Fix Fortran dep scanner for upper case file extensions. Closes #8395.

mesonbuild/backend/ninjabackend.py

@@ -2523,7 +2523,7 @@ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47485'''))
         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']):
+        if not (extension.lower() 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)

test cases/fortran/2 modules/meson.build

@@ -3,6 +3,7 @@ project('modules', 'fortran',
 
 commented = library('commented', 'comment_mod.f90')
 
-e = executable('modprog', 'mymod.f90', 'prog.f90',
+# Have one file with an upper case file extension.
+e = executable('modprog', 'mymod.F90', 'prog.f90',
   link_with: commented)
 test('moduletest', e)