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[CMake] Fixes /INCREMENTAL detection when considering adding /Brepro 

/INCREMENTAL is the linker default (lld-link and MSVC link). Specifying
"/INCREMENTAL:NO" is the only way to disable it. So checking for the
negative flag instead and check exe/module/shared link flags
independently.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D117381
This commit is contained in:
Yuanfang Chen 2022-01-24 13:42:39 -08:00
parent 3b64ab574d
commit d87459a0b8
1 changed files with 17 additions and 4 deletions
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21
llvm/cmake/modules/HandleLLVMOptions.cmake
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@ -277,6 +277,17 @@ function(add_flag_or_print_warning flag name)
endif()
endfunction()
function(has_msvc_incremental_no_flag flags incr_no_flag_on)
set(${incr_no_flag_on} OFF PARENT_SCOPE)
string(FIND "${flags}" "/INCREMENTAL" idx REVERSE)
if (${idx} GREATER -1)
string(SUBSTRING "${flags}" ${idx} 15 no_flag)
if (${no_flag} MATCHES "/INCREMENTAL:NO")
set(${incr_no_flag_on} ON PARENT_SCOPE)
endif()
endif()
endfunction()
if( LLVM_ENABLE_LLD )
if ( LLVM_USE_LINKER )
message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time")
@ -535,11 +546,13 @@ if( MSVC )
if (SUPPORTS_BREPRO)
# Check if /INCREMENTAL is passed to the linker and complain that it
# won't work with /Brepro.
string(FIND "${all_linker_flags_uppercase}" "/INCREMENTAL" linker_flag_idx)
if (${linker_flag_idx} GREATER -1)
message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")
else()
has_msvc_incremental_no_flag("${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_EXE_LINKER_FLAGS}" NO_INCR_EXE)
has_msvc_incremental_no_flag("${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_MODULE_LINKER_FLAGS}" NO_INCR_MODULE)
has_msvc_incremental_no_flag("${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_SHARED_LINKER_FLAGS}" NO_INCR_SHARED)
if (NO_INCR_EXE AND NO_INCR_MODULE AND NO_INCR_SHARED)
append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")
endif()
endif()
endif()