inglorion added inline comments.
================
Comment at: test/Frontend/preprocessed-input.c:3
+// RUN: %clang -emit-llvm -S -o - %t.i | FileCheck %s
+// CHECK: source_filename = {{.*}}preprocessed-input.c"{{$}}
----------------
Actually, I think you don't even have to run the preprocessor - you can just
put the file with the linemarker here and check that the name from the
linemarker is propagated, right?
Also, it seems that there is a similar issue to the one you're trying to fix
when going from .ll to .o (or .ll to .s, for that matter) - the name is taken
from the file you're reading from, not from the source_filename directive in
that file. Of course, that doesn't differ from gcc (given that gcc doesn't
handle .ll files), but you may want to address that, too, for consistency.
https://reviews.llvm.org/D30663
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