b8a1 2021-02-25 08:23:25 +0100)
-- 
-- Some things you can do now:
-- --------------------+--------------------------------------------------------
-- Command             |   Description
-- --------------------+--------------------------------------------------------
-- make                | Build the project
-- make test           | Run unit tests
-- make install        | Will install NMODL to: /Users/kumbhar/nmodl
-- --------------------+--------------------------------------------------------
--  Build option       | Status
-- --------------------+--------------------------------------------------------
-- CXX COMPILER        | /Library/Developer/CommandLineTools/usr/bin/c++
-- COMPILE FLAGS       | 
-- Build Type          | 
-- Legacy Units        | OFF
-- Python Bindings     | ON
-- Flex                | /opt/homebrew/opt/flex/bin/flex
-- Bison               | /opt/homebrew/opt/bison/bin/bison
-- Python              | /opt/homebrew/bin/python3.9
-- --------------+--------------------------------------------------------------
--  See documentation : https://github.com/BlueBrain/nmodl/
-- --------------+--------------------------------------------------------------
-- 
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/kumbhar/nmodl/build

But while building I see:

bb-fvff266jq05n:build kumbhar$ make
Scanning dependencies of target util_obj
[  1%] Building CXX object src/utils/CMakeFiles/util_obj.dir/common_utils.cpp.o
[  1%] Building CXX object src/utils/CMakeFiles/util_obj.dir/file_library.cpp.o
[  2%] Building CXX object src/utils/CMakeFiles/util_obj.dir/logger.cpp.o
[  2%] Building CXX object src/utils/CMakeFiles/util_obj.dir/perf_stat.cpp.o
[  3%] Building CXX object src/utils/CMakeFiles/util_obj.dir/table_data.cpp.o
[  3%] Building CXX object src/utils/CMakeFiles/util_obj.dir/__/config/config.cpp.o
[  3%] Built target util_obj
....
Scanning dependencies of target testlexer
[ 26%] Building CXX object test/unit/CMakeFiles/testlexer.dir/lexer/tokens.cpp.o
In file included from /Users/kumbhar/nmodl/test/unit/lexer/tokens.cpp:12:
/Users/kumbhar/nmodl/ext/catch/catch.hpp:4167:13: error: invalid token in expression
            CATCH_BREAK_INTO_DEBUGGER();
            ^
/Users/kumbhar/nmodl/ext/catch/catch.hpp:1392:75: note: expanded from macro 'CATCH_BREAK_INTO_DEBUGGER'
    #define CATCH_BREAK_INTO_DEBUGGER() if( Catch::isDebuggerActive() ) { CATCH_TRAP(); }
                                                                          ^
/Users/kumbhar/nmodl/ext/catch/catch.hpp:1371:34: note: expanded from macro 'CATCH_TRAP'
    #define CATCH_TRAP() __asm__("int $3\n" : : ) /* NOLINT */
                                 ^
<inline asm>:1:6: note: instantiated into assembly here
        int $3
            ^
In file included from /Users/kumbhar/nmodl/test/unit/lexer/tokens.cpp:12:
/Users/kumbhar/nmodl/ext/catch/catch.hpp:4167:13: error: invalid operand
            CATCH_BREAK_INTO_DEBUGGER();
            ^
/Users/kumbhar/nmodl/ext/catch/catch.hpp:1392:75: note: expanded from macro 'CATCH_BREAK_INTO_DEBUGGER'
    #define CATCH_BREAK_INTO_DEBUGGER() if( Catch::isDebuggerActive() ) { CATCH_TRAP(); }
                                                                          ^
/Users/kumbhar/nmodl/ext/catch/catch.hpp:1371:34: note: expanded from macro 'CATCH_TRAP'
    #define CATCH_TRAP() __asm__("int $3\n" : : ) /* NOLINT */
                                 ^
<inline asm>:1:6: note: instantiated into assembly here
        int $3
            ^
...