From 8098fe7244b72c066bad62178b5020a9e2491d2b Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Tue, 3 May 2022 18:11:08 +0300
Subject: Add some scaffolding needed for C++ modules in GCC.

Further work pending GCC bug #105467 and/or Ninja bug #1962.
---
 mesonbuild/backend/ninjabackend.py             |  2 ++
 test cases/unit/85 cpp modules/gcc/main.cpp    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/meson.build | 19 +++++++++++++++++++
 test cases/unit/85 cpp modules/gcc/src0.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src1.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src2.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src3.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src4.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src5.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src6.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src7.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src8.cxx    |  7 +++++++
 test cases/unit/85 cpp modules/gcc/src9.cxx    |  5 +++++
 test cases/unit/85 cpp modules/meson.build     |  2 ++
 14 files changed, 98 insertions(+)
 create mode 100644 test cases/unit/85 cpp modules/gcc/main.cpp
 create mode 100644 test cases/unit/85 cpp modules/gcc/meson.build
 create mode 100644 test cases/unit/85 cpp modules/gcc/src0.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src1.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src2.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src3.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src4.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src5.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src6.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src7.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src8.cxx
 create mode 100644 test cases/unit/85 cpp modules/gcc/src9.cxx

diff --git a/mesonbuild/backend/ninjabackend.py b/mesonbuild/backend/ninjabackend.py
index 1720138..35c14ee 100644
--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -913,6 +913,8 @@ class NinjaBackend(backends.Backend):
             return True
         if 'cpp' not in target.compilers:
             return False
+        if '-fmodules-ts' in target.extra_args.get('cpp', []):
+            return True
         # Currently only the preview version of Visual Studio is supported.
         cpp = target.compilers['cpp']
         if cpp.get_id() != 'msvc':
diff --git a/test cases/unit/85 cpp modules/gcc/main.cpp b/test cases/unit/85 cpp modules/gcc/main.cpp
new file mode 100644
index 0000000..d825c7d
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/main.cpp	
@@ -0,0 +1,7 @@
+import M0;
+#include<cstdio>
+
+int main() {
+    printf("The value is %d", func0());
+    return 0;
+}
diff --git a/test cases/unit/85 cpp modules/gcc/meson.build b/test cases/unit/85 cpp modules/gcc/meson.build
new file mode 100644
index 0000000..e405c56
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/meson.build	
@@ -0,0 +1,19 @@
+# GCC does not recognize .ixx as a C++ source extension so
+# we have to do this instead.
+
+e = executable('modtest',
+    'main.cpp',
+    'src0.cxx',
+    'src1.cxx',
+    'src2.cxx',
+    'src3.cxx',
+    'src4.cxx',
+    'src5.cxx',
+    'src6.cxx',
+    'src7.cxx',
+    'src8.cxx',
+    'src9.cxx',
+    cpp_args: ['-fmodules-ts'],
+    )
+
+test('modtest', e)
diff --git a/test cases/unit/85 cpp modules/gcc/src0.cxx b/test cases/unit/85 cpp modules/gcc/src0.cxx
new file mode 100644
index 0000000..3ca4d14
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src0.cxx	
@@ -0,0 +1,7 @@
+export module M0;
+
+import M1;
+
+export int func0() {
+  return func1();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src1.cxx b/test cases/unit/85 cpp modules/gcc/src1.cxx
new file mode 100644
index 0000000..cea6696
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src1.cxx	
@@ -0,0 +1,7 @@
+export module M1;
+
+import M2;
+
+export int func1() {
+  return func2();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src2.cxx b/test cases/unit/85 cpp modules/gcc/src2.cxx
new file mode 100644
index 0000000..415714c
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src2.cxx	
@@ -0,0 +1,7 @@
+export module M2;
+
+import M3;
+
+export int func2() {
+  return func3();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src3.cxx b/test cases/unit/85 cpp modules/gcc/src3.cxx
new file mode 100644
index 0000000..96f135c
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src3.cxx	
@@ -0,0 +1,7 @@
+export module M3;
+
+import M4;
+
+export int func3() {
+  return func4();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src4.cxx b/test cases/unit/85 cpp modules/gcc/src4.cxx
new file mode 100644
index 0000000..1ac1a6a
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src4.cxx	
@@ -0,0 +1,7 @@
+export module M4;
+
+import M5;
+
+export int func4() {
+  return func5();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src5.cxx b/test cases/unit/85 cpp modules/gcc/src5.cxx
new file mode 100644
index 0000000..96cf707
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src5.cxx	
@@ -0,0 +1,7 @@
+export module M5;
+
+import M6;
+
+export int func5() {
+  return func6();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src6.cxx b/test cases/unit/85 cpp modules/gcc/src6.cxx
new file mode 100644
index 0000000..760b71c
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src6.cxx	
@@ -0,0 +1,7 @@
+export module M6;
+
+import M7;
+
+export int func6() {
+  return func7();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src7.cxx b/test cases/unit/85 cpp modules/gcc/src7.cxx
new file mode 100644
index 0000000..8ce6608
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src7.cxx	
@@ -0,0 +1,7 @@
+export module M7;
+
+import M8;
+
+export int func7() {
+  return func8();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src8.cxx b/test cases/unit/85 cpp modules/gcc/src8.cxx
new file mode 100644
index 0000000..6a3ef96
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src8.cxx	
@@ -0,0 +1,7 @@
+export module M8;
+
+import M9;
+
+export int func8() {
+  return func9();
+}
diff --git a/test cases/unit/85 cpp modules/gcc/src9.cxx b/test cases/unit/85 cpp modules/gcc/src9.cxx
new file mode 100644
index 0000000..3ecb3be
--- /dev/null
+++ b/test cases/unit/85 cpp modules/gcc/src9.cxx	
@@ -0,0 +1,5 @@
+export module M9;
+
+export int func9() {
+  return 42;
+}
diff --git a/test cases/unit/85 cpp modules/meson.build b/test cases/unit/85 cpp modules/meson.build
index 3dd5033..579ea9b 100644
--- a/test cases/unit/85 cpp modules/meson.build	
+++ b/test cases/unit/85 cpp modules/meson.build	
@@ -4,6 +4,8 @@ cpp = meson.get_compiler('cpp')
 
 if cpp.get_id() == 'msvc'
     subdir('vs')
+elif cpp.get_id() == 'gcc'
+    subdir('gcc')
 else
     error('Unknown compiler')
 endif
-- 
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