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gh-89536: Use ThinLTO policy if possible (gh-96766)
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@ -232,6 +232,9 @@ also be used to improve performance.
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.. versionadded:: 3.11
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To use ThinLTO feature, use ``--with-lto=thin`` on Clang.
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.. versionchanged:: 3.12
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Use ThinLTO as the default optimization policy on Clang if the compiler accepts the flag.
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.. cmdoption:: --enable-bolt
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Enable usage of the `BOLT post-link binary optimizer
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@ -453,6 +453,10 @@ Build Changes
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``va_start()`` is no longer called with a single parameter.
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(Contributed by Kumar Aditya in :gh:`93207`.)
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* CPython now uses the ThinLTO option as the default link time optimization policy
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if the Clang compiler accepts the flag.
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(Contributed by Dong-hee Na in :gh:`89536`.)
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C API Changes
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=============
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@ -0,0 +1,2 @@
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CPython now uses the ThinLTO option as the default policy if the Clang
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compiler accepts the flag. Patch by Dong-hee Na.
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82
configure
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configure
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@ -7837,8 +7837,49 @@ $as_echo "$as_me: llvm-ar found via xcrun: ${LLVM_AR}" >&6;}
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# Any changes made here should be reflected in the GCC+Darwin case below
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto"
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# Check that ThinLTO is accepted.
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -flto=thin" >&5
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$as_echo_n "checking whether C compiler accepts -flto=thin... " >&6; }
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if ${ax_cv_check_cflags___flto_thin+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ax_check_save_flags=$CFLAGS
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CFLAGS="$CFLAGS -flto=thin"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ax_cv_check_cflags___flto_thin=yes
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else
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ax_cv_check_cflags___flto_thin=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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CFLAGS=$ax_check_save_flags
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___flto_thin" >&5
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$as_echo "$ax_cv_check_cflags___flto_thin" >&6; }
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if test "x$ax_cv_check_cflags___flto_thin" = xyes; then :
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LTOFLAGS="-flto=thin -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto=thin"
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else
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LTOFLAGS="-flto -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto"
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fi
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY} -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto=${Py_LTO_POLICY}"
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@ -7847,7 +7888,42 @@ $as_echo "$as_me: llvm-ar found via xcrun: ${LLVM_AR}" >&6;}
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*)
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto"
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# Check that ThinLTO is accepted
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -flto=thin" >&5
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$as_echo_n "checking whether C compiler accepts -flto=thin... " >&6; }
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if ${ax_cv_check_cflags___flto_thin+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ax_check_save_flags=$CFLAGS
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CFLAGS="$CFLAGS -flto=thin"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ax_cv_check_cflags___flto_thin=yes
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else
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ax_cv_check_cflags___flto_thin=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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CFLAGS=$ax_check_save_flags
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___flto_thin" >&5
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$as_echo "$ax_cv_check_cflags___flto_thin" >&6; }
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if test "x$ax_cv_check_cflags___flto_thin" = xyes; then :
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LTOFLAGS="-flto=thin"
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else
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LTOFLAGS="-flto"
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fi
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY}"
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fi
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14
configure.ac
14
configure.ac
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@ -1863,8 +1863,15 @@ if test "$Py_LTO" = 'true' ; then
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# Any changes made here should be reflected in the GCC+Darwin case below
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto"
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# Check that ThinLTO is accepted.
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AX_CHECK_COMPILE_FLAG([-flto=thin],[
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LTOFLAGS="-flto=thin -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto=thin"
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],[
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LTOFLAGS="-flto -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto"
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]
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)
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY} -Wl,-export_dynamic -Wl,-object_path_lto,\"\$@\".lto"
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LTOCFLAGS="-flto=${Py_LTO_POLICY}"
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@ -1873,7 +1880,8 @@ if test "$Py_LTO" = 'true' ; then
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*)
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto"
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# Check that ThinLTO is accepted
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AX_CHECK_COMPILE_FLAG([-flto=thin],[LTOFLAGS="-flto=thin"],[LTOFLAGS="-flto"])
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY}"
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fi
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