Re-apply r246276 - Object: Teach llvm-ar to create symbol table for COFF short import files

This patch includes a fix for a llvm-readobj test. With this patch, 
the tool does no longer print out COFF headers for the short import
file, but that's probably desirable because the header for the short
import file is dummy.

llvm-svn: 246283

3 files changed, 10 insertions, 0 deletions

diff --git a/llvm/test/Object/Inputs/coff-short-import-code b/llvm/test/Object/Inputs/coff-short-import-code
new file mode 100644
index 00000000000..446279037b5
--- /dev/null
+++ b/llvm/test/Object/Inputs/coff-short-import-code
diff --git a/llvm/test/Object/Inputs/coff-short-import-data b/llvm/test/Object/Inputs/coff-short-import-data
new file mode 100644
index 00000000000..71b635ba192
--- /dev/null
+++ b/llvm/test/Object/Inputs/coff-short-import-data
diff --git a/llvm/test/Object/archive-symtab.test b/llvm/test/Object/archive-symtab.test
index c50833d6a77..120401bad36 100644
--- a/llvm/test/Object/archive-symtab.test
+++ b/llvm/test/Object/archive-symtab.test
@@ -99,6 +99,16 @@ MACHO-NEXT: 0000000000000000 t _bar
 MACHO-NEXT: 0000000000000001 T _foo
 MACHO-NEXT: 0000000000000002 T _main
 
+RUN: rm -f %t.a
+RUN: llvm-ar --format=gnu rcsU %t.a %p/Inputs/coff-short-import-code %p/Inputs/coff-short-import-data
+RUN: llvm-nm -M %t.a | FileCheck --check-prefix=COFF-SHORT-IMPORT %s
+
+COFF-SHORT-IMPORT:      Archive map
+COFF-SHORT-IMPORT-NEXT: _foo in coff-short-import-code
+COFF-SHORT-IMPORT-NEXT: __imp__foo in coff-short-import-code
+COFF-SHORT-IMPORT-NEXT: _bar in coff-short-import-data
+COFF-SHORT-IMPORT-NOT:  __imp__bar in coff-short-import-data
+
 Test that we pad the symbol table so that it ends in a multiple of 4 bytes:
 8 + 60 + 36 == 104
 RUN: rm -f %t.a