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Date: Fri, 18 Jul 2025 18:14:34 -0400
Message-ID: <CAGB_HuS1AEp3WGF5AANhtZyWnr+QdfbJZ3_egaaE1hM8QO6rig@mail.gmail.com>
Subject: CMake is not finding a usable cc on my cygwin system,
 I've tried many things.
To: cygwin AT cygwin DOT com
From: Soren via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Soren <somian08 AT gmail DOT com>
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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/
cmake -G"Unix Makefiles" C:/Users/somia/Downloads/libjpeg-turbo-3.1.1/
-- The C compiler identification is GNU 12.5.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: /c/ix/cygwin/bin/cc
-- Check for working C compiler: /c/ix/cygwin/bin/cc - broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/c/ix/cygwin/bin/cc"

  is not able to compile a simple test program.
 It fails with the following output:
 Change Dir: '/c/Users/somia/build/libjpeg-turbo/CMakeFiles/CMakeScratch/TryCompile-PYyzjN'

    Run Build Command(s): /usr/bin/cmake.exe -E env VERBOSE=1
/c/perl/c/bin/gmake.exe -f Makefile cmTC_de473/fast
    C:/perl/c/bin/gmake  -f CMakeFiles/cmTC_de473.dir/build.make
CMakeFiles/cmTC_de473.dir/build
    gmake[1]: Entering directory
'C:/Users/somia/build/libjpeg-turbo/CMakeFiles/CMakeScratch/TryCompile-PYyzjN'
    Building C object CMakeFiles/cmTC_de473.dir/testCCompiler.c.o
    /c/ix/cygwin/bin/cc    -o
CMakeFiles/cmTC_de473.dir/testCCompiler.c.o -c
/c/Users/somia/build/libjpeg-turbo/CMakeFiles/CMakeScratch/TryCompile-PYyzjN/testCCompiler.c
    /usr/bin/sh: /c/ix/cygwin/bin/cc: No such file or directory
    gmake[1]: *** [CMakeFiles/cmTC_de473.dir/build.make:78:
CMakeFiles/cmTC_de473.dir/testCCompiler.c.o] Error 127
    gmake[1]: Leaving directory
'C:/Users/somia/build/libjpeg-turbo/CMakeFiles/CMakeScratch/TryCompile-PYyzjN'
    gmake: *** [Makefile:127: cmTC_de473/fast] Error 2


  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:16 (project)

-- Configuring incomplete, errors occurred!

If I clean out all cached data in my build dir and set `CC=/bin/gcc';
export CC' is get another error:

cmake -G"Unix Makefiles" C:/Users/somia/Downloads/libjpeg-turbo-3.1.1/
CMake Error at /usr/share/cmake/Modules/CMakeDetermineCCompiler.cmake:49
(message):
  Could not find compiler set in environment variable CC:
  /bin/gcc.
Call Stack (most recent call first):
  CMakeLists.txt:16 (project)

CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!

  I hear people saying good things about CMake but this is maddening.
My cmake is newly installed in /usr/bin/cmake and is version 3.30.1

I'm trying to build libjpeg-turbo as my pathnames above would suggest.

  -- Soren

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