reproducer for module related breakage with pr-111852

Author: usx95

module_reproducer/another_lib.cppmap

@@ -0,0 +1,7 @@
+module "another_lib" {
+  export *
+  module "module_reproducer/another_lib.h" {
+    export *
+    header "module_reproducer/another_lib.h"
+  }
+}

module_reproducer/another_lib.h

@@ -0,0 +1,13 @@
+#ifndef ANOTHER_LIB_H_
+#define ANOTHER_LIB_H_
+
+#include "module_reproducer/deb_lib.h"
+
+namespace f {
+
+template <typename T>
+std::vector<T> A() {
+  return std::vector<T>{};
+}
+}  // namespace f
+#endif  // ANOTHER_LIB_H_

module_reproducer/another_lib2.cppmap

@@ -0,0 +1,7 @@
+module "another_lib2" {
+  export *
+  module "module_reproducer/another_lib.h" {
+    export *
+    header "module_reproducer/another_lib.h"
+  }
+}

module_reproducer/args.sh

@@ -0,0 +1,70 @@
+CLANG_BIN=/usr/local/google/home/usx/build/bin/clang++ \
+DEB_LIB_PCM=$(mktemp) \
+ANOTHER_LIB_PCM=$(mktemp) \
+ANOTHER_LIB_PCM2=$(mktemp) \
+&& \
+${CLANG_BIN} \
+-fno-exceptions \
+-funsigned-char \
+-fnew-alignment=8 \
+-fcoro-aligned-allocation \
+-fmodule-name=deb_lib \
+-Xclang=-fmodule-map-file-home-is-cwd \
+-xc++ \
+-Xclang=-emit-module \
+-pthread \
+-std=gnu++20 \
+-c \
+module_reproducer/deb_lib.cppmap \
+-o \
+${DEB_LIB_PCM} \
+&& \
+${CLANG_BIN} \
+-iquote \
+. \
+-fno-exceptions \
+-funsigned-char \
+-fnew-alignment=8 \
+-fcoro-aligned-allocation \
+-fmodule-name=another_lib \
+-Xclang=-fmodule-map-file-home-is-cwd \
+-xc++ \
+-Xclang=-emit-module \
+-Xclang=-fmodule-file=${DEB_LIB_PCM} \
+-pthread \
+-std=gnu++20 \
+-c \
+module_reproducer/another_lib.cppmap \
+-o \
+${ANOTHER_LIB_PCM} \
+&& \
+${CLANG_BIN} \
+-iquote \
+. \
+-fno-exceptions \
+-funsigned-char \
+-fnew-alignment=8 \
+-fcoro-aligned-allocation \
+-fmodule-name=another_lib2 \
+-Xclang=-fmodule-map-file-home-is-cwd \
+-xc++ \
+-Xclang=-emit-module \
+-Xclang=-fmodule-file=${ANOTHER_LIB_PCM} \
+-pthread \
+-std=gnu++20 \
+-c \
+module_reproducer/another_lib2.cppmap \
+-o \
+${ANOTHER_LIB_PCM2} \
+&& \
+${CLANG_BIN} \
+-iquote \
+. \
+-fno-exceptions \
+-funsigned-char \
+-fnew-alignment=8 \
+-fcoro-aligned-allocation \
+-Xclang=-fmodule-file=${ANOTHER_LIB_PCM2} \
+-pthread \
+-std=gnu++20 \
+module_reproducer/test_lib.cc

module_reproducer/deb_lib.cppmap

@@ -0,0 +1,7 @@
+module "deb_lib" {
+  export *
+  module "module_reproducer/deb_lib.h" {
+    export *
+    header "module_reproducer/deb_lib.h"
+  }
+}

module_reproducer/deb_lib.h

@@ -0,0 +1,19 @@
+#ifndef DEB_LIB_H_
+#define DEB_LIB_H_
+
+#include <vector>
+#include <string>
+
+namespace f {
+template <typename T>
+std::vector<T> A();
+
+template <typename T>
+class C {
+  template <typename V>
+  friend std::vector<V> A();
+};
+
+C<std::string> c;
+}  // namespace f
+#endif  // DEB_LIB_H_

module_reproducer/test_lib.cc

@@ -0,0 +1,5 @@
+#include "module_reproducer/another_lib.h"
+
+void momo() {
+  f::A<int>();
+}