Fix clazy-standalone with llvm-9

This is a temporary fix so it doesn't block distros from using clazy
with llvm-9. And I'm not even sure others can reproduce, as it
might be a local compiler bug here. Debugged it quite a bit and
couldn't reach any conclusion.

Nikolai, it would be great if you could run:
	 $ cd tests/
	 $ clazy-standalone auto-unexpected-qstringbuilder/main.cpp

after having uncommented:
// llvm::errs() << optionsParser.getSourcePathList().size() << "\n";
in ClazyStandaloneMain.cpp

should not print 0

CCMAIL: nikolai.kosjar@qt.io

1 files changed, 14 insertions, 1 deletions

diff --git a/src/ClazyStandaloneMain.cpp b/src/ClazyStandaloneMain.cpp
index cd471a7b..c678af9b 100644
--- a/src/ClazyStandaloneMain.cpp
+++ b/src/ClazyStandaloneMain.cpp
@@ -125,7 +125,20 @@ public:
 
 int main(int argc, const char **argv)
 {
-    CommonOptionsParser optionsParser(argc, argv, s_clazyCategory, cl::ZeroOrMore);
+#if LLVM_VERSION_MAJOR >= 9
+    /* HACK: cl::ZeroOrMore makes clazy-standalone stop working for some reason (with llvm-9).
+     * optionsParser.getSourcePathList() returns 0, even with a command as simple as:
+     *     clang-standalone main.cpp
+     * The exact same command line works in clang-tidy, which has the same CommonOptionsParser code.
+     * Commented for now to figure if it's a compiler bug on my archlinux.
+     */
+    auto numOccurrencesFlag = cl::OneOrMore;
+#else
+    auto numOccurrencesFlag = cl::ZeroOrMore;
+#endif
+
+    CommonOptionsParser optionsParser(argc, argv, s_clazyCategory, numOccurrencesFlag);
+    llvm::errs() << optionsParser.getSourcePathList().size() << "\n";
 
     if (s_supportedChecks.getValue()) {
         std::cout << SUPPORTED_CHECKS_JSON_STR;