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Hi! When not using -fno-unit-at-a-time, -fno-toplevel-reorder actually does reorder variables if -fsection-anchors (the default on ppc/ppc64), which breaks the compatibility _sys_errlist and _sys_siglist symbols - they all get the size of the @@ symver. Adding -fno-section-anchors fixes this. -fno-section-anchors has been added to gcc trunk only a month after -fno-toplevel-reorder and both appeared together in GCC 4.2, so I think it is safe to check for both options at once. 2008-04-11 Jakub Jelinek <jakub@redhat.com> * configure.in: Check for -fno-section-anchors in addition to -fno-toplevel-reorder. * configure: Rebuilt. --- libc/configure.in.jj 2008-02-01 10:54:28.000000000 +0100 +++ libc/configure.in 2008-04-11 19:01:25.000000000 +0200 @@ -1614,11 +1614,11 @@ EOF AC_SUBST(libc_cv_hashstyle) fi -AC_CACHE_CHECK(for -fno-toplevel-reorder, libc_cv_fno_toplevel_reorder, [dnl +AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl cat > conftest.c <<EOF int foo; EOF -if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors conftest.c 1>&AS_MESSAGE_LOG_FD]) then libc_cv_fno_toplevel_reorder=yes @@ -1627,7 +1627,7 @@ else fi rm -f conftest*]) if test $libc_cv_fno_toplevel_reorder = yes; then - fno_unit_at_a_time=-fno-toplevel-reorder + fno_unit_at_a_time=-fno-toplevel-reorder -fno-section-anchors else fno_unit_at_a_time=-fno-unit-at-a-time fi --- libc/configure.jj 2008-02-01 10:54:28.000000000 +0100 +++ libc/configure 2008-04-11 19:01:55.000000000 +0200 @@ -6411,15 +6411,15 @@ echo "${ECHO_T}$libc_cv_hashstyle" >&6; fi -{ echo "$as_me:$LINENO: checking for -fno-toplevel-reorder" >&5 -echo $ECHO_N "checking for -fno-toplevel-reorder... $ECHO_C" >&6; } +{ echo "$as_me:$LINENO: checking for -fno-toplevel-reorder -fno-section-anchors" >&5 +echo $ECHO_N "checking for -fno-toplevel-reorder -fno-section-anchors... $ECHO_C" >&6; } if test "${libc_cv_fno_toplevel_reorder+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else cat > conftest.c <<EOF int foo; EOF -if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder +if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors conftest.c 1>&5' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 @@ -6436,7 +6436,7 @@ fi { echo "$as_me:$LINENO: result: $libc_cv_fno_toplevel_reorder" >&5 echo "${ECHO_T}$libc_cv_fno_toplevel_reorder" >&6; } if test $libc_cv_fno_toplevel_reorder = yes; then - fno_unit_at_a_time=-fno-toplevel-reorder + fno_unit_at_a_time=-fno-toplevel-reorder -fno-section-anchors else fno_unit_at_a_time=-fno-unit-at-a-time fi Jakub
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