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ChangeLog:

2010-04-27  Dave Korn  <dave.korn.cygwin@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.

From-SVN: r158763
This commit is contained in:
Dave Korn 2010-04-27 02:23:56 +00:00
parent 3bec79c52e
commit 9a02962bf8

189
configure vendored
View File

@ -5997,95 +5997,7 @@ fi
target_elf=no
case $target in
*-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
*-msdosdjgpp* | *-netware* | *-vms* | *-wince* | *-*-pe* | \
alpha*-dec-osf* | *-interix* | hppa[12]*-*-hpux*)
target_elf=no
;;
*)
target_elf=yes
;;
esac
if test $target_elf = yes; then :
else
if test x"$default_enable_lto" = x"yes" ; then
enable_lto=no
else
if test x"$enable_lto" = x"yes"; then
as_fn_error "LTO support requires an ELF target." "$LINENO" 5
fi
fi
default_enable_lto=no
fi
if test x"$enable_lto" = x"yes" ; then
# Make sure that libelf.h and gelf.h are available.
# Check whether --with-libelf was given.
if test "${with_libelf+set}" = set; then :
withval=$with_libelf;
fi
# Check whether --with-libelf_include was given.
if test "${with_libelf_include+set}" = set; then :
withval=$with_libelf_include;
fi
# Check whether --with-libelf_lib was given.
if test "${with_libelf_lib+set}" = set; then :
withval=$with_libelf_lib;
fi
saved_CFLAGS="$CFLAGS"
saved_CPPFLAGS="$CPPFLAGS"
saved_LIBS="$LIBS"
case $with_libelf in
"")
libelflibs="-lelf"
libelfinc="-I/usr/include/libelf"
;;
*)
libelflibs="-L$with_libelf/lib -lelf"
libelfinc="-I$with_libelf/include -I$with_libelf/include/libelf"
LIBS="$libelflibs $LIBS"
;;
esac
if test "x$with_libelf_include" != x; then
libelfinc="-I$with_libelf_include"
fi
if test "x$with_libelf_lib" != x; then
libelflibs="-L$with_libelf_lib -lelf"
LIBS="$libelflibs $LIBS"
fi
if test "x$with_libelf$with_libelf_include$with_libelf_lib" = x \
&& test -d ${srcdir}/libelf; then
libelflibs='-L$$r/$(HOST_SUBDIR)/libelf/lib -lelf '
libelfinc='-D__LIBELF_INTERNAL__ -I$$r/$(HOST_SUBDIR)/libelf/lib -I$$s/libelf/lib'
LIBS="$libelflibs $LIBS"
else
CFLAGS="$CFLAGS $libelfinc"
CPPFLAGS="$CPPFLAGS $libelfinc"
LIBS="$LIBS $libelflibs"
ac_ext=c
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
@ -6483,7 +6395,83 @@ fi
done
for ac_header in libelf.h
target_elf=no
case $target in
*-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
*-msdosdjgpp* | *-netware* | *-vms* | *-wince* | *-*-pe* | \
alpha*-dec-osf* | *-interix* | hppa[12]*-*-hpux*)
target_elf=no
;;
*)
target_elf=yes
;;
esac
if test $target_elf = yes; then :
if test x"$enable_lto" = x"yes" ; then
# Make sure that libelf.h and gelf.h are available.
# Check whether --with-libelf was given.
if test "${with_libelf+set}" = set; then :
withval=$with_libelf;
fi
# Check whether --with-libelf_include was given.
if test "${with_libelf_include+set}" = set; then :
withval=$with_libelf_include;
fi
# Check whether --with-libelf_lib was given.
if test "${with_libelf_lib+set}" = set; then :
withval=$with_libelf_lib;
fi
saved_CFLAGS="$CFLAGS"
saved_CPPFLAGS="$CPPFLAGS"
saved_LIBS="$LIBS"
case $with_libelf in
"")
libelflibs="-lelf"
libelfinc="-I/usr/include/libelf"
;;
*)
libelflibs="-L$with_libelf/lib -lelf"
libelfinc="-I$with_libelf/include -I$with_libelf/include/libelf"
LIBS="$libelflibs $LIBS"
;;
esac
if test "x$with_libelf_include" != x; then
libelfinc="-I$with_libelf_include"
fi
if test "x$with_libelf_lib" != x; then
libelflibs="-L$with_libelf_lib -lelf"
LIBS="$libelflibs $LIBS"
fi
if test "x$with_libelf$with_libelf_include$with_libelf_lib" = x \
&& test -d ${srcdir}/libelf; then
libelflibs='-L$$r/$(HOST_SUBDIR)/libelf/lib -lelf '
libelfinc='-D__LIBELF_INTERNAL__ -I$$r/$(HOST_SUBDIR)/libelf/lib -I$$s/libelf/lib'
LIBS="$libelflibs $LIBS"
else
CFLAGS="$CFLAGS $libelfinc"
CPPFLAGS="$CPPFLAGS $libelfinc"
LIBS="$LIBS $libelflibs"
for ac_header in libelf.h
do :
ac_fn_c_check_header_mongrel "$LINENO" "libelf.h" "ac_cv_header_libelf_h" "$ac_includes_default"
if test "x$ac_cv_header_libelf_h" = x""yes; then :
@ -6668,6 +6656,27 @@ to specify its location." "$LINENO" 5
fi
else
if test x"$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 $target in
*-cygwin*|*-mingw*) ;;
*) if test x"$enable_lto" = x"yes"; then
as_fn_error "LTO support is not enabled for this target." "$LINENO" 5
fi
;;
esac
fi
default_enable_lto=no
fi
# By default, C is the only stage 1 language.