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cmake: make possible to enable LTO when compiling dll games #1481

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cmake: make possible to enable LTO when compiling dll games #1481

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37 changes: 31 additions & 6 deletions cmake/DaemonFlags.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -68,10 +68,19 @@ macro(set_c_cxx_flag FLAG)
set_c_flag(${FLAG} ${ARGN})
set_cxx_flag(${FLAG} ${ARGN})
endmacro()

macro(set_kind_linker_flag KIND FLAG)
if (KIND STREQUAL "exe")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${FLAG}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${FLAG}")
else()
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${FLAG}")
endif()
endmacro()

macro(set_linker_flag FLAG)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${FLAG}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${FLAG}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${FLAG}")
set_kind_linker_flag("exe" FLAG)
set_kind_linker_flag("shared" FLAG)
endmacro()

function(try_flag LIST FLAG)
Expand Down Expand Up @@ -142,6 +151,16 @@ macro(try_linker_flag PROP FLAG)
endif()
endmacro()

macro(try_kind_linker_flag KIND PROP FLAG)
# Check it with the C compiler
set(CMAKE_REQUIRED_FLAGS ${FLAG})
check_C_compiler_flag(${FLAG} FLAG_${KIND}_${PROP})
set(CMAKE_REQUIRED_FLAGS "")
if (FLAG_${KIND}_${PROP})
set_kind_linker_flag(${KIND} ${FLAG} ${ARGN})
endif()
endmacro()

if (BE_VERBOSE)
set(WARNMODE "no-error=")
else()
Expand Down Expand Up @@ -335,13 +354,19 @@ else()
try_c_cxx_flag(WSTACK_PROTECTOR "-Wstack-protector")

if (NOT NACL OR (NACL AND GAME_PIE))
try_c_cxx_flag(FPIE "-fPIE")
if (BUILD_GAME_NATIVE_DLL AND (BUILD_CGAME OR BUILD_SGAME))
try_c_cxx_flag(FPIC "-fPIC")
else()
try_c_cxx_flag(FPIE "-fPIE")
endif()

if (NOT APPLE)
try_linker_flag(LINKER_PIE "-pie")
try_kind_linker_flag("shared" LINKER_PIC "-pic")
try_kind_linker_flag("exe" LINKER_PIE "-pie")
endif()
endif()

if ("${FLAG_LINKER_PIE}" AND MINGW)
if ("${FLAG_shared_LINKER_PIE}" AND MINGW)
# https://github.com/msys2/MINGW-packages/issues/4100
if (ARCH STREQUAL "i686")
set_linker_flag("-Wl,-e,_mainCRTStartup")
Expand Down