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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>
This commit is contained in:
Dong-hee Na 2022-09-23 11:00:44 +09:00 committed by GitHub
parent 9d432b4a18
commit 83d84e67cd
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3 changed files with 43 additions and 4 deletions
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2
Misc/NEWS.d/next/Build/2022-09-20-12-43-44.gh-issue-96761.IF29kR.rst Normal file
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@ -0,0 +1,2 @@
Fix the build process of clang compiler for :program:`_bootstrap_python` if
LTO optimization is applied. Patch by Matthias Görgens and Dong-hee Na.

37
configure generated vendored
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@ -7640,7 +7640,7 @@ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $PROFILE_TASK" >&5
$as_echo "$PROFILE_TASK" >&6; }
# Make llvm-relatec checks work on systems where llvm tools are not installed with their
# Make llvm-related checks work on systems where llvm tools are not installed with their
# normal names in the default $PATH (ie: Ubuntu). They exist under the
# non-suffixed name in their versioned llvm directory.
@ -7706,6 +7706,41 @@ if test "$Py_LTO" = 'true' ; then
case $CC in
*clang*)
LDFLAGS_NOLTO="-fno-lto"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -flto=thin" >&5
$as_echo_n "checking whether C compiler accepts -flto=thin... " >&6; }
if ${ax_cv_check_cflags___flto_thin+:} false; then :
$as_echo_n "(cached) " >&6
else
ax_check_save_flags=$CFLAGS
CFLAGS="$CFLAGS -flto=thin"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
ax_cv_check_cflags___flto_thin=yes
else
ax_cv_check_cflags___flto_thin=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS=$ax_check_save_flags
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___flto_thin" >&5
$as_echo "$ax_cv_check_cflags___flto_thin" >&6; }
if test "x$ax_cv_check_cflags___flto_thin" = xyes; then :
LDFLAGS_NOLTO="-flto=thin"
else
LDFLAGS_NOLTO="-flto"
fi
if test -n "$ac_tool_prefix"; then
# Extract the first word of "${ac_tool_prefix}llvm-ar", so it can be a program name with args.

6
configure.ac
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@ -1774,7 +1774,7 @@ then
fi
AC_MSG_RESULT($PROFILE_TASK)
# Make llvm-relatec checks work on systems where llvm tools are not installed with their
# Make llvm-related checks work on systems where llvm tools are not installed with their
# normal names in the default $PATH (ie: Ubuntu). They exist under the
# non-suffixed name in their versioned llvm directory.
@ -1828,8 +1828,10 @@ esac
if test "$Py_LTO" = 'true' ; then
case $CC in
*clang*)
dnl flag to disable lto during linking
LDFLAGS_NOLTO="-fno-lto"
dnl Clang linker requires -flto in order to link objects with LTO information.
dnl Thin LTO is faster and works for object files with full LTO information, too.
AX_CHECK_COMPILE_FLAG([-flto=thin],[LDFLAGS_NOLTO="-flto=thin"],[LDFLAGS_NOLTO="-flto"])
AC_SUBST(LLVM_AR)
AC_PATH_TOOL(LLVM_AR, llvm-ar, '', ${llvm_path})
AC_SUBST(LLVM_AR_FOUND)