bpo-44340: Add support for building with clang full/thin lto (GH-27231) · python/cpython@b2cf251 · GitHub
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bpo-44340: Add support for building with clang full/thin lto (GH-27231)
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‎Doc/using/configure.rst‎

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‎Misc/NEWS.d/next/Build/2021-07-19-01-09-56.bpo-44340.JNeOf4.rst‎

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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.

‎aclocal.m4‎

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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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3-
# 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,

‎configure‎

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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
@@ -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; }
@@ -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"

‎configure.ac‎

Lines changed: 45 additions & 12 deletions

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