https://bugs.llvm.org/show_bug.cgi?id=47012
Bug ID: 47012
Summary: __cpp_threadsafe_static_init is not defined
Product: libc++
Version: 9.0
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: noloa...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
It appears Clang does not define __cpp_threadsafe_static_init like it should.
__cpp_threadsafe_static_init signals dynamic initialization and destruction
with concurrency (N2660).
I'm working on OS X 10.12 using Apple's Command Line Tools. Apple's CLT
provides Clang 9:
$ clang++ --version
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
The test program:
$ cat TestPrograms/test_cxx11_dyninit.cxx
int main(int argc, char* argv[])
{
#if __cpp_threadsafe_static_init >= 200806L
int x[1];
#else
int x[-1];
#endif
return 0;
}
$ clang++ -std=c++11 TestPrograms/test_cxx11_dyninit.cxx -o a.out
TestPrograms/test_cxx11_dyninit.cxx:7:11: error: 'x' declared as an array with
a
negative size
int x[-1];
^~
1 error generated.
Adding '-stdlib=libc++' does not help.
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