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gh-96761: Fix build process of the clang compiler for _bootstrap_python (gh-96945)
Co-authored-by: Matthias Goergens <matthias.goergens@gmail.com>
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@ -0,0 +1,2 @@
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Fix the build process of clang compiler for :program:`_bootstrap_python` if
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LTO optimization is applied. Patch by Matthias Görgens and Dong-hee Na.
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configure
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configure
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@ -7640,7 +7640,7 @@ fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $PROFILE_TASK" >&5
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$as_echo "$PROFILE_TASK" >&6; }
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# Make llvm-relatec checks work on systems where llvm tools are not installed with their
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# Make llvm-related checks work on systems where llvm tools are not installed with their
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# normal names in the default $PATH (ie: Ubuntu). They exist under the
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# non-suffixed name in their versioned llvm directory.
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@ -7705,7 +7705,42 @@ fi
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if test "$Py_LTO" = 'true' ; then
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case $CC in
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*clang*)
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LDFLAGS_NOLTO="-fno-lto"
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LDFLAGS_NOLTO="-fno-lto"
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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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LDFLAGS_NOLTO="-flto=thin"
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else
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LDFLAGS_NOLTO="-flto"
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fi
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if test -n "$ac_tool_prefix"; then
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# Extract the first word of "${ac_tool_prefix}llvm-ar", so it can be a program name with args.
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@ -1774,7 +1774,7 @@ then
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fi
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AC_MSG_RESULT($PROFILE_TASK)
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# Make llvm-relatec checks work on systems where llvm tools are not installed with their
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# Make llvm-related checks work on systems where llvm tools are not installed with their
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# normal names in the default $PATH (ie: Ubuntu). They exist under the
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# non-suffixed name in their versioned llvm directory.
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@ -1828,8 +1828,10 @@ esac
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if test "$Py_LTO" = 'true' ; then
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case $CC in
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*clang*)
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dnl flag to disable lto during linking
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LDFLAGS_NOLTO="-fno-lto"
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dnl Clang linker requires -flto in order to link objects with LTO information.
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dnl Thin LTO is faster and works for object files with full LTO information, too.
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AX_CHECK_COMPILE_FLAG([-flto=thin],[LDFLAGS_NOLTO="-flto=thin"],[LDFLAGS_NOLTO="-flto"])
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AC_SUBST(LLVM_AR)
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AC_PATH_TOOL(LLVM_AR, llvm-ar, '', ${llvm_path})
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AC_SUBST(LLVM_AR_FOUND)
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