ProductName:    Mac OS X
ProductVersion:    10.13.3
BuildVersion:    17D47
Xcode 9.2
Build version 9C40b

and gcc --version

Configured with: --prefix=/Applications/ --
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir: /Applications/

I get the output:

Darwin 17.4.0 Darwin Kernel Version 17.4.0: 
Sun Dec 17 09:19:54 PST 2017; root:xnu-4570.41.2~1/RELEASE_X86_64 x86_64
<forksigaltstack.c -o forksigaltstack && ./forksigaltstack
status = 4

On Friday, 23 February 2018 02:10:12 UTC+11, Jeroen Demeyer wrote:
> If you have an OS X (or BSD) system installed with development tools, 
> please run: 
> uname -a 
> gcc forksigaltstack.c -o forksigaltstack && ./forksigaltstack 
> and post the output. This code is a reduction of a test failure in 
> cysignals. I consider that failure to be an OS X bug. I want to have 
> some better idea of which systems are affected. 
> The expected output is 
> got signal 11 
> status = 0 
> but on some (presumably broken) systems I get 
> status = 4 

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