Genex: Per-source $<COMPILE_LANGUAGE:...> support

Fixes: #17542

3 files changed, 32 insertions, 0 deletions

diff --git a/Tests/GeneratorExpression/CMakeLists.txt b/Tests/GeneratorExpression/CMakeLists.txt
index 5165970..0585d0c 100644
--- a/Tests/GeneratorExpression/CMakeLists.txt
+++ b/Tests/GeneratorExpression/CMakeLists.txt
@@ -263,9 +263,17 @@ add_custom_target(check-part4 ALL
 add_executable(srcgenex_flags srcgenex_flags.c)
 set_property(SOURCE srcgenex_flags.c PROPERTY COMPILE_FLAGS "-DNAME=$<TARGET_PROPERTY:NAME>")
 
+add_executable(srcgenex_flags_COMPILE_LANGUAGE srcgenex_flags_COMPILE_LANGUAGE.c)
+set_property(SOURCE srcgenex_flags_COMPILE_LANGUAGE.c PROPERTY COMPILE_FLAGS "$<$<COMPILE_LANGUAGE:C>:-DNAME=$<TARGET_PROPERTY:NAME>>")
+
 add_executable(srcgenex_defs srcgenex_defs.c)
 set_property(SOURCE srcgenex_defs.c PROPERTY COMPILE_DEFINITIONS NAME=$<TARGET_PROPERTY:NAME>)
 
+if (CMAKE_GENERATOR MATCHES "Makefiles|Ninja|Watcom WMake")
+  add_executable(srcgenex_defs_COMPILE_LANGUAGE srcgenex_defs_COMPILE_LANGUAGE.c)
+  set_property(SOURCE srcgenex_defs_COMPILE_LANGUAGE.c PROPERTY COMPILE_DEFINITIONS $<$<COMPILE_LANGUAGE:C>:NAME=$<TARGET_PROPERTY:NAME>>)
+endif()
+
 #-----------------------------------------------------------------------------
 # Cover test properties with generator expressions.
 add_executable(echo echo.c)
diff --git a/Tests/GeneratorExpression/srcgenex_defs_COMPILE_LANGUAGE.c b/Tests/GeneratorExpression/srcgenex_defs_COMPILE_LANGUAGE.c
new file mode 100644
index 0000000..421b55b
--- /dev/null
+++ b/Tests/GeneratorExpression/srcgenex_defs_COMPILE_LANGUAGE.c
@@ -0,0 +1,12 @@
+int srcgenex_defs_COMPILE_LANGUAGE(void)
+{
+  return 0;
+}
+
+int main(int argc, char* argv[])
+{
+#ifndef NAME
+#error NAME not defined
+#endif
+  return NAME();
+}
diff --git a/Tests/GeneratorExpression/srcgenex_flags_COMPILE_LANGUAGE.c b/Tests/GeneratorExpression/srcgenex_flags_COMPILE_LANGUAGE.c
new file mode 100644
index 0000000..4e80d6e
--- /dev/null
+++ b/Tests/GeneratorExpression/srcgenex_flags_COMPILE_LANGUAGE.c
@@ -0,0 +1,12 @@
+int srcgenex_flags_COMPILE_LANGUAGE(void)
+{
+  return 0;
+}
+
+int main(int argc, char* argv[])
+{
+#ifndef NAME
+#error NAME not defined
+#endif
+  return NAME();
+}