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| author | Gregory P. Smith <greg@krypto.org> | 2016-04-15 23:57:04 (GMT) |
|---|---|---|
| committer | Gregory P. Smith <greg@krypto.org> | 2016-04-15 23:57:04 (GMT) |
| commit | d82da9f7f22cd0e81e4de3d7331668d3aa9b0811 (patch) | |
| tree | 242d8b5a519af5157256e87d9514cbb82f7350dc /configure.ac | |
| parent | 1ff6b6ab121bce00cb9395fce034d09665ec8d77 (diff) | |
| download | cpython-d82da9f7f22cd0e81e4de3d7331668d3aa9b0811.zip cpython-d82da9f7f22cd0e81e4de3d7331668d3aa9b0811.tar.gz cpython-d82da9f7f22cd0e81e4de3d7331668d3aa9b0811.tar.bz2 | |
Issue #25702: A --with-lto configure option has been added that will
enable link time optimizations at build time during a make profile-opt.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 7149830..b13cf05 100644 --- a/configure.ac +++ b/configure.ac @@ -1235,6 +1235,39 @@ else AC_MSG_RESULT(no); Py_DEBUG='false' fi], [AC_MSG_RESULT(no)]) +# Enable LTO flags +AC_SUBST(LTOFLAGS) +AC_MSG_CHECKING(for --with-lto) +AC_ARG_WITH(lto, AS_HELP_STRING([--with-lto], [Enable Link Time Optimization in PGO builds. Disabled by default.]), +[ +if test "$withval" != no +then + Py_LTO='true' + AC_MSG_RESULT(yes); +else + Py_LTO='false' + AC_MSG_RESULT(no); +fi], +[AC_MSG_RESULT(no)]) +if test "$Py_LTO" = 'true' ; then + case $CC in + *clang*) + # Any changes made here should be reflected in the GCC+Darwin case below + LTOFLAGS="-flto" + ;; + *gcc*) + case $ac_sys_system in + Darwin*) + LTOFLAGS="-flto" + ;; + *) + LTOFLAGS="-flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none" + ;; + esac + ;; + esac +fi + # Enable PGO flags. AC_SUBST(PGO_PROF_GEN_FLAG) AC_SUBST(PGO_PROF_USE_FLAG) |