diff options
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rwxr-xr-x | configure | 51 | ||||
| -rw-r--r-- | configure.in | 28 |
3 files changed, 67 insertions, 16 deletions
@@ -1,5 +1,9 @@ 2011-07-09 Roland McGrath <roland@hack.frob.com> + * configure.in (.ctors/.dtors header and trailer check): + Use an empirical test on a built program. + * configure: Regenerated. + * configure.in (-z relro check): Use an empirical test on a built DSO. Detect, but do not require, on ia64. * configure: Regenerated. @@ -6217,20 +6217,49 @@ $as_echo_n "checking whether to use .ctors/.dtors header and trailer... " >&6; } if ${libc_cv_ctors_header+:} false; then : $as_echo_n "(cached) " >&6 else - if { ac_try='${CC-cc} -Wl,--verbose 2>&1|grep SORT_BY_INIT_PRIORITY 1>&5' - { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 - (eval $ac_try) 2>&5 - ac_status=$? - $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 - test $ac_status = 0; }; }; then - libc_cv_ctors_header=no - else - libc_cv_ctors_header=yes - fi + libc_cv_ctors_header=yes + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + +int +main () +{ + +__attribute__ ((constructor)) void ctor (void) { puts("ctor"); } +__attribute__ ((destructor)) void dtor (void) { puts("dtor"); } + + ; + return 0; +} +_ACEOF +if ac_fn_c_try_link "$LINENO"; then : + if $READELF -WS conftest$ac_exeext | $AWK ' + { gsub(/\[ */, "[") } + $2 == ".ctors" || $2 == ".dtors" { + size = strtonum("0x" $6) + align = strtonum("0x" $NF) + seen[$2] = 1 + stub[$2] = size == align * 2 + } + END { + ctors_ok = !seen[".ctors"] || stub[".ctors"] + dtors_ok = !seen[".dtors"] || stub[".dtors"] + exit ((ctors_ok && dtors_ok) ? 0 : 1) + } + '; then : + libc_cv_ctors_header=no +fi + +else + as_fn_error $? "missing __attribute__ ((constructor)) support??" "$LINENO" 5 + +fi +rm -f core conftest.err conftest.$ac_objext \ + conftest$ac_exeext conftest.$ac_ext + fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ctors_header" >&5 $as_echo "$libc_cv_ctors_header" >&6; } - if test $libc_cv_ctors_header = no; then $as_echo "#define NO_CTORS_DTORS_SECTIONS 1" >>confdefs.h diff --git a/configure.in b/configure.in index e9464d89e6..e18b343416 100644 --- a/configure.in +++ b/configure.in @@ -1486,12 +1486,30 @@ EOF AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer, libc_cv_ctors_header, [dnl - if AC_TRY_COMMAND([${CC-cc} -Wl,--verbose 2>&1|grep SORT_BY_INIT_PRIORITY 1>&AS_MESSAGE_LOG_FD]); then - libc_cv_ctors_header=no - else libc_cv_ctors_header=yes - fi]) - + AC_TRY_LINK([], [ +__attribute__ ((constructor)) void ctor (void) { puts("ctor"); } +__attribute__ ((destructor)) void dtor (void) { puts("dtor"); } +], + [dnl + AS_IF([$READELF -WS conftest$ac_exeext | $AWK ' + { gsub(/\@<:@ */, "@<:@") } + $2 == ".ctors" || $2 == ".dtors" { + size = strtonum("0x" $6) + align = strtonum("0x" $NF) + seen@<:@$2@:>@ = 1 + stub@<:@$2@:>@ = size == align * 2 + } + END { + ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@ + dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@ + exit ((ctors_ok && dtors_ok) ? 0 : 1) + } + '], [libc_cv_ctors_header=no]) + ], [dnl + AC_MSG_ERROR([missing __attribute__ ((constructor)) support??]) + ]) + ]) if test $libc_cv_ctors_header = no; then AC_DEFINE(NO_CTORS_DTORS_SECTIONS) fi |