8000 Revert "gh-130048: Reintroduce full LTO as default on Clang (GH-13004… · python/cpython@aa28423 · GitHub
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Revert "gh-130048: Reintroduce full LTO as default on Clang (GH-130049)" (#130088)
This reverts commit 34c06cc.
1 parent 28f5e3d commit aa28423

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‎Doc/using/configure.rst

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@@ -575,9 +575,6 @@ also be used to improve performance.
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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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.. versionchanged:: next
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Revert to using full LTO as the default optimization policy on Clang.
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.. option:: --enable-bolt
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Enable usage of the `BOLT post-link binary optimizer

‎Doc/whatsnew/3.14.rst

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@@ -1279,10 +1279,6 @@ Build changes
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* GNU Autoconf 2.72 is now required to generate :file:`configure`.
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(Contributed by Erlend Aasland in :gh:`115765`.)
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* CPython now uses Full LTO as the default link time optimization policy
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on Clang. This reverts an earlier change in CPython 3.12.
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(Contributed by Ken Jin in :gh:`130049`.)
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.. _whatsnew314-pep761:
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PEP 761: Discontinuation of PGP signatures

‎Misc/NEWS.d/next/Build/2025-02-12-19-51-19.gh-issue-130048.kHNkzP.rst

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‎configure

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‎configure.ac

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@@ -1986,8 +1986,15 @@ 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=${Py_LTO_POLICY}"
@@ -1996,7 +2003,8 @@ if test "$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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