[Bug build/14865] New: linker -z XXXX support isn't properly checked

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14865

             Bug #: 14865
           Summary: linker -z XXXX support isn't properly checked
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: hjl.tools@gmail.com
                CC: carlos@systemhalted.org
    Classification: Unclassified


GNU linker ignores unknown -z XXX option with a warning:

[hjl@gnu-6 tmp]$ ld -z foobar -shared x.o
ld: warning: -z foobar ignored.
[hjl@gnu-6 tmp]$ echo $?
0
[hjl@gnu-6 tmp]$ 

We use

AC_CACHE_CHECK(for -z execstack,
               libc_cv_z_execstack, [dnl 
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
                            -fPIC -shared -o conftest.so conftest.c
                            -Wl,-z,execstack -nostdlib
                            1>&AS_MESSAGE_LOG_FD])
then
  libc_cv_z_execstack=yes
else
  libc_cv_z_execstack=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_z_execstack)

to check if linker supports -z execstack, which will always
succeed.

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