[PATCH] D26166: [Sema] Don't issue analysis-based warnings when a fatal error has occurred
Akira Hatanaka via cfe-commits
cfe-commits at lists.llvm.org
Mon Oct 31 14:34:57 PDT 2016
ahatanak created this revision.
ahatanak added reviewers: rsmith, majnemer.
ahatanak added a subscriber: cfe-commits.
This patch makes AnalysisBasedWarnings::IssueWarnings return without issuing warnings based on CFG analysis when a fatal error has occurred. This is needed to avoid a crash that occurs when compiling the test case (instantiate-template-fatal-error.cpp).
My first patch made changes in InstantiatingTemplate::InstantiatingTemplate to call hasUncompilableErrorOccurred instead of hasFatalErrorOccurred at SemaTemplateInstantiate.cpp:214. That fixed the crash for the test case but introduced a large number of regression test failures, so I fixed AnalysisBasedWarnings::IssueWarnings instead.
https://reviews.llvm.org/D26166
Files:
lib/Sema/AnalysisBasedWarnings.cpp
test/SemaCXX/instantiate-template-fatal-error.cpp
Index: test/SemaCXX/instantiate-template-fatal-error.cpp
===================================================================
--- /dev/null
+++ test/SemaCXX/instantiate-template-fatal-error.cpp
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 %s
+
+#pragma clang diagnostic fatal "-Wall"
+#pragma clang diagnostic fatal "-Wold-style-cast"
+
+template <class T> bool operator==(const long long *a, T* b) {
+ return a == (const long long*)b; // expected-error {{use of old-style cast}}
+}
+
+template<class T>
+struct S1 {
+};
+
+template<class T>
+struct S2 : S1<T> {
+ bool m1(const long long *a, T *b) const { return a == b; }
+};
+
+bool foo1(const long long *a, int *b) {
+ S2<int> s2;
+ return s2.m1(a, b);
+}
Index: lib/Sema/AnalysisBasedWarnings.cpp
===================================================================
--- lib/Sema/AnalysisBasedWarnings.cpp
+++ lib/Sema/AnalysisBasedWarnings.cpp
@@ -1914,7 +1914,7 @@
if (cast<DeclContext>(D)->isDependentContext())
return;
- if (Diags.hasUncompilableErrorOccurred()) {
+ if (Diags.hasUncompilableErrorOccurred() || Diags.hasFatalErrorOccurred()) {
// Flush out any possibly unreachable diagnostics.
flushDiagnostics(S, fscope);
return;
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