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CMake: Do not enable LTO by default for MSVC 

LTO is supposed to be enabled by default for VS Release builds
according to the VS prop files but a build log from JMC reveals
that /GL and /LTCG are not actually passed to cl.exe/link.exe
for some reason...

LTO also leads to *extremely* and unacceptably slow build times
when using link.exe, so let's disable it by default to actually
match the project files.
This commit is contained in:
Léo Lam 2021-04-26 01:18:17 +02:00
parent d0484a9ea9
commit ae9ac510e2
No known key found for this signature in database
GPG Key ID: 0DF30F9081000741
1 changed files with 9 additions and 9 deletions
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18
CMakeLists.txt
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@ -332,10 +332,15 @@ if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
endif() endif()
if(ENABLE_LTO) if(ENABLE_LTO)
check_and_add_flag(LTO -flto) if(CMAKE_C_COMPILER_ID MATCHES "MSVC")
if(CMAKE_CXX_COMPILER_ID STREQUAL GNU) add_compile_options(/GL)
set(CMAKE_AR gcc-ar) string(APPEND CMAKE_EXE_LINKER_FLAGS " /LTCG")
set(CMAKE_RANLIB gcc-ranlib) else()
check_and_add_flag(LTO -flto)
if(CMAKE_CXX_COMPILER_ID STREQUAL GNU)
set(CMAKE_AR gcc-ar)
set(CMAKE_RANLIB gcc-ranlib)
endif()
endif() endif()
endif() endif()
@ -362,11 +367,6 @@ if(NOT CMAKE_BUILD_TYPE)
"Build type (Release/Debug/RelWithDebInfo/MinSizeRel)" FORCE) "Build type (Release/Debug/RelWithDebInfo/MinSizeRel)" FORCE)
endif() endif()
if(CMAKE_BUILD_TYPE MATCHES "Release|RelWithDebInfo" AND CMAKE_C_COMPILER_ID MATCHES "MSVC")
add_compile_options(/GL)
string(APPEND CMAKE_EXE_LINKER_FLAGS " /LTCG")
endif()
if(ENABLE_GPROF) if(ENABLE_GPROF)
check_and_add_flag(HAVE_PG -pg) check_and_add_flag(HAVE_PG -pg)
if(NOT FLAG_C_HAVE_PG) if(NOT FLAG_C_HAVE_PG)