mingw GCC help needed: -fstack-protector and -lssp, undefined reference to `__strcpy_chk'

[Sandro Mani <manisandro@xxxxxxxxx>]

Hi

I'm working on updating the mingw toolchain [1], and am hitting the 
situation [2] where I build with -fstack-protector in the ldflags, can 
confirm that -lssp and -lssp_nonshared are automatically added to the 
ldflags (seen via gcc -v [3] and strace), but I still get i.e. with this 
minimal testcase:

#include <dirent.h>
int main () {
    return closedir (NULL);
}

$ i686-w64-mingw32-gcc -o test.exe test.c -fstack-protector
/usr/lib/gcc/i686-w64-mingw32/10.1.1/../../../../i686-w64-mingw32/bin/ld: 
/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib/libmingwex.a(lib32_libmingwex_a-dirent.o):(.text+0x22f): 
undefined reference to `__strcpy_chk'
collect2: error: ld returned 1 exit status

OTOH, if I write

$ i686-w64-mingw32-gcc -o test.exe test.c -fstack-protector 
/usr/i686-w64-mingw32/sys-root/mingw/bin/libssp-0.dll

it links correctly.

The only other thing which came to mind to verify is that the import 
library references the correct dll, and this appears to be the case:

$ i686-w64-mingw32-dlltool -I 
/usr/i686-w64-mingw32/sys-root/mingw/lib/libssp.dll.a
libssp-0.dll

I'd appreciate any pointers as I'm pretty much in the dark here.

Thanks
Sandro


[1] https://copr.fedorainfracloud.org/coprs/smani/mingw-7.0.0/builds/

[2] Specifically when building mingw-gdb, which adds 
-D_FORTIFY_SOURCES=2 internally, hence adding -fstack-protector to the 
ldflags

[3] I.e. I gtt COLLECT_GCC_OPTIONS='-v' '-o' 'test.exe' 
'-fstack-protector' '-mtune=generic' '-march=pentiumpro'
 /usr/libexec/gcc/i686-w64-mingw32/10.1.1/collect2 -plugin 
/usr/libexec/gcc/i686-w64-mingw32/10.1.1/liblto_plugin.so 
-plugin-opt=/usr/libexec/gcc/i686-w64-mingw32/10.1.1/lto-wrapper 
-plugin-opt=-fresolution=/tmp/cckKHr8u.res 
-plugin-opt=-pass-through=-lmingw32 -plugin-opt=-pass-through=-lgcc 
-plugin-opt=-pass-through=-lgcc_eh -plugin-opt=-pass-through=-lmoldname 
-plugin-opt=-pass-through=-lmingwex -plugin-opt=-pass-through=-lmsvcrt 
-plugin-opt=-pass-through=-lpthread -plugin-opt=-pass-through=-ladvapi32 
-plugin-opt=-pass-through=-lshell32 -plugin-opt=-pass-through=-luser32 
-plugin-opt=-pass-through=-lkernel32 -plugin-opt=-pass-through=-lmingw32 
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_eh 
-plugin-opt=-pass-through=-lmoldname -plugin-opt=-pass-through=-lmingwex 
-plugin-opt=-pass-through=-lmsvcrt 
--sysroot=/usr/i686-w64-mingw32/sys-root -m i386pe -Bdynamic -o test.exe 
/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib/crt2.o 
/usr/lib/gcc/i686-w64-mingw32/10.1.1/crtbegin.o 
-L/usr/lib/gcc/i686-w64-mingw32/10.1.1 
-L/usr/lib/gcc/i686-w64-mingw32/10.1.1/../../../../i686-w64-mingw32/lib/../lib 
-L/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib 
-L/usr/lib/gcc/i686-w64-mingw32/10.1.1/../../../../i686-w64-mingw32/lib 
-L/usr/i686-w64-mingw32/sys-root/mingw/lib /tmp/ccpeowDx.o 
/usr/i686-w64-mingw32/sys-root/mingw/bin/libssp-0.dll -lssp_nonshared 
-lssp -lmingw32 -lgcc -lgcc_eh -lmoldname -lmingwex -lmsvcrt -lpthread 
-ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc -lgcc_eh 
-lmoldname -lmingwex -lmsvcrt /usr/lib/gcc/i686-w64-mingw32/10.1.1/crtend.o
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