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[3.11] gh-96761: Fix build process of the clang compiler for _bootstrap_python (gh-96945) #97031

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Merged
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Sep 23, 2022
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[3.11] gh-96761: Fix build process of the clang compiler for _bootstrap_python (gh-96945) #97031

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2022-09-20-12-43-44.gh-issue-96761.IF29kR.rst
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Original file line number Diff line number Diff line change
@@ -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.
39 changes: 37 additions & 2 deletions configure
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6 changes: 4 additions & 2 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -1782,7 +1782,7 @@ 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.

Expand Down Expand Up @@ -1836,8 +1836,10 @@ 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)
Expand Down