https://bugs.llvm.org/show_bug.cgi?id=38050
Bug ID: 38050
Summary: -fdebug-prefix-map is a no-op for .S files
Product: clang
Version: 6.0
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: star...@gmail.com
CC: llvm-bugs@lists.llvm.org
When compiling assembly (.S) files with `-g`, clang does not respect
-fdebug-prefix-map to change the embedded source file path information.
Example:
```lang=sh
echo 'int main() { return 0; }' > dummy.c
clang -S -c dummy.c -o dummy.S
# Works with .c
clang -fdebug-prefix-map=$PWD= -g -c dummy.c -o dummy
strings dummy | grep $PWD
# PWD was successfully remapped.
# Does not work with .S
clang -fdebug-prefix-map=$PWD= -g dummy.S -o dummy
strings dummy | grep $PWD
# PWD is embedded in the object file.
# gcc does it correctly.
gcc -fdebug-prefix-map=$PWD= -g dummy.S -o dummy
strings dummy | grep $PWD
# PWD was successfully remapped.
```
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