================
@@ -2301,11 +2301,31 @@ are listed below.
When enabled, allows the compiler to assume that each object file
passed to the linker has been compiled using a unique source file
- name. This is useful for reducing link times when doing ThinLTO
+ path. This is useful for reducing link times when doing ThinLTO
in combination with whole-program devirtualization or CFI.
- A misuse of this flag will generally result in a duplicate symbol
- error at link time.
+ The full source path passed to the compiler must be unique. This
+ means that, for example, the following is a usage error:
+
+ .. code-block:: console
+
+ $ cd foo
+ $ clang -funique-source-file-names -c foo.c
+ $ cd ../bar
+ $ clang -funique-source-file-names -c foo.c
+ $ cd ..
+ $ clang foo/foo.o bar/foo.o
+
+ but this is not:
+
+ .. code-block:: console
+
+ $ clang -funique-source-file-names -c foo/foo.c
+ $ clang -funique-source-file-names -c bar/foo.c
+ $ clang foo/foo.o bar/foo.o
+
+ A misuse of this flag will generally either be harmless or result
----------------
pcc wrote:
Done
https://github.com/llvm/llvm-project/pull/135832
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