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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/28738] New: LIBC_LINKER_FEATURE doesn't work on linker -z
 option
Date: Sun, 02 Jan 2022 14:00:15 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28738

            Bug ID: 28738
           Summary: LIBC_LINKER_FEATURE doesn't work on linker -z option
           Product: glibc
           Version: 2.35
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

[hjl@gnu-tgl-2 tmp]$ touch x.c
[hjl@gnu-tgl-2 tmp]$ gcc -shared -Wl,-z,foobar x.c
/usr/local/bin/ld: warning: -z foobar ignored
[hjl@gnu-tgl-2 tmp]$ echo $?
0
[hjl@gnu-tgl-2 tmp]$=20

But LIBC_LINKER_FEATURE has

dnl Check linker option support.
dnl LIBC_LINKER_FEATURE([ld_option], [cc_option], [action-if-true],
[action-if-false])
AC_DEFUN([LIBC_LINKER_FEATURE],
[AC_MSG_CHECKING([for linker that supports $1])
libc_linker_feature=3Dno
if test x"$gnu_ld" =3D x"yes"; then
  cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
                    $2 -nostdlib -nostartfiles
                    -fPIC -shared -o conftest.so conftest.c
                    1>&AS_MESSAGE_LOG_FD])
  then
    libc_linker_feature=3Dyes
  fi
  rm -f conftest*
fi

Check for any linker -z option will be successful.

--=20
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