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

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On Thu, 2020-07-09 at 00:07 +0200, Sandro Mani wrote:
> 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

Perhaps mingw-crt should be built with -fno-stack-protector?

> 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.
> 
> [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

-- 
Yaakov Selkowitz
Senior Software Engineer - Platform Enablement
Red Hat, Inc.

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