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Clang: Add Thin LTO in addition to Full LTO

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Change-Id: I6502f3ff31c16faebd9b931b99b77a273971f611
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Yuhang Zhao 2019-03-18 17:17:22 +08:00
parent 322b052dd7
commit 36827faa18
4 changed files with 13 additions and 3 deletions
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4
mkspecs/common/clang.conf
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@ -19,7 +19,8 @@ QMAKE_PCH_OUTPUT_EXT = .pch
QMAKE_CFLAGS_ISYSTEM = -isystem
QMAKE_CFLAGS_PRECOMPILE = -x c-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
QMAKE_CFLAGS_USE_PRECOMPILE = -Xclang -include-pch -Xclang ${QMAKE_PCH_OUTPUT}
QMAKE_CFLAGS_LTCG = -flto
QMAKE_CFLAGS_LTCG = -flto=thin
QMAKE_CFLAGS_LTCG_FATOBJECTS = -flto
QMAKE_CFLAGS_DISABLE_LTCG = -fno-lto
QMAKE_CFLAGS_GNUC99 = -std=gnu99
QMAKE_CFLAGS_GNUC11 = -std=gnu11
@ -27,6 +28,7 @@ QMAKE_CFLAGS_GNUC11 = -std=gnu11
QMAKE_CXXFLAGS_PRECOMPILE = -x c++-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
QMAKE_CXXFLAGS_LTCG = $$QMAKE_CFLAGS_LTCG
QMAKE_CXXFLAGS_LTCG_FATOBJECTS = $$QMAKE_CFLAGS_LTCG_FATOBJECTS
QMAKE_CXXFLAGS_DISABLE_LTCG = $$QMAKE_CFLAGS_DISABLE_LTCG
QMAKE_CXXFLAGS_CXX11 = -std=c++11
QMAKE_CXXFLAGS_CXX14 = -std=c++1y

2
mkspecs/features/ltcg.prf
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@ -2,7 +2,7 @@ CONFIG(release, debug|release) {
# We need fat object files when creating static libraries on some platforms
# so the linker will know to load a particular object from the library
# in the first place. On others, we have special ar and nm to create the symbol
# tables so the linker will know better. For other compilers, we disable LTCG
# tables so the linker will know better. For other compilers, we disable LTCG
# for static libraries.
msvc {
# Nothing to do

6
mkspecs/win32-clang-g++/qmake.conf
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@ -24,4 +24,10 @@ QMAKE_CXXFLAGS_WARN_ON = $$QMAKE_CFLAGS_WARN_ON
QMAKE_LINK = $${CROSS_COMPILE}clang++
QMAKE_LINK_C = $${CROSS_COMPILE}clang
QMAKE_CFLAGS_LTCG = -flto=thin
QMAKE_CXXFLAGS_LTCG = $$QMAKE_CFLAGS_LTCG
QMAKE_CFLAGS_LTCG_FATOBJECTS = -flto
QMAKE_CXXFLAGS_LTCG_FATOBJECTS = $$QMAKE_CFLAGS_LTCG_FATOBJECTS
QMAKE_LFLAGS_LTCG = $$QMAKE_CFLAGS_LTCG
load(qt_config)

4
mkspecs/win32-clang-msvc/qmake.conf
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@ -39,8 +39,10 @@ QMAKE_CXXFLAGS += -Wno-microsoft-enum-value
QMAKE_LINK = lld-link
QMAKE_LIB = llvm-lib /NOLOGO
QMAKE_CFLAGS_LTCG = -flto
QMAKE_CFLAGS_LTCG = -flto=thin
QMAKE_CXXFLAGS_LTCG = $$QMAKE_CFLAGS_LTCG
QMAKE_CFLAGS_LTCG_FATOBJECTS = -flto
QMAKE_CXXFLAGS_LTCG_FATOBJECTS = $$QMAKE_CFLAGS_LTCG_FATOBJECTS
# Leave QMAKE_LFLAGS_LTCG empty because lld-link doesn't need any additional parameters
QMAKE_LFLAGS_LTCG =