Opened 6 years ago
Last modified 6 years ago
#57578 closed defect
__has_feature(cxx_exceptions) returns true but fails to compile std::uncaught_exceptions() — at Version 3
Reported by: | noloader (Jeffrey Walton) | Owned by: | |
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Priority: | Normal | Milestone: | |
Component: | ports | Version: | |
Keywords: | Cc: | ||
Port: | clang-6.0 |
Description (last modified by noloader (Jeffrey Walton))
I'm testing C++17 on OS X 10.8.5 and 10.9.5 using Macports Clang compiler versions 5.0 and 6.0. Attempting to compile the following program:
$ cat test.cxx #if __EXCEPTIONS && __has_feature(cxx_exceptions) # include <exception> # define CXX17_EXCEPTIONS 1 #endif void Foo() { #if defined(CXX17_EXCEPTIONS) if (std::uncaught_exceptions() == 0) #endif { int x = 0; } }
Results in:
$ /opt/local/bin/clang++-mp-5.0 -std=gnu++17 test.cxx -c test.cxx:9:14: error: 'uncaught_exceptions' is unavailable: introduced in macOS 10.12 if (std::uncaught_exceptions() == 0) ^ /opt/local/libexec/llvm-5.0/include/c++/v1/exception:130:63: note: 'uncaught_exceptions' has been explicitly marked unavailable here _LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_e...
-std=c++17 produces the same error.
According to the LLVM 3.6 release notes (https://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro), I believe I am using the correct feature test:
To reliably test if C++ exceptions are enabled, use EXCEPTIONS && has_feature(cxx_exceptions), else things won’t work in all versions of Clang in Objective-C++ files.
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Upstream issue report at https://bugs.llvm.org/show_bug.cgi?id=39631
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$ /opt/local/bin/clang++-mp-6.0 --version clang version 6.0.1 (tags/RELEASE_601/final) Target: x86_64-apple-darwin13.4.0 Thread model: posix InstalledDir: /opt/local/libexec/llvm-6.0/bin $ /opt/local/bin/clang++-mp-5.0 --version clang version 5.0.2 (tags/RELEASE_502/final) Target: x86_64-apple-darwin13.4.0 Thread model: posix InstalledDir: /opt/local/libexec/llvm-5.0/bin $ sw_vers ProductName: Mac OS X ProductVersion: 10.9.5 BuildVersion: 13F1911
I don't know the Macport version and I can't find the method searching ("macport version command line"). "port --version" and "port -V" does not return it.
Change History (3)
comment:1 Changed 6 years ago by noloader (Jeffrey Walton)
Description: | modified (diff) |
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comment:2 Changed 6 years ago by noloader (Jeffrey Walton)
Description: | modified (diff) |
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comment:3 Changed 6 years ago by noloader (Jeffrey Walton)
Description: | modified (diff) |
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