qt5base-lts/mkspecs/features/ltcg.prf
Yuhang Zhao 36827faa18 Clang: Add Thin LTO in addition to Full LTO
Change-Id: I6502f3ff31c16faebd9b931b99b77a273971f611
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2019-03-20 17:21:08 +00:00

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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
# for static libraries.
msvc {
# Nothing to do
} else {
!isEmpty(QMAKE_AR_LTCG): QMAKE_AR = $$QMAKE_AR_LTCG
!isEmpty(QMAKE_NM_LTCG): QMAKE_NM = $$QMAKE_NM_LTCG
equals(QMAKE_RANLIB_LTCG, true): QMAKE_RANLIB =
else: !isEmpty(QMAKE_RANLIB_LTCG): QMAKE_RANLIB = $$QMAKE_RANLIB_LTCG
static:isEmpty(QMAKE_AR_LTCG):isEmpty(QMAKE_RANLIB_LTCG) {
# We don't know how to create symbol tables for static libs with this
# compiler, so disable LTCG
QMAKE_CFLAGS_LTCG =
QMAKE_CXXFLAGS_LTCG =
QMAKE_LFLAGS_LTCG =
}
}
fat-lto {
QMAKE_CFLAGS_LTCG += $$QMAKE_CFLAGS_LTCG_FATOBJECTS
QMAKE_CXXFLAGS_LTCG += $$QMAKE_CXXFLAGS_LTCG_FATOBJECTS
}
load(link_ltcg)
QMAKE_CFLAGS *= $$QMAKE_CFLAGS_LTCG
QMAKE_CXXFLAGS *= $$QMAKE_CXXFLAGS_LTCG
QMAKE_LFLAGS *= $$QMAKE_LFLAGS_LTCG
}