Fix combining C and Fortran. Closes #8377.

mesonbuild/backend/ninjabackend.py

@@ -2513,15 +2513,18 @@ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47485'''))
         element.add_item('DEPFILE', dep_file)
         element.add_item('ARGS', commands)
 
-        self.add_dependency_scanner_entries_to_element(target, compiler, element)
+        self.add_dependency_scanner_entries_to_element(target, compiler, element, src)
         self.add_build(element)
         assert(isinstance(rel_obj, str))
         assert(isinstance(rel_src, str))
         return (rel_obj, rel_src.replace('\\', '/'))
 
-    def add_dependency_scanner_entries_to_element(self, target, compiler, element):
+    def add_dependency_scanner_entries_to_element(self, target, compiler, element, src):
         if not self.should_use_dyndeps_for_target(target):
             return
+        extension = os.path.splitext(src.fname)[1][1:]
+        if not (extension in compilers.lang_suffixes['fortran'] or extension in compilers.lang_suffixes['cpp']):
+            return
         dep_scan_file = self.get_dep_scan_file_for(target)
         element.add_item('dyndep', dep_scan_file)
         element.add_orderdep(dep_scan_file)

test cases/fortran/9 cpp/main.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+double fortran(void);
+
+int main(void) {
+    printf("FORTRAN gave us this number: %lf.\n", fortran());
+    return 0;
+}

test cases/fortran/9 cpp/meson.build

@@ -1,4 +1,4 @@
-project('C++ and FORTRAN', 'cpp', 'fortran')
+project('C, C++ and Fortran', 'c', 'cpp', 'fortran')
 
 cpp = meson.get_compiler('cpp')
 fc = meson.get_compiler('fortran')
@@ -17,9 +17,17 @@ if fc.get_id() == 'intel'
 endif
 
 e = executable(
+  'cfort',
+  ['main.c', 'fortran.f'],
+  dependencies : link_with,
+)
+
+test('C and Fortran', e)
+
+e2 = executable(
   'cppfort',
   ['main.cpp', 'fortran.f'],
   dependencies : link_with,
 )
 
-test('C++ FORTRAN', e)
+test('C++ and Fortran', e2)