1 files changed, 73 insertions, 0 deletions
diff --git a/test/COFF/associative-comdat-mingw.s b/test/COFF/associative-comdat-mingw.s
new file mode 100644
index 0000000000000..09cba9c4c6f7b
--- /dev/null
+++ b/test/COFF/associative-comdat-mingw.s
@@ -0,0 +1,73 @@
+# REQUIRES: x86
+
+# RUN: llvm-mc -triple=x86_64-windows-gnu %s -filetype=obj -o %t1.obj
+# RUN: llvm-mc -triple=x86_64-windows-gnu %S/Inputs/associative-comdat-mingw-2.s -filetype=obj -o %t2.obj
+
+# RUN: lld-link -lldmingw -entry:main %t1.obj %t2.obj -out:%t.gc.exe -verbose
+# RUN: llvm-readobj -sections %t.gc.exe | FileCheck %s
+
+# CHECK: Sections [
+# CHECK:   Section {
+# CHECK:     Number: 2
+# CHECK-LABEL:     Name: .rdata (2E 72 64 61 74 61 00 00)
+#             This is the critical check to show that only *one* definition of
+#             .xdata$foo was retained. This *must* be 4.
+#             Make sure that no other .xdata sections get included, which would
+#             increase the size here.
+# CHECK-NEXT:     VirtualSize: 0x4
+
+        .text
+        .def            main;
+        .scl            2;
+        .type           32;
+        .endef
+        .globl          main
+        .p2align        4, 0x90
+main:
+        call            foo
+        retq
+
+# Defines .text$foo (which has a leader symbol and is referenced like
+# normally), and .xdata$foo (which lacks a leader symbol, which normally
+# would be declared associative to the symbol foo).
+# .xdata$foo should be implicitly treated as associative to foo and brought
+# in, while .xdata$bar, implicitly associative to bar, not included, and
+# .xdata$baz not included since there's no symbol baz.
+
+# GNU binutils ld doesn't do this at all, but always includes all .xdata/.pdata
+# comdat sections, even if --gc-sections is used.
+
+        .section        .xdata$foo,"dr"
+        .linkonce       discard
+        .p2align        3
+        .long           42
+
+        .section        .xdata$bar,"dr"
+        .linkonce       discard
+        .p2align        3
+        .long           43
+
+        .section        .xdata$baz,"dr"
+        .linkonce       discard
+        .p2align        3
+        .long           44
+
+        .def            foo;
+        .scl            2;
+        .type           32;
+        .endef
+        .section        .text$foo,"xr",discard,foo
+        .globl          foo
+        .p2align        4
+foo:
+        ret
+
+        .def            bar;
+        .scl            2;
+        .type           32;
+        .endef
+        .section        .text$bar,"xr",discard,bar
+        .globl          bar
+        .p2align        4
+bar:
+        ret