I ran into a difference between the system and ports gcc. When using -fstack-protector the system gcc passes -lssp_nonshared to the linker and ports gcc doesn't, which causes the undefined reference below:
% cat test.c
int
main( void ) {
return( 0 );
}
% gcc46 -o test test.c -fstack-protector-all -fPIE
/var/tmp//ccjYQxKu.o: In function `main':
test.c:(.text+0x37): undefined reference to `__stack_chk_fail_local'
/usr/local/bin/ld: test: hidden symbol `__stack_chk_fail_local' isn't defined
/usr/local/bin/ld: final link failed: Bad value
collect2: ld returned 1 exit status
The ports gcc configure script detects __stack_chk_fail in our libc and
assumes libc provides everything, so I wonder if that's a wrong
assumption or if something's wrong in our ssp implementation.
The attached patch is a quick fix for lang/gcc46.
--- gcc/gcc.c.orig
+++ gcc/gcc.c
@@ -601,7 +601,7 @@
#ifndef LINK_SSP_SPEC
#ifdef TARGET_LIBC_PROVIDES_SSP
-#define LINK_SSP_SPEC "%{fstack-protector:}"
+#define LINK_SSP_SPEC
"%{fstack-protector|fstack-protector-all:-lssp_nonshared}"
#else
#define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all:-lssp_nonshared
-lssp}"
#endif
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