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2010-05-18  Steven Bosscher  <steven AT gcc.gnu.org>
	* configure.ac (--enable-lto): All *-apple-darwin* now support LTO.
	* configure: Regenerate.

	2010-05-07  Steven Bosscher  <steven AT gcc.gnu.org>
	* configure.ac (--enable-lto): Add x86_64-apple-darwin* as
	a platform that supports LTO.
	* configure: Regenerate.

	2010-04-27  Dave Korn  <dave.korn.cygwin AT gmail.com>
	PR lto/42776
	* configure.ac (--enable-lto): Refactor handling so libelf tests
	are only performed inside then-clause of ACX_ELF_TARGET_IFELSE,
	and allow LTO to be explicitly enabled on non-ELF platforms that
	are known to support it inside else-clause.
	* configure: Regenerate.
This commit is contained in:
Dave Korn
2010-05-26 05:16:31 +00:00
parent 71de140011
commit 0b3906a813
3 changed files with 141 additions and 101 deletions
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31
configure.ac
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@@ -1651,17 +1651,8 @@ AC_ARG_ENABLE(lto,
enable_lto=$enableval,
enable_lto=yes; default_enable_lto=yes)
ACX_ELF_TARGET_IFELSE([],
if test x"$default_enable_lto" = x"yes" ; then
enable_lto=no
else
if test x"$enable_lto" = x"yes"; then
AC_MSG_ERROR([LTO support requires an ELF target.])
fi
fi
default_enable_lto=no)
if test x"$enable_lto" = x"yes" ; then
ACX_ELF_TARGET_IFELSE([if test x"$enable_lto" = x"yes" ; then
# Make sure that libelf.h and gelf.h are available.
AC_ARG_WITH(libelf, [ --with-libelf=PATH Specify prefix directory for the installed libelf package
Equivalent to --with-libelf-include=PATH/include
@@ -1777,7 +1768,25 @@ to specify its location.])
# Flags needed for libelf.
AC_SUBST(libelflibs)
AC_SUBST(libelfinc)
fi
fi],[if test x"$default_enable_lto" = x"yes" ; then
# On non-ELF platforms, LTO must be explicitly enabled.
enable_lto=no
else
# Apart from ELF platforms, only Windows supports LTO so far. It
# would also be nice to check the binutils support, but we don't
# have gcc_GAS_CHECK_FEATURE available here. For now, we'll just
# warn during gcc/ subconfigure; unless you're bootstrapping with
# -flto it won't be needed until after installation anyway.
case $target in
*-cygwin*|*-mingw*) ;;
*-apple-darwin*) ;;
*) if test x"$enable_lto" = x"yes"; then
AC_MSG_ERROR([LTO support is not enabled for this target.])
fi
;;
esac
fi
default_enable_lto=no])
# By default, C is the only stage 1 language.