mirror of https://github.com/python/cpython
bpo-44340: Add support for building with clang full/thin lto (GH-27231)
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Dong-hee Na
GitHub
parent
635bfe8162
commit
b2cf2513f9
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@ -171,7 +171,7 @@ recommended for best performance.
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.. versionadded:: 3.8
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.. cmdoption:: --with-lto
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.. cmdoption:: --with-lto=[full|thin|no|yes]
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Enable Link Time Optimization (LTO) in any build (disabled by default).
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@ -180,6 +180,9 @@ recommended for best performance.
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.. versionadded:: 3.6
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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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.. cmdoption:: --with-computed-gotos
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Enable computed gotos in evaluation loop (enabled by default on supported
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@ -0,0 +1,2 @@
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Add support for building with clang thin lto via --with-lto=thin/full. Patch
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by Dong-hee Na and Brett Holman.
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@ -1,6 +1,6 @@
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# generated automatically by aclocal 1.16.1 -*- Autoconf -*-
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# generated automatically by aclocal 1.16.3 -*- Autoconf -*-
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# Copyright (C) 1996-2018 Free Software Foundation, Inc.
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# Copyright (C) 1996-2020 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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@ -1545,7 +1545,8 @@ Optional Packages:
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--with-trace-refs enable tracing references for debugging purpose
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(default is no)
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--with-assertions build with C assertions enabled (default is no)
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--with-lto enable Link-Time-Optimization in any build (default
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--with-lto=[full|thin|no|yes]
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enable Link-Time-Optimization in any build (default
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is no)
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--with-hash-algorithm=[fnv|siphash24]
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select hash algorithm for use in Python/pyhash.c
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@ -3039,27 +3040,27 @@ VERSION=3.11
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SOVERSION=1.0
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# The later defininition of _XOPEN_SOURCE disables certain features
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# The later definition of _XOPEN_SOURCE disables certain features
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# on Linux, so we need _GNU_SOURCE to re-enable them (makedev, tm_zone).
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$as_echo "#define _GNU_SOURCE 1" >>confdefs.h
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# The later defininition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
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# The later definition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
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# certain features on NetBSD, so we need _NETBSD_SOURCE to re-enable
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# them.
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$as_echo "#define _NETBSD_SOURCE 1" >>confdefs.h
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# The later defininition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
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# The later definition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
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# certain features on FreeBSD, so we need __BSD_VISIBLE to re-enable
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# them.
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$as_echo "#define __BSD_VISIBLE 1" >>confdefs.h
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# The later defininition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
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# The later definition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
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# certain features on Mac OS X, so we need _DARWIN_C_SOURCE to re-enable
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# them.
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@ -6585,16 +6586,36 @@ $as_echo_n "checking for --with-lto... " >&6; }
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# Check whether --with-lto was given.
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if test "${with_lto+set}" = set; then :
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withval=$with_lto;
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if test "$withval" != no
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then
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Py_LTO='true'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
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$as_echo "yes" >&6; };
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else
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Py_LTO='false'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; };
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fi
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case "$withval" in
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full)
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Py_LTO='true'
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Py_LTO_POLICY='full'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
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$as_echo "yes" >&6; }
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;;
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thin)
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Py_LTO='true'
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Py_LTO_POLICY='thin'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
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$as_echo "yes" >&6; }
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;;
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yes)
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Py_LTO='true'
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Py_LTO_POLICY='default'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
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$as_echo "yes" >&6; }
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;;
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no)
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Py_LTO='false'
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; }
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;;
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*)
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Py_LTO='false'
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as_fn_error $? "unknown lto option: '$withval'" "$LINENO" 5
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;;
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esac
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else
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; }
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@ -6732,15 +6753,30 @@ $as_echo "$as_me: llvm-ar found via xcrun: ${LLVM_AR}" >&6;}
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case $ac_sys_system in
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Darwin*)
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# Any changes made here should be reflected in the GCC+Darwin case below
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LTOFLAGS="-flto -Wl,-export_dynamic"
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LTOCFLAGS="-flto"
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto -Wl,-export_dynamic"
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LTOCFLAGS="-flto"
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY} -Wl,-export_dynamic"
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LTOCFLAGS="-flto=${Py_LTO_POLICY}"
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fi
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;;
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*)
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LTOFLAGS="-flto"
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto"
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY}"
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fi
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;;
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esac
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;;
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*gcc*)
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if test $Py_LTO_POLICY = thin
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then
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as_fn_error $? "thin lto is not supported under gcc compiler." "$LINENO" 5
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fi
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case $ac_sys_system in
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Darwin*)
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LTOFLAGS="-flto -Wl,-export_dynamic"
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57
configure.ac
57
configure.ac
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@ -1360,16 +1360,34 @@ fi
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# Enable LTO flags
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AC_MSG_CHECKING(for --with-lto)
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AC_ARG_WITH(lto, AS_HELP_STRING([--with-lto], [enable Link-Time-Optimization in any build (default is no)]),
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AC_ARG_WITH(lto, AS_HELP_STRING([--with-lto=@<:@full|thin|no|yes@:>@], [enable Link-Time-Optimization in any build (default is no)]),
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[
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if test "$withval" != no
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then
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Py_LTO='true'
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AC_MSG_RESULT(yes);
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else
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Py_LTO='false'
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AC_MSG_RESULT(no);
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fi],
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case "$withval" in
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full)
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Py_LTO='true'
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Py_LTO_POLICY='full'
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AC_MSG_RESULT(yes)
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;;
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thin)
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Py_LTO='true'
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Py_LTO_POLICY='thin'
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AC_MSG_RESULT(yes)
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;;
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yes)
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Py_LTO='true'
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Py_LTO_POLICY='default'
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AC_MSG_RESULT(yes)
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;;
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no)
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Py_LTO='false'
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AC_MSG_RESULT(no)
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;;
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*)
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Py_LTO='false'
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AC_MSG_ERROR([unknown lto option: '$withval'])
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;;
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esac
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],
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[AC_MSG_RESULT(no)])
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if test "$Py_LTO" = 'true' ; then
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case $CC in
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@ -1405,15 +1423,30 @@ if test "$Py_LTO" = 'true' ; then
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case $ac_sys_system in
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Darwin*)
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# Any changes made here should be reflected in the GCC+Darwin case below
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LTOFLAGS="-flto -Wl,-export_dynamic"
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LTOCFLAGS="-flto"
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto -Wl,-export_dynamic"
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LTOCFLAGS="-flto"
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY} -Wl,-export_dynamic"
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LTOCFLAGS="-flto=${Py_LTO_POLICY}"
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fi
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;;
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*)
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LTOFLAGS="-flto"
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if test $Py_LTO_POLICY = default
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then
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LTOFLAGS="-flto"
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else
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LTOFLAGS="-flto=${Py_LTO_POLICY}"
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fi
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;;
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esac
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;;
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*gcc*)
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if test $Py_LTO_POLICY = thin
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then
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AC_MSG_ERROR([thin lto is not supported under gcc compiler.])
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fi
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case $ac_sys_system in
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Darwin*)
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LTOFLAGS="-flto -Wl,-export_dynamic"
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