Description:

gcc is my usual compiler, but apparently a bug I have with firefox is the result of using gcc 4.9.1 to compile it!
I compile it with gcc and all hardening options in this script without a problem, but it doesn't even start to compile with CC=clang and CXX=clang++
All of the other flags I have in makepkg cflags/ldflags, so I really only use the wrapper to add PIC/PIE/pie in the right places
I read that clang is using "-Wl,-pie" instead, which I tried, but that just broke it :)

Additional info: I wish this bug tracker had a code box feature!
Note: my libjpeg is fine, it accepts it with gcc, or with clang but no pie.
during ./configure:

checking for __attribute__((warn_unused_result))... yes
checking for LC_MESSAGES... yes
checking for localeconv... yes
checking for pkg-config... /usr/bin/pkg-config
checking for libevent... yes
checking MOZ_LIBEVENT_CFLAGS...
checking MOZ_LIBEVENT_LIBS... -levent
checking for YASM assembler... checking for yasm... yasm
checking for jpeg_destroy_compress in -ljpeg... yes
configure: error: Insufficient JPEG library version for --with-system-jpeg
------ config.log ------
^
In file included from configure:15341:
/usr/include/sys/types.h:98:17: error: cannot combine with previous 'type-name' declaration specifier
typedef __pid_t pid_t;
^
./confdefs.h:12:15: note: expanded from macro 'pid_t'
#define pid_t int
^
3 errors generated.
configure: failed program was:
#line 15339 "configure"
#include "confdefs.h"
#include <stdio.h>
#include <sys/types.h>
#include <jpeglib.h>
int main() {
#if JPEG_LIB_VERSION < 62
#error "Insufficient JPEG library version (62 required)."
#endif
#ifndef JCS_EXTENSIONS
#error "libjpeg-turbo JCS_EXTENSIONS required"
#endif

; return 0; }
configure: error: Insufficient JPEG library version for --with-system-jpeg
*** Fix above errors and then restart with\
"make -f client.mk build"
/tmp/makepkg/firefox/src/mozilla-release/client.mk:363: recipe for target 'configure' failed
make[2]: *** [configure] Error 1
make[2]: Leaving directory '/tmp/makepkg/firefox/src/mozilla-release'
/tmp/makepkg/firefox/src/mozilla-release/client.mk:377: recipe for target 'obj-x86_64-unknown-linux-gnu/Makefile' failed
make[1]: *** [obj-x86_64-unknown-linux-gnu/Makefile] Error 2
make[1]: Leaving directory '/tmp/makepkg/firefox/src/mozilla-release'
client.mk:187: recipe for target 'build' failed
make: *** [build] Error 2
==> ERROR: A failure occurred in build().
Aborting...