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diff -Nrup a/gcc/fortran/scanner.c b/gcc/fortran/scanner.c
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--- a/gcc/fortran/scanner.c 2017-03-08 12:35:48.000000000 -0500
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+++ b/gcc/fortran/scanner.c 2018-05-03 19:01:52.000000000 -0400
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@@ -2097,6 +2097,10 @@ preprocessor_line (gfc_char_t *c)
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in the linemap. Alternative could be using GC or updating linemap to
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point to the new name, but there is no API for that currently. */
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current_file->filename = xstrdup (filename);
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+
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+ /* We need to tell the linemap API that the filename changed. Just
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+ changing current_file is insufficient. */
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+ linemap_add (line_table, LC_RENAME, false, current_file->filename, line);
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}
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/* Set new line number. */
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diff -Nrup a/gcc/testsuite/gfortran.dg/linefile.f90 b/gcc/testsuite/gfortran.dg/linefile.f90
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--- a/gcc/testsuite/gfortran.dg/linefile.f90 1969-12-31 19:00:00.000000000 -0500
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+++ b/gcc/testsuite/gfortran.dg/linefile.f90 2018-05-07 13:34:22.000000000 -0400
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@@ -0,0 +1,18 @@
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+! { dg-do compile }
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+! { dg-options "-Wall" }
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+
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+! This will verify that the # <line> <file> directive later does not
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+! mess up the diagnostic on this line
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+SUBROUTINE s(dummy) ! { dg-warning "Unused" }
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+ INTEGER, INTENT(in) :: dummy
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+END SUBROUTINE
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+
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+# 12345 "foo-f"
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+SUBROUTINE s2(dummy)
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+ INTEGER, INTENT(in) :: dummy
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+END SUBROUTINE
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+! We want to check that the # directive changes the filename in the
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+! diagnostic. Nothing else really matters here. dg-regexp allows us
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+! to see the entire diagnostic. We just have to make sure to consume
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+! the entire message.
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+! { dg-regexp "foo-f\[^\n]*" }
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