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improve `-ffile-prefix-map` detection (#2517) 

the current implementation has two problems:
  * `clang-cl` does not know `-ffile-prefix-map`, but in CMake it is
    reported as "Clang", so the compiler will warn about an unknown
    compiler option.
  * XCode's clang in CMake is reported as "AppleClang", so it is not picked
    up as "Clang", so it is not passed `-ffile-prefix-map`, even though
    it supports it.

Also changed the map so that the normalized `__FILE__` paths are the same
as what the approval tests normalize paths into.

Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>
This commit is contained in:
Tim Blechmann 2022-10-04 21:55:50 +08:00 committed by GitHub
parent 0e139b73e4
commit 728de353be
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1 changed files with 6 additions and 6 deletions
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12
CMake/CatchMiscFunctions.cmake
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@ -8,9 +8,10 @@
include(CheckCXXCompilerFlag)
function(add_cxx_flag_if_supported_to_targets flagname targets)
check_cxx_compiler_flag("${flagname}" HAVE_FLAG_${flagname})
string(MAKE_C_IDENTIFIER ${flagname} flag_identifier )
check_cxx_compiler_flag("${flagname}" HAVE_FLAG_${flag_identifier})
if (HAVE_FLAG_${flagname})
if (HAVE_FLAG_${flag_identifier})
foreach(target ${targets})
target_compile_options(${target} PUBLIC ${flagname})
endforeach()
@ -112,9 +113,8 @@ endfunction()
# Adds flags required for reproducible build to the target
# Currently only supports GCC and Clang
function(add_build_reproducibility_settings target)
# Make the build reproducible on versions of g++ and clang that supports -ffile-prefix-map
if(("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 8) OR
("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 10))
target_compile_options(${target} PRIVATE "-ffile-prefix-map=${CATCH_DIR}=.")
# Make the build reproducible on versions of g++ and clang that supports -ffile-prefix-map
if((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
add_cxx_flag_if_supported_to_targets("-ffile-prefix-map=${CATCH_DIR}/=" "${target}")
endif()
endfunction()