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Date:	Fri, 18 Jul 2025 20:08:07 -0400
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Subject:	Re: CMake is not finding a usable cc on my cygwin system, I've tried
	many things.
X-ASG-Orig-Subj:	Re: CMake is not finding a usable cc on my cygwin system,
	I've tried many things.
To:	Soren <somian08 AT gmail DOT com>, cygwin AT cygwin DOT com
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From:	Eliot Moss via Cygwin <cygwin AT cygwin DOT com>
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On 7/18/2025 6:14 PM, Soren via Cygwin wrote:
> Hello Cygwinstas,
> 
> Cygwin root is C:\ix\cygwin, just so you know.
> 
> This is the output I see: mintty screen dump:
> 
> $ cmake -G"Unix Makefiles" C:/Users/somia/Downloads/libjpeg-turbo-3.1.1/

Caveat: I'm no expert on cmake, just a long time cygwin user.

I'm assuming we're talking about _Cygwin_ cmake, not some Windows tool.
If it's a Windows tool, I'd check the Windows path, and of course you
should be getting at a Windows C compiler for cc.

So, if cmake is a cygwin version, things I would check:

1) Is (cygwin) /c linked to /cygdrive/c?  That would be so that /c/...
    is meaningful.

2) Is your compiler called cc, or something else, like gcc?  Using the
    CC environment variable, as you later did, seems a good idea, but is
    the C compiler actually where you said, i.e., /bin?  I think /usr/bin
    might be more conventional, but they may be the same directory.

3) I would write:
    cmake -G"Unix Makefiles" /c/Users/somia/Downloads/libjpeg-turbo-3.1.1/
    That is, use a _cygwin_ style path, not a Windows style one when invoking
    a cygwin tool.  Using a Windows path _might_ work.  (Personally, I would
    not build in the Downloads area, but that's more personal taste I suppose.)

4) Maybe you want to set CMAKE_C_COMPILER ?

Regards - Eliot Moss


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