clang doesn't work from cygwin-3.4.0 (Re: clang-format and clang-check return 127 and no text)

[Jon Turney]

On 08/01/2023 09:18, Csaba Raduly via Cygwin wrote:
> On Sun, 8 Jan 2023 at 09:11, ggl329 via Cygwin <cygwin@cygwin.com> wrote:
> 
> $ strace /usr/bin/clang --version
> strace.exe: error creating process C:\cygwin64\bin\clang, (error 5)

This will usually avail you naught, as clang is a Cygwin symlink, and 
strace as a pure Windows program doesn't understand those (which is what 
that error is trying to tell you)

$ strace $(realpath $(which clang))

shows the actual problem...

---------------------------
clang-8.exe - Entry Point Not Found
---------------------------
The procedure entry point _alloca could not be located in the dynamic 
link library C:\cygwin64\bin\cygLLVMSupport-8.dll.
---------------------------

... which does correspond to a change made in Cygwin 3.5.0.