I've worked around this for now by symlinking bin/libssp-0.dll over lib/libssp.dll.a, not having any other ideas. I've also added -fstack-protector to the mingwXX_ldflags, as the mingwXX_cflags contain -D_FORTIFY_SOURCES=2.

So now the toolchain update is pushed, I'll keep an eye on failures during the upcoming mass rebuild.

Sandro

On 09.07.20 14:36, Yaakov Selkowitz wrote:

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