From 8ffb200153d1b1a8402c875c4961160efb149201 Mon Sep 17 00:00:00 2001 From: Joerg Bornemann Date: Wed, 6 Nov 2019 11:23:12 +0100 Subject: Fix LTCG linker flags for macOS with separate debug info The linker must not throw away the lto.o file. We now instruct the linker to create a non-temporary lto.o, dependent on the target name. In order to do that we introduce a new mkspec variable QMAKE_LFLAGS_LTCG_SEPARATE_DEBUG_INFO. This variable can contain single-$ variable references that get evaluated when loading ltcg.prf. Fixes: QTBUG-72846 Change-Id: I0ea882628d63e5406ba0ee68c7435af597364b0f Reviewed-by: Alexandru Croitor Reviewed-by: Edward Welbourne Reviewed-by: Kai Koehne --- mkspecs/common/clang-mac.conf | 1 + mkspecs/features/ltcg.prf | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/mkspecs/common/clang-mac.conf b/mkspecs/common/clang-mac.conf index cbae2e6262..143406308c 100644 --- a/mkspecs/common/clang-mac.conf +++ b/mkspecs/common/clang-mac.conf @@ -5,6 +5,7 @@ QMAKE_OBJCXXFLAGS_PRECOMPILE = -x objective-c++-header -c ${QMAKE_PCH_INPUT} QMAKE_OBJCXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE QMAKE_XCODE_GCC_VERSION = com.apple.compilers.llvm.clang.1_0 +QMAKE_LFLAGS_LTCG_SEPARATE_DEBUG_INFO = -Wl,-object_path_lto,${OBJECTS_DIR}/${TARGET}_lto.o QMAKE_CXXFLAGS += -stdlib=libc++ QMAKE_LFLAGS += -stdlib=libc++ diff --git a/mkspecs/features/ltcg.prf b/mkspecs/features/ltcg.prf index a94f6d0eeb..5fa6309016 100644 --- a/mkspecs/features/ltcg.prf +++ b/mkspecs/features/ltcg.prf @@ -1,6 +1,12 @@ static:no-static-ltcg { # Static library but no-static-ltcg enabled: skip LTCG } else: CONFIG(release, debug|release) { + separate_debug_info { + # Evaluate single-$ variable references that have no valid value at mkspec loading time + QMAKE_LFLAGS_LTCG_SEPARATE_DEBUG_INFO ~= s/\\$\\{/\$\$\{/ + eval(QMAKE_LFLAGS_LTCG += $$QMAKE_LFLAGS_LTCG_SEPARATE_DEBUG_INFO) + } + # 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 -- cgit v1.2.3