[llvm-ar] Add some test-cases for empty archives

[bd1976llvm]

Summary

We had coverage of empty archive in our downstream testsuite.

This adds those cases upstream.

[MaskRay]

llvm/test/tools/llvm-ar/display-empty.test

13

Delete | tee %t1.log which is only for debugging

14

With tv, t coverage may be redundant.

llvm/test/tools/llvm-ar/print.test

93

Delete | tee %t1.log which is only for debugging

[bd1976llvm]

Arrg sorry! Uploaded an earlier incomplete revision by mistake.

• I removed the extract from empty thin archive test as you can't extract from thin archives.
• I addressed your review comments.

Thanks.

[gbreynoo]

LGTM

[MaskRay]

LGTM.

llvm/test/tools/llvm-ar/display-empty.test

+## Test Display of empty archives.
+
+# RUN: rm -rf %t && mkdir -p %t
+
+## Display empty archive:
+# RUN: llvm-ar cr %t/empty.a
+# RUN: llvm-ar tv %t/empty.a 2>&1 | count 0
+
+## Display empty thin archive:
+# RUN: llvm-ar Trc %t/thin-archive-empty.a
+# RUN: llvm-ar tv %t/thin-archive-empty.a 2>&1 | count 0

llvm/test/tools/llvm-ar/print.test

 ## Test Print output
 # XFAIL: system-darwin
 
 # RUN: rm -rf %t && mkdir -p %t
 # RUN: echo file1 > %t/1.txt
 # RUN: echo file2 > %t/2.txt
 # RUN: echo file3 > %t/3.txt
 
 # RUN: llvm-ar -rc %t/archive.a %t/1.txt %t/2.txt %t/3.txt
 
+## Print empty archive:
+# RUN: llvm-ar cr %t/empty.a
+# RUN: llvm-ar p %t/empty.a 2>&1 | count 0
+# RUN: llvm-ar pv %t/empty.a 2>&1 | count 0
+
 ## Print without member:
 # RUN: llvm-ar p %t/archive.a \
 # RUN:   | FileCheck %s --check-prefix=WITHOUT --match-full-lines --implicit-check-not {{.}}
 
 # WITHOUT:      file1
 # WITHOUT-NEXT: file2
 # WITHOUT-NEXT: file3
 

 # MISSING-ARCHIVE: error: unable to load '[[ARCHIVE]]': [[MSG]]
 
 ## Member does not exist:
 # RUN: not llvm-ar p %t/archive.a %t-missing.txt 2>&1 \
 # RUN:   | FileCheck %s --check-prefix=MISSING-FILE -DFILE=%t-missing.txt
 
 # MISSING-FILE: error: '[[FILE]]' was not found
 
+## Print empty thin archive:
+# RUN: llvm-ar Trc %t/thin-archive-empty.a
+# RUN: llvm-ar p %t/thin-archive-empty.a 2>&1 | count 0
+# RUN: llvm-ar pv %t/thin-archive-empty.a 2>&1 | count 0
+
 ## Print thin archive:
 # RUN: llvm-ar Trc %t/thin-archive.a %t/1.txt %t/2.txt %t/3.txt
 # RUN: llvm-ar p %t/archive.a %t/2.txt \
 # RUN:   | FileCheck %s --check-prefix=SINGLE --match-full-lines --implicit-check-not {{.}}