archlinux skylight compile issue

mkmf.log

find_header: checking for skylight_dlopen.h in /home/zor/.gem/ruby/2.3.0/gems/skylight-0.10.5/ext... -------------------- yes

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FORTIFY_SOURCE=2   -Wno-error=pedantic conftest.c  -L. -L/usr/lib -L. -Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby  -lpthread -lgmp -ldl -lcrypt -lm   -lc"
In file included from /usr/include/stdio.h:27:0,
                 from /usr/include/ruby-2.3.0/ruby/defines.h:26,
                 from /usr/include/ruby-2.3.0/ruby/ruby.h:36,
                 from /usr/include/ruby-2.3.0/ruby.h:33,
                 from conftest.c:1:
/usr/include/features.h:331:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^~~~~~~
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

"gcc -E -I/usr/include/ruby-2.3.0/x86_64-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FORTIFY_SOURCE=2   -Wno-error=pedantic  conftest.c -o conftest.i"
In file included from /usr/include/stdio.h:27:0,
                 from /usr/include/ruby-2.3.0/ruby/defines.h:26,
                 from /usr/include/ruby-2.3.0/ruby/ruby.h:36,
                 from /usr/include/ruby-2.3.0/ruby.h:33,
                 from conftest.c:1:
/usr/include/features.h:331:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^~~~~~~
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <skylight_dlopen.h>
/* end */

--------------------

have_header: checking for dlfcn.h... -------------------- yes

"gcc -E -I/usr/include/ruby-2.3.0/x86_64-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FORTIFY_SOURCE=2   -Wno-error=pedantic  conftest.c -o conftest.i"
In file included from /usr/include/stdio.h:27:0,
                 from /usr/include/ruby-2.3.0/ruby/defines.h:26,
                 from /usr/include/ruby-2.3.0/ruby/ruby.h:36,
                 from /usr/include/ruby-2.3.0/ruby.h:33,
                 from conftest.c:1:
/usr/include/features.h:331:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^~~~~~~
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <dlfcn.h>
/* end */

--------------------

have_func: checking for rb_thread_call_without_gvl() in ruby/thread.h... -------------------- yes

"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FORTIFY_SOURCE=2   -Wno-error=pedantic conftest.c  -L. -L/usr/lib -L. -Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby  -lpthread -lgmp -ldl -lcrypt -lm   -lc"
In file included from /usr/include/stdio.h:27:0,
                 from /usr/include/ruby-2.3.0/ruby/defines.h:26,
                 from /usr/include/ruby-2.3.0/ruby/ruby.h:36,
                 from /usr/include/ruby-2.3.0/ruby.h:33,
                 from conftest.c:1:
/usr/include/features.h:331:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^~~~~~~
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <ruby/thread.h>
 4: 
 5: /*top*/
 6: extern int t(void);
 7: int main(int argc, char **argv)
 8: {
 9:   if (argc > 1000000) {
10:     printf("%p", &t);
11:   }
12: 
13:   return 0;
14: }
15: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_thread_call_without_gvl; return !p; }
/* end */

--------------------

checking for fast thread local storage... -------------------- no

"gcc -I/usr/include/ruby-2.3.0/x86_64-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FORTIFY_SOURCE=2   -Wno-error=pedantic -Werror   -c conftest.c"
In file included from /usr/include/stdio.h:27:0,
                 from /usr/include/ruby-2.3.0/ruby/defines.h:26,
                 from /usr/include/ruby-2.3.0/ruby/ruby.h:36,
                 from /usr/include/ruby-2.3.0/ruby.h:33,
                 from conftest.c:1:
/usr/include/features.h:331:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^~~~~~~
cc1: all warnings being treated as errors
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: __thread int foo;
/* end */

--------------------