From: Filipe Cabecinhas <me@filcab.net>
Date: Sat, 18 Jul 2015 06:35:24 +0000 (+0000)
Subject: Silence the driver warnings, if we see "-w" on the Driver.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9fdf093bc9a22a498bbb7ed95ff8099ed6350e00;p=clang

Silence the driver warnings, if we see "-w" on the Driver.

Summary:
We can enable warnings after that -w, so the patch might not be 100%
correct.

The problem that triggered this is: we have some amount of tests that
expect 0 warnings (including unit tests for -w), but -w ends up not fully
silencing everything.

Reviewers: echristo, chandlerc

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D11322

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@242606 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index d7a5ee9139..455e492d83 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -387,6 +387,9 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
 
   InputArgList Args = ParseArgStrings(ArgList.slice(1));
 
+  // Silence driver warnings if requested
+  Diags.setIgnoreAllWarnings(Args.hasArg(options::OPT_w));
+
   // -no-canonical-prefixes is used very early in main.
   Args.ClaimAllArgs(options::OPT_no_canonical_prefixes);
 
diff --git a/test/Index/warning-flags.c b/test/Index/warning-flags.c
index b76662e9ee..955d68c754 100644
--- a/test/Index/warning-flags.c
+++ b/test/Index/warning-flags.c
@@ -7,6 +7,7 @@ int *bar(float *f) { return f; }
 // RUN: c-index-test -test-load-source-reparse 5 all -Wno-return-type %s 2>&1|FileCheck -check-prefix=CHECK-SECOND-WARNING %s
 // RUN: c-index-test -test-load-source all -w %s 2>&1|not grep warning:
 // RUN: c-index-test -test-load-source-reparse 5 all -w %s 2>&1|not grep warning:
+// RUN: c-index-test -test-load-source all -w -O4 %s 2>&1|not grep warning:
 
 // CHECK-BOTH-WARNINGS: warning: control reaches end of non-void function
 // CHECK-BOTH-WARNINGS: warning: incompatible pointer types returning 'float *' from a function with result type 'int *'