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Use an empirical check for .ctors/.dtors -> .init_array/.fini_array magic.

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This commit is contained in:
Roland McGrath 2011-07-09 14:41:39 -07:00
parent 574920b446
commit 113ddea447
3 changed files with 67 additions and 16 deletions
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4
ChangeLog
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@ -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.

51
configure vendored
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@ -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

28
configure.in
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@ -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