This looks like a driver bug; a complete reproducer needs a Darwin triple, in order to get exceptions enabled for Obj-C by default:
$ ./build/bin/clang -fno-exceptions -x objective-c++ -target x86_64-apple-darwin11 -v /dev/null [...]clang-3.6" -cc1 [...] -fexceptions [...] The issue is that -fno-exceptions has no effect in Objective-C (look at the exceptionSettings function in Driver/Tools.cpp and note that an explicit -fno-exceptions does *not* turn off ShouldUseExceptionTables; look at addExceptionArgs and note that it overrides that flag anyway if we're on Darwin). It seems pretty clear that passing -fno-exceptions to the driver should never result in a -cc1 invocation with -fexceptions enabled... On Thu, Dec 4, 2014 at 4:14 PM, Hans Wennborg <[email protected]> wrote: > On Mon, Oct 27, 2014 at 1:02 PM, David Majnemer > <[email protected]> wrote: > > Author: majnemer > > Date: Mon Oct 27 15:02:19 2014 > > New Revision: 220714 > > > This broke Chromium: > > http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_ng/builds/11730/steps/compile%20%28with%20patch%29/logs/stdio > > > --- cfe/trunk/test/Preprocessor/predefined-exceptions.m (original) > > +++ cfe/trunk/test/Preprocessor/predefined-exceptions.m Mon Oct 27 > 15:02:19 2014 > > @@ -1,6 +1,6 @@ > > // RUN: %clang_cc1 -x objective-c -fobjc-exceptions -fexceptions -E -dM > %s | FileCheck -check-prefix=CHECK-OBJC-NOCXX %s > > // CHECK-OBJC-NOCXX: #define OBJC_ZEROCOST_EXCEPTIONS 1 > > -// CHECK-OBJC-NOCXX-NOT: #define __EXCEPTIONS 1 > > +// CHECK-OBJC-NOCXX: #define __EXCEPTIONS 1 > > It seems this reverses the test, and does the opposite of what at > least the code I was trying to compile with -fno-exceptions expects: > > https://code.google.com/p/chromium/codesearch#chromium/src/breakpad/src/client/mac/Framework/Breakpad.mm&l=51 > _______________________________________________ > cfe-commits mailing list > [email protected] > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits >
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