Do not enforce absolute path argv0 in windows

Even if we support no-canonical-prefix on
clang-cl(https://reviews.llvm.org/D47480), argv0 becomes absolute path
in clang-cl and that embeds absolute path in /showIncludes.

This patch removes such full path normalization from InitLLVM on
windows, and that removes absolute path from clang-cl output
(obj/stdout/stderr) when debug flag is disabled.

Patch by Takuto Ikuta!

Differential Revision https://reviews.llvm.org/D47578

llvm-svn: 334602

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/unittests/Support/CommandLineTest.cpp b/llvm/unittests/Support/CommandLineTest.cpp
index ba12c84..a296912 100644
--- a/llvm/unittests/Support/CommandLineTest.cpp
+++ b/llvm/unittests/Support/CommandLineTest.cpp
@@ -13,6 +13,7 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/Config/config.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/StringSaver.h"
@@ -821,4 +822,22 @@ TEST(CommandLineTest, PositionalEatArgsError) {
   EXPECT_TRUE(Errs.empty());
 }
 
+#ifdef _WIN32
+TEST(CommandLineTest, GetCommandLineArguments) {
+  int argc = __argc;
+  char **argv = __argv;
+
+  // GetCommandLineArguments is called in InitLLVM.
+  llvm::InitLLVM X(argc, argv);
+
+  EXPECT_EQ(llvm::sys::path::is_absolute(argv[0]),
+            llvm::sys::path::is_absolute(__argv[0]));
+
+  EXPECT_TRUE(llvm::sys::path::filename(argv[0])
+              .equals_lower("supporttests.exe"))
+      << "Filename of test executable is "
+      << llvm::sys::path::filename(argv[0]);
+}
+#endif
+
 }  // anonymous namespace