Test the 'u' option of llvm-ar

RUN: cd %T
RUN: rm -f %t.a

Create a file named evenlen that is newer than the evenlen on the source dir.
RUN: mkdir -p %t.older
RUN: echo older > %t.older/evenlen

Either the shell supports the 'touch' command with a flag to manually set the
mtime or we sleep for over two seconds so that the mtime is definitely
observable.
RUN: touch -m -t 200001010000 %t.older/evenlen || sleep 2.1

RUN: mkdir -p %t.newer
RUN: echo newer > %t.newer/evenlen
RUN: touch %t.newer/evenlen

Create an achive with the newest file
RUN: llvm-ar rU %t.a %t.newer/evenlen
RUN: llvm-ar p %t.a | FileCheck --check-prefix=NEWER %s

Check that without the 'u' option the member is replaced with an older file.
RUN: llvm-ar rU %t.a %t.older/evenlen
RUN: llvm-ar p %t.a | FileCheck --check-prefix=OLDER %s

Check that with the 'u' option the member is replaced with a newer file.
RUN: llvm-ar ruU %t.a %t.newer/evenlen
RUN: llvm-ar p %t.a | FileCheck --check-prefix=NEWER %s

Check that with the 'u' option the member is not replaced with an older file.
RUN: llvm-ar ruU %t.a %t.older/evenlen
RUN: llvm-ar p %t.a | FileCheck --check-prefix=NEWER %s

NEWER: newer
OLDER: older