[llvm-bugs] [Bug 37530] New: llvm-ar doesn't produce valid thin archives when combining multiple .a

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37530

            Bug ID: 37530
           Summary: llvm-ar doesn't produce valid thin archives when
                    combining multiple .a
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-ar
          Assignee: unassignedbugs at nondot.org
          Reporter: dima at golovin.in
                CC: llvm-bugs at lists.llvm.org

Created attachment 20322
  --> https://bugs.llvm.org/attachment.cgi?id=20322&action=edit
resulting test2.a archive using llvm-ar

The behavior of llvm-ar is not the same with GNU ar (from GNU binutils).

To reproduce this:

1. create two empty objects:

    clang -c -x c /dev/null -o test1.o
    clang -c -x c /dev/null -o test2.o

2. archive the first object:

    llvm-ar rcSTD test1.a test1.o

3. archive the second object together with the first archive:

    llvm-ar rcsTD test2.a test2.o test1.a

4. check archive's contents:

    llvm-ar t test2.a

Expected result:

test2.o and test1.o are in the archive

Actual result:

test2.o and test1.a are in the archive

If you use GNU ar instead of llvm-ar, you will get the expected result.

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