Handle Fortran sources with dependencies to themselves.

ninjabackend.py

@@ -1012,6 +1012,11 @@ def get_fortran_deps(self, compiler, src, target):
                     raise InvalidArguments('Module %s in file %s not provided by any other source file.' %
                                            (usename, src))
                 mod_source_file = tdeps[usename]
+                # Check if a source uses a module it exports itself.
+                # Potential bug if multiple targets have a file with
+                # the same name.
+                if mod_source_file == os.path.split(src)[1]:
+                    continue
                 # WORKAROUND, we should set up a file level dependency to the
                 # module file and mark it as an output of this target. However
                 # we can't do that as Ninja does not support dependency tracking

test cases/fortran/4 self dependency/meson.build

@@ -0,0 +1,4 @@
+project('selfdep', 'fortran')
+
+e = executable('selfdep', 'selfdep.f90')
+test('selfdep', e)

test cases/fortran/4 self dependency/selfdep.f90

@@ -0,0 +1,11 @@
+MODULE Circle
+   REAL, PARAMETER :: Pi = 3.1415927
+   REAL :: radius
+END MODULE Circle
+
+PROGRAM prog
+
+use Circle
+IMPLICIT NONE
+
+END PROGRAM prog