[cfe-dev] Duplicate .file in debug information when clang is called with full path

[Yaron Keren]

When compiling a trivial main.cpp with latest clang on  Windows 7,

clang -S c:\llvm\test\main.cpp -g -std=c++1y -target i686-pc-mingw32

main.cpp appears twice in the debug information in the assembly file, once
with back slash and once with forward slash:

Lsection_debug_loc:
 .text
Ltext_begin:
.data
 .file 1 "c:\\llvm\\test/main.cpp"
.file 2 "c:\\llvm\\test\\main.cpp"
 .def _main;

compiling with MingW gcc results in one file only.

Yaron
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