https://bugs.llvm.org/show_bug.cgi?id=45405
Bug ID: 45405
Summary: __sigsetjmp declared twice only with libstdc++
Product: clang
Version: 9.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
The actual third-party library I was using that caused the bug was more
complicated, but this is a minimal program that will replicate the issue:
#include <string>
namespace {
#include <setjmp.h>
}
int main(int argc, char* argv[]) {
return 0;
}
As you can see below, this program fails to compile when using clang and the
default libstdc++. If you specify libc++ it will compile. g++ compiles fine
(with libstdc++, as that's all it uses), however.
---
$ clang++ --version
clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ clang++ test.cpp -stdlib=libstdc++
In file included from test.cpp:3:
/usr/include/setjmp.h:54:12: error: conflicting types for '__sigsetjmp'
extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask)
__THROWNL;
^
/usr/include/pthread.h:744:12: note: previous declaration is here
extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __THROWNL;
^
1 error generated.
$ clang++ test.cpp -stdlib=libc++
$ g++ --version
g++ (Ubuntu 8.3.0-26ubuntu1~18.04) 8.3.0
$ g++ test.cpp
---
Note: I ran this on WSL (Ubuntu 18.04) on Windows 10.
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