[llvm-bugs] [Bug 32931] New: ELF LLD fails to handle multiple files in archives with the same name with ThinLTO

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32931

            Bug ID: 32931
           Summary: ELF LLD fails to handle multiple files in archives
                    with the same name with ThinLTO
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: peter at pcc.me.uk
                CC: llvm-bugs at lists.llvm.org

$ cat 1/foo.c
void f1() {}
$ cat 2/foo.c
void f2() {}
$ clang -flto=thin -c -o 1/foo.o 1/foo.c 
$ clang -flto=thin -c -o 2/foo.o 2/foo.c 
$ ar cru lib1.a 1/foo.o  # (where "ar" does not understand LLVM bitcode)
$ ar cru lib2.a 2/foo.o
$ clang -fuse-ld=lld -Wl,-uf1,-uf2 lib1.a lib2.a
ld.lld: error: Expected at most one ThinLTO module per bitcode file
clang-4.0: error: linker command failed with exit code 1 (use -v to see
invocation)

I think the fix is to make sure that the archive name and file offset is part
of the path that LLD passes through to the LTO API as we do for archive members
with symbol tables.

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