std: Add libssp implementation for GNU/Windows targets

Unlike glibc and musl, MinGW provides no libssp symbols leading to
countless compile errors if FORTIFY_SOURCE is defined.

Add a (incomplete) implementation of libssp written in Zig so that
linking succeeds.

Closes #6492

1 files changed, 5 insertions, 1 deletions

diff --git a/src/link/Coff.zig b/src/link/Coff.zig
index 334492e164..3eb4d32c95 100644
--- a/src/link/Coff.zig
+++ b/src/link/Coff.zig
@@ -1117,11 +1117,15 @@ fn linkWithLLD(self: *Coff, comp: *Compilation) !void {
             try argv.append(comp.libunwind_static_lib.?.full_object_path);
         }
 
-        // compiler-rt and libc
+        // compiler-rt, libc and libssp
         if (is_exe_or_dyn_lib and !self.base.options.is_compiler_rt_or_libc) {
             if (!self.base.options.link_libc) {
                 try argv.append(comp.libc_static_lib.?.full_object_path);
             }
+            // MinGW doesn't provide libssp symbols
+            if (target.abi.isGnu()) {
+                try argv.append(comp.libssp_static_lib.?.full_object_path);
+            }
             // MSVC compiler_rt is missing some stuff, so we build it unconditionally but
             // and rely on weak linkage to allow MSVC compiler_rt functions to override ours.
             try argv.append(comp.compiler_rt_static_lib.?.full_object_path);