Show "Unknown -z option" error message even if --version or --help are given.

Previously, we validated -z options after we process --version or --help flags.
So, if one of these flags is given, we wouldn't show an "unknown -z option"
error. This patch fixes that behavior.

Differential Revision: https://reviews.llvm.org/D55446

llvm-svn: 353967

lld/ELF/Driver.cpp

@@ -370,6 +370,7 @@ void LinkerDriver::main(ArrayRef<const char *> ArgsArr) {
 
   // Interpret this flag early because error() depends on them.
   errorHandler().ErrorLimit = args::getInteger(Args, OPT_error_limit, 20);
+  checkZOptions(Args);
 
   // Handle -help
   if (Args.hasArg(OPT_help)) {
@@ -410,7 +411,6 @@ void LinkerDriver::main(ArrayRef<const char *> ArgsArr) {
   }
 
   readConfigs(Args);
-  checkZOptions(Args);
 
   // The behavior of -v or --version is a bit strange, but this is
   // needed for compatibility with GNU linkers.

lld/test/ELF/driver.test

@@ -60,6 +60,7 @@
 # ERR9: cannot open output file utput=/no/such/file
 
 # RUN: not ld.lld %t -z foo 2>&1 | FileCheck -check-prefix=ERR10 %s
+# RUN: not ld.lld %t -z foo --version 2>&1 | FileCheck -check-prefix=ERR10 %s
 # ERR10: unknown -z value: foo
 
 ## Check we report "unknown -z value" error even with -v.