[gcc r15-2005] c++/modules: Add testcase for fixed issue with usings [PR115798]

[Nathaniel Shead via Gcc-cvs]

https://gcc.gnu.org/g:13757e50ff0b4e0dccfabc67b1322a2724bf3a5c

commit r15-2005-g13757e50ff0b4e0dccfabc67b1322a2724bf3a5c
Author: Nathaniel Shead <nathanielosh...@gmail.com>
Date:   Fri Jul 12 22:59:19 2024 +1000

    c++/modules: Add testcase for fixed issue with usings [PR115798]
    
    This issue was fixed by r15-2003-gd6bf4b1c932211, but seems worth adding
    to the testsuite.
    
            PR c++/115798
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/modules/using-26_a.C: New test.
            * g++.dg/modules/using-26_b.C: New test.
            * g++.dg/modules/using-26_c.C: New test.
    
    Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com>

Diff:
---
 gcc/testsuite/g++.dg/modules/using-26_a.C | 15 +++++++++++++++
 gcc/testsuite/g++.dg/modules/using-26_b.C | 10 ++++++++++
 gcc/testsuite/g++.dg/modules/using-26_c.C |  9 +++++++++
 3 files changed, 34 insertions(+)

diff --git a/gcc/testsuite/g++.dg/modules/using-26_a.C 
b/gcc/testsuite/g++.dg/modules/using-26_a.C
new file mode 100644
index 000000000000..adab83d42433
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/using-26_a.C
@@ -0,0 +1,15 @@
+// PR c++/115798
+// { dg-additional-options "-fmodules-ts" }
+// { dg-module-cmi base }
+
+module;
+#include <cstdint>
+export module base;
+
+export {
+  using ::int8_t;
+}
+
+export namespace std {
+  using std::int8_t;
+}
diff --git a/gcc/testsuite/g++.dg/modules/using-26_b.C 
b/gcc/testsuite/g++.dg/modules/using-26_b.C
new file mode 100644
index 000000000000..06ed599df41e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/using-26_b.C
@@ -0,0 +1,10 @@
+// PR c++/115798
+// { dg-additional-options "-fmodules-ts" }
+// { dg-module-cmi xstd }
+
+export module xstd;
+import base;
+
+export namespace std {
+  using std::int8_t;
+}
diff --git a/gcc/testsuite/g++.dg/modules/using-26_c.C 
b/gcc/testsuite/g++.dg/modules/using-26_c.C
new file mode 100644
index 000000000000..68f45cacb82e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/using-26_c.C
@@ -0,0 +1,9 @@
+// PR c++/115798
+// { dg-additional-options "-fmodules-ts" }
+
+import xstd;
+import base;
+
+int main() {
+  static_assert(__is_same(int8_t, std::int8_t));
+}