Use -Wno-error=trampolines

With gcc 4.9 we see

tst-execstack-mod.c: In function ‘tryme’:
tst-execstack-mod.c:16:8: error: trampoline generated for nested function ‘callback’ [-Werror=trampolines]
   void callback (void) { ok = true; }
           ^
	   cc1: all warnings being treated as errors

where of course the testcases require the use of trampolines.

ChangeLog

@@ -1,3 +1,9 @@
+2015-01-03  Richard Henderson  <rth@redhat.com>
+
+	* elf/Makefile (CFLAGS-tst-execstack-mod.c): Add -Wno-error=trapolines
+	(CFLAGS-tst-execstack-prog.c): Likewise.
+	* nptl/Makefile (CFLAGS-tst-execstack-mod.c): Likewise.
+
 2015-01-02  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #17748]

elf/Makefile

@@ -861,6 +861,8 @@ $(objpfx)tst-execstack-needed: $(objpfx)tst-execstack-mod.so
 LDFLAGS-tst-execstack-needed = -Wl,-z,noexecstack
 
 LDFLAGS-tst-execstack-prog = -Wl,-z,execstack
+CFLAGS-tst-execstack-prog.c += -Wno-error=trampolines
+CFLAGS-tst-execstack-mod.c += -Wno-error=trampolines
 endif
 
 LDFLAGS-tst-array2 = $(no-as-needed)

nptl/Makefile

@@ -619,6 +619,7 @@ tst-exec4-ARGS = $(host-test-program-cmd)
 $(objpfx)tst-execstack: $(libdl)
 $(objpfx)tst-execstack.out: $(objpfx)tst-execstack-mod.so
 LDFLAGS-tst-execstack = -Wl,-z,noexecstack
+CFLAGS-tst-execstack-mod.c += -Wno-error=trampolines
 
 $(objpfx)tst-fini1mod.so: $(shared-thread-library)