elf: Fix _dl_debug_vdprintf to work before self-relocation

The strlen might trigger and invalid GOT entry if it used before
the process is self-relocated (for instance on dl-tunables if any
error occurs).

For i386, _dl_writev with PIE requires to use the old 'int $0x80'
syscall mode because the calling the TLS register (gs) is not yet
initialized.

Checked on x86_64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

stdio-common/Makefile

@@ -460,6 +460,11 @@ CFLAGS-isoc23_scanf.c += -fexceptions
 
 CFLAGS-dprintf.c += $(config-cflags-wno-ignored-attributes)
 
+# Called during static library initialization, so turn stack-protection
+# off for non-shared builds.
+CFLAGS-_itoa.o = $(no-stack-protector)
+CFLAGS-_itoa.op = $(no-stack-protector)
+
 # scanf18.c and scanf19.c test a deprecated extension which is no
 # longer visible under most conformance levels; see the source files
 # for more detail.

stdio-common/_itoa.c

@@ -16,6 +16,11 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+/* Mark symbols hidden in static PIE for early self relocation to work.
+   Note: string.h may have ifuncs which cannot be hidden on i686.  */
+#if BUILD_PIE_DEFAULT
+# pragma GCC visibility push(hidden)
+#endif
 #include <gmp-mparam.h>
 #include <gmp.h>
 #include <limits.h>