[llvm-ar] Support multiple dashed options

This allows syntax like:
$ llvm-ar -c -r -u file.a file.o

This is in addition to the other formats that are already supported:
$ llvm-ar cru file.a file.o
$ llvm-ar -cru file.a file.o

Patch by Tom Anderson!

Differential Revision: https://reviews.llvm.org/D44452

llvm-svn: 328716

1 files changed, 13 insertions, 9 deletions

diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index b3b812daae2..28955e18357 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -35,15 +35,6 @@
 
 using namespace llvm;
 
-// The SYM64 format is used when an archive's member offsets are larger than
-// 32-bits can hold. The need for this shift in format is detected by
-// writeArchive. To test this we need to generate a file with a member that has
-// an offset larger than 32-bits but this demands a very slow test. To speed
-// the test up we use this flag to pretend like the cutoff happens before
-// 32-bits and instead happens at some much smaller value.
-static cl::opt<int> Sym64Threshold("sym64-threshold", cl::Hidden,
-                                   cl::init(32));
-
 NewArchiveMember::NewArchiveMember(MemoryBufferRef BufRef)
     : Buf(MemoryBuffer::getMemBuffer(BufRef, false)),
       MemberName(BufRef.getBufferIdentifier()) {}
@@ -490,6 +481,19 @@ Error llvm::writeArchive(StringRef ArcName,
       // We assume 32-bit symbols to see if 32-bit symbols are possible or not.
       MaxOffset += M.Symbols.size() * 4;
     }
+
+    // The SYM64 format is used when an archive's member offsets are larger than
+    // 32-bits can hold. The need for this shift in format is detected by
+    // writeArchive. To test this we need to generate a file with a member that
+    // has an offset larger than 32-bits but this demands a very slow test. To
+    // speed the test up we use this environment variable to pretend like the
+    // cutoff happens before 32-bits and instead happens at some much smaller
+    // value.
+    const char *Sym64Env = std::getenv("SYM64_THRESHOLD");
+    int Sym64Threshold = 32;
+    if (Sym64Env)
+      StringRef(Sym64Env).getAsInteger(10, Sym64Threshold);
+
     // If LastOffset isn't going to fit in a 32-bit varible we need to switch
     // to 64-bit. Note that the file can be larger than 4GB as long as the last
     // member starts before the 4GB offset.