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Issue #25702: A --with-lto configure option has been added that will
enable link time optimizations at build time during a make profile-opt.
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@ -504,7 +504,7 @@ profile-opt:
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$(MAKE) profile-removal
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build_all_generate_profile:
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$(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_GEN_FLAG)" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG)" LIBS="$(LIBS)"
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$(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LIBS="$(LIBS)"
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run_profile_task:
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: # FIXME: can't run for a cross build
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@ -514,7 +514,7 @@ build_all_merge_profile:
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$(LLVM_PROF_MERGER)
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build_all_use_profile:
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$(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_USE_FLAG)"
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$(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_USE_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) @LTOFLAGS@"
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# Compile and run with gcov
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.PHONY=coverage coverage-lcov coverage-report
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@ -388,6 +388,12 @@ Tests
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Build
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-----
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- Issue #25702: A --with-lto configure option has been added that will
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enable link time optimizations at build time during a make profile-opt.
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Some compilers and toolchains are known to not produce stable code when
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using LTO, be sure to test things thoroughly before relying on it.
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It can provide a few % speed up over profile-opt alone.
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- Issue #26624: Adds validation of ucrtbase[d].dll version with warning
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for old versions.
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46
configure
vendored
46
configure
vendored
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@ -673,6 +673,7 @@ LLVM_PROF_FILE
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LLVM_PROF_MERGER
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PGO_PROF_USE_FLAG
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PGO_PROF_GEN_FLAG
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LTOFLAGS
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ABIFLAGS
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LN
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MKDIR_P
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@ -807,6 +808,7 @@ with_suffix
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enable_shared
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enable_profiling
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with_pydebug
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with_lto
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with_hash_algorithm
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with_address_sanitizer
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with_libs
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@ -1487,6 +1489,8 @@ Optional Packages:
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compiler
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--with-suffix=.exe set executable suffix
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--with-pydebug build with Py_DEBUG defined
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--with-lto Enable Link Time Optimization in PGO builds.
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Disabled by default.
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--with-hash-algorithm=[fnv|siphash24]
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select hash algorithm
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--with-address-sanitizer
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@ -6560,6 +6564,48 @@ $as_echo "no" >&6; }
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fi
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# Enable LTO flags
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-lto" >&5
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$as_echo_n "checking for --with-lto... " >&6; }
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# Check whether --with-lto was given.
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if test "${with_lto+set}" = set; then :
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withval=$with_lto;
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if test "$withval" != no
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then
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Py_LTO='true'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
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$as_echo "yes" >&6; };
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else
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Py_LTO='false'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; };
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fi
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else
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; }
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fi
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if test "$Py_LTO" = 'true' ; then
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case $CC in
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*clang*)
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# Any changes made here should be reflected in the GCC+Darwin case below
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LTOFLAGS="-flto"
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;;
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*gcc*)
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case $ac_sys_system in
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Darwin*)
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LTOFLAGS="-flto"
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;;
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*)
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LTOFLAGS="-flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none"
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;;
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esac
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;;
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esac
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fi
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# Enable PGO flags.
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33
configure.ac
33
configure.ac
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@ -1235,6 +1235,39 @@ else AC_MSG_RESULT(no); Py_DEBUG='false'
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fi],
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[AC_MSG_RESULT(no)])
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# Enable LTO flags
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AC_SUBST(LTOFLAGS)
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AC_MSG_CHECKING(for --with-lto)
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AC_ARG_WITH(lto, AS_HELP_STRING([--with-lto], [Enable Link Time Optimization in PGO builds. Disabled by default.]),
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[
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if test "$withval" != no
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then
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Py_LTO='true'
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AC_MSG_RESULT(yes);
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else
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Py_LTO='false'
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AC_MSG_RESULT(no);
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fi],
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[AC_MSG_RESULT(no)])
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if test "$Py_LTO" = 'true' ; then
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case $CC in
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*clang*)
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# Any changes made here should be reflected in the GCC+Darwin case below
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LTOFLAGS="-flto"
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;;
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*gcc*)
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case $ac_sys_system in
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Darwin*)
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LTOFLAGS="-flto"
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;;
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*)
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LTOFLAGS="-flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none"
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;;
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esac
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;;
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esac
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fi
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# Enable PGO flags.
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AC_SUBST(PGO_PROF_GEN_FLAG)
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AC_SUBST(PGO_PROF_USE_FLAG)
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