[analyzer] Turn suppress-c++-stdlib on by default

We have several reports of false positives coming from libc++. For example,
there are reports of false positives in std::regex, std::wcout, and also
a bunch of issues are reported in https://reviews.llvm.org/D30593. In many
cases, the analyzer trips over the complex libc++ code invariants. Let's turn
off the reports coming from these headers until we can re-evalate the support.

We can turn this back on once we individually suppress all known false
positives and perform deeper evaluation on large codebases that use libc++.
We'd also need to commit to doing these evaluations regularly as libc++
headers change.

Differential Revision: https://reviews.llvm.org/D30798

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@297429 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/StaticAnalyzer/Core/AnalyzerOptions.cpp b/lib/StaticAnalyzer/Core/AnalyzerOptions.cpp
index 15422633ba33c20b7c2a1dd41019b374c47d5134..45ef612ee1d58fe9bb7c6a4b1061670667999626 100644 (file)
--- a/lib/StaticAnalyzer/Core/AnalyzerOptions.cpp
+++ b/lib/StaticAnalyzer/Core/AnalyzerOptions.cpp
@@ -230,7 +230,7 @@ bool AnalyzerOptions::shouldSuppressInlinedDefensiveChecks() {
 bool AnalyzerOptions::shouldSuppressFromCXXStandardLibrary() {
   return getBooleanOption(SuppressFromCXXStandardLibrary,
                           "suppress-c++-stdlib",
-                          /* Default = */ false);
+                          /* Default = */ true);
 }
 
 bool AnalyzerOptions::shouldReportIssuesInMainSourceFile() {

diff --git a/test/Analysis/diagnostics/explicit-suppression.cpp b/test/Analysis/diagnostics/explicit-suppression.cpp
index 69dffd7ab6c9725d72dd1998477335b3a513782f..193846c082bcc99d3a345d3fc3f6915aae1610cd 100644 (file)
--- a/test/Analysis/diagnostics/explicit-suppression.cpp
+++ b/test/Analysis/diagnostics/explicit-suppression.cpp
@@ -1,5 +1,6 @@
 // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -analyzer-config suppress-c++-stdlib=false -verify %s
 // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -analyzer-config suppress-c++-stdlib=true -DSUPPRESSED=1 -verify %s
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -DSUPPRESSED=1 -verify %s
 
 #ifdef SUPPRESSED
 // expected-no-diagnostics