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| author | Gregory P. Smith ext:(%20%5BGoogle%20Inc.%5D) <greg@krypto.org> | 2016-06-02 23:44:40 +0000 |
|---|---|---|
| committer | Gregory P. Smith ext:(%20%5BGoogle%20Inc.%5D) <greg@krypto.org> | 2016-06-02 23:44:40 +0000 |
| commit | c543a0fc3b2052c35fced09e1f96613625723508 (patch) | |
| tree | f551ebf654a813212517ab06f94ca3908e67d5ea /Makefile.pre.in | |
| parent | e725777eaf430c67db5f4c9cc1f5ee77bc5ad3b5 (diff) | |
| download | cpython-git-c543a0fc3b2052c35fced09e1f96613625723508.tar.gz | |
Issue #25702: A --with-lto configure option has been added that will
enable link time optimizations at build time during a make profile-opt.
Some compilers and toolchains are known to not produce stable code when
using LTO, be sure to test things thoroughly before relying on it.
It can provide a few % speed up over profile-opt alone.
Diffstat (limited to 'Makefile.pre.in')
| -rw-r--r-- | Makefile.pre.in | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Makefile.pre.in b/Makefile.pre.in index 865d754e20..d54a098341 100644 --- a/Makefile.pre.in +++ b/Makefile.pre.in @@ -451,7 +451,7 @@ profile-opt: $(MAKE) profile-removal build_all_generate_profile: - $(MAKE) all CFLAGS="$(CFLAGS) $(PGO_PROF_GEN_FLAG)" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG)" LIBS="$(LIBS)" + $(MAKE) all CFLAGS="$(CFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LIBS="$(LIBS)" run_profile_task: : # FIXME: can't run for a cross build @@ -461,7 +461,7 @@ build_all_merge_profile: $(LLVM_PROF_MERGER) build_all_use_profile: - $(MAKE) all CFLAGS="$(CFLAGS) $(PGO_PROF_USE_FLAG)" + $(MAKE) all CFLAGS="$(CFLAGS) $(PGO_PROF_USE_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) @LTOFLAGS@" # Compile and run with gcov .PHONY=coverage coverage-lcov coverage-report |