Add glob pattern unittest

Author: DKLoehr

llvm/lib/Support/GlobPattern.cpp

@@ -137,7 +137,7 @@ GlobPattern::create(StringRef S, std::optional<size_t> MaxSubPatterns) {
   GlobPattern Pat;
 
   // Store the prefix that does not contain any metacharacter.
-  size_t PrefixSize = S.find_first_of("?*[{\\");
+  size_t PrefixSize = S.find_first_of("?*[{\\/");
   Pat.Prefix = S.substr(0, PrefixSize);
   if (PrefixSize == std::string::npos)
     return Pat;

llvm/unittests/Support/GlobPatternTest.cpp

@@ -271,4 +271,13 @@ TEST_F(GlobPatternTest, Pathological) {
   EXPECT_FALSE(Pat->match(S));
   EXPECT_TRUE(Pat->match(S + 'b'));
 }
+
+TEST_F(GlobPatternTest, SlashAgnostic) {
+  auto Pat = GlobPattern::create("clang/*");
+  ASSERT_TRUE((bool)Pat);
+  EXPECT_TRUE(Pat->match("clang/foo"));
+  EXPECT_FALSE(Pat->match(R"(clang\foo)"));
+  EXPECT_TRUE(Pat->match("clang/foo", /*isSlashAgnostic=*/true));
+  EXPECT_TRUE(Pat->match(R"(clang\foo)", /*isSlashAgnostic=*/true));
+}
 }