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

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

[ggl329]

In my environment, clang doesn't work as reported in
https://cygwin.com/pipermail/cygwin/2022-December/252719.html .

I found that it doesn't work with cygwin-3.4.0-1,
but works with cygwin-3.3.6-1.
cygwin-3.5.0-0.69.g8a003605c1df doesn't help.
Changes in cygwin-3.4.0-1 bring this issue?
or clang needs to be rebuilt?

clang                                   8.0.1-1
compiler-rt                             8.0.1-1
libclang-devel                          8.0.1-1
libclang8                               8.0.1-1
libllvm-devel                           8.0.1-1
libllvm8                                8.0.1-1
libpolly-devel                          8.0.1-1
libpolly8                               8.0.1-1
llvm                                    8.0.1-1

# Sorry for creating a new thread.
# I didn't receive the original report, maybe due to
# https://cygwin.com/pipermail/cygwin/2022-December/252726.html .

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

[Csaba Raduly]

On Sun, 8 Jan 2023 at 09:11, ggl329 via Cygwin <cygwin@cygwin.com> wrote:
>
> In my environment, clang doesn't work as reported in
> https://cygwin.com/pipermail/cygwin/2022-December/252719.html .
>
> I found that it doesn't work with cygwin-3.4.0-1,
> but works with cygwin-3.3.6-1.
> cygwin-3.5.0-0.69.g8a003605c1df doesn't help.
> Changes in cygwin-3.4.0-1 bring this issue?
> or clang needs to be rebuilt?
>
> clang                                   8.0.1-1
[snip]

This was working before I upgraded Cygwin:

$ clang --version
clang version 8.0.1 (tags/RELEASE_801/final)
Target: x86_64-unknown-windows-cygnus
Thread model: posix
InstalledDir: /usr/bin

$ clang-format.exe --version
clang-format version 8.0.1 (tags/RELEASE_801/final)

$ uname -a
CYGWIN_NT-10.0-19045 AMDAHL 3.3.5-341.x86_64 2022-05-13 12:27 UTC x86_64 Cygwin

But it doesn't work anymore with

$ uname -a
CYGWIN_NT-10.0-19045 AMDAHL 3.4.3-1.x86_64 2022-12-16 12:38 UTC x86_64 Cygwin

(same symptom as https://cygwin.com/pipermail/cygwin/2022-December/252719.html)

Additionally,

$ strace /usr/bin/clang --version
strace.exe: error creating process C:\cygwin64\bin\clang, (error 5)

$ gdb -q /usr/bin/clang -ex run
Reading symbols from /usr/bin/clang...
(No debugging symbols found in /usr/bin/clang)
Starting program: /usr/bin/clang
[New Thread 804.0x2d50]
[New Thread 804.0xe6c]
[New Thread 804.0x200c]
[Thread 804.0xe6c exited with code 3221225785]
[Thread 804.0x10b8 exited with code 3221225785]
[Thread 804.0x2d50 exited with code 3221225785]
During startup program exited with code 0xc0000139.

0xC0000139 is "Entry point not found"

Csaba
-- 
You can get very substantial performance improvements
by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler
So if you're looking for a completely portable, 100% standards-conformant way
to get the wrong information: this is what you want. - Scott Meyers (C++TDaWYK)

Re: 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.

Re: 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 13:31, Csaba Raduly wrote:
> On Sun, 8 Jan 2023 at 12:02, Jon Turney  wrote:
> ...
>> shows the actual problem...
> ...
>> ... which does correspond to a change made in Cygwin 3.5.0.

Sorry, my mistake.  I meant to write 3.4.0 here.

> But my Cygwin is only 3.4.3:
> 
>      Cygwin DLL version info:
>          DLL version: 3.4.3
>          API major: 0
>          API minor: 344
>          Shared data: 5
>          DLL identifier: cygwin1
> 
> (and the original poster claimed to have 3.4.0-1)

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

[Corinna Vinschen]

On Jan  8 11:02, Jon Turney via Cygwin wrote:
> 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.
> ---------------------------

This should be fixed in cygwin-3.5.0-0.72.g7886327fbf92 and,
ultimately, a later 3.4.4 release.


Thanks,
Corinna

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

[ggl329]

On 2023/01/09 22:05, Corinna Vinschen via Cygwin wrote:
> On Jan  8 11:02, Jon Turney via Cygwin wrote:
>>
>> $ 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.
>> ---------------------------
> 
> This should be fixed in cygwin-3.5.0-0.72.g7886327fbf92 and,
> ultimately, a later 3.4.4 release.

I confirmed that clang exits successfully
in cygwin-3.5.0-0.79.g3b7df69aaa57 environment.
Thanks.

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

[Corinna Vinschen]

On Jan 11 00:35, ggl329 via Cygwin wrote:
> On 2023/01/09 22:05, Corinna Vinschen via Cygwin wrote:
> > On Jan  8 11:02, Jon Turney via Cygwin wrote:
> > > 
> > > $ 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.
> > > ---------------------------
> > 
> > This should be fixed in cygwin-3.5.0-0.72.g7886327fbf92 and,
> > ultimately, a later 3.4.4 release.
> 
> I confirmed that clang exits successfully
> in cygwin-3.5.0-0.79.g3b7df69aaa57 environment.
> Thanks.

Thanks for testing!


Corinna