1 files changed, 52 insertions, 0 deletions
diff --git a/test/COFF/gnu-weak.test b/test/COFF/gnu-weak.test
new file mode 100644
index 000000000000..20284d7f0243
--- /dev/null
+++ b/test/COFF/gnu-weak.test
@@ -0,0 +1,52 @@
+RUN: lld-link -lldmingw %S/Inputs/gnu-weak.o %S/Inputs/gnu-weak2.o -out:%t.exe
+
+GNU ld can handle several definitions of the same weak symbol, and
+unless there is a strong definition of it, it just picks the first
+weak definition encountered.
+
+For each of the weak definitions, GNU tools produce a regular symbol
+named .weak.<weaksymbol>.<othersymbol>, where the other symbol name is
+another symbol defined close by.
+
+This can't be reproduced by assembling with llvm-mc, as llvm-mc always
+produces similar regular symbols named .weak.<weaksymbol>.default.
+
+The bundled object files can be produced from test code that looks like
+this:
+
+$ cat gnu-weak.c
+void weakfunc(void) __attribute__((weak));
+void otherfunc(void);
+
+__attribute__((weak)) void weakfunc() {
+}
+
+int main(int argc, char* argv[]) {
+    otherfunc();
+    weakfunc();
+    return 0;
+}
+void mainCRTStartup(void) {
+    main(0, (char**)0);
+}
+void __main(void) {
+}
+
+$ cat gnu-weak2.c
+void weakfunc(void) __attribute__((weak));
+
+__attribute__((weak)) void weakfunc() {
+}
+
+void otherfunc(void) {
+}
+
+$ x86_64-w64-mingw32-gcc -c -O2 gnu-weak.c
+$ x86_64-w64-mingw32-gcc -c -O2 gnu-weak2.c
+
+$ x86_64-w64-mingw32-nm gnu-weak.o | grep weakfunc
+0000000000000000 T .weak.weakfunc.main
+                 w weakfunc
+$ x86_64-w64-mingw32-nm gnu-weak2.o | grep weakfunc
+0000000000000000 T .weak.weakfunc.otherfunc
+                 w weakfunc