[cmake-developers] [CMake 0015913]: CMAKE_SYSTEM_NAME is not being set on cmake 3.3.2 Cygwin

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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https://public.kitware.com/Bug/view.php?id=15913 
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Reported By:                Gregory M. Baumgardner
Assigned To:                
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Project:                    CMake
Issue ID:                   15913
Category:                   CMake
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2016-01-12 16:29 EST
Last Modified:              2016-01-12 16:29 EST
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Summary:                    CMAKE_SYSTEM_NAME is not being set on cmake 3.3.2
Cygwin
Description: 
I installed cmake 3.3.2 directly from the Cygwin distribution, but for some
reason I cannot get the if(CYGWIN) to work properly.  It is probably related to
the fact that the the CMAKE_SYSTEM_NAME is not being set.  I have confirmed this
with a quick test, but have no idea what is wrong or why I cannot detect Cygwin.
 The --system-information shows that the CMAKE_SYSTEM_NAME=CYGWIN, but it is not
being set the same when I run cmake against my CMakeLists.txt file.   It would
be nice to have this feature worked as advertised.  

Steps to Reproduce: 
Run "cmake ." using supplied CMakeLists.txt file.  Output is:

-- Hello World
-- Cygwin is  and CMAKE_COMPILER_IS_CYGWIN =  and CMAKE_SYSTEM_NAME =

I expected that it should read:

-- Hello World
-- Cygwin is 1 and CMAKE_COMPILER_IS_CYGWIN = 1 and CMAKE_SYSTEM_NAME = CYGWIN


Additional Information: 
Avoid ctest truncation of output: CTEST_FULL_OUTPUT
========================================================
=== MAIN VARIABLES
========================================================
CMAKE_STATIC_LIBRARY_PREFIX == "lib"
CMAKE_STATIC_LIBRARY_SUFFIX == ".a"
CMAKE_SHARED_LIBRARY_PREFIX == "cyg"
CMAKE_SHARED_LIBRARY_SUFFIX == ".dll"
CMAKE_SHARED_MODULE_PREFIX == "cyg"
CMAKE_SHARED_MODULE_SUFFIX == ".dll"


CMAKE_DL_LIBS == "dl"
CMAKE_LIBRARY_PATH_FLAG == "-L"
CMAKE_LINK_LIBRARY_FLAG == "-l"
CMAKE_SKIP_RPATH == "NO"
CMAKE_SYSTEM_INFO_FILE == "Platform/CYGWIN"
CMAKE_SYSTEM_NAME == "CYGWIN"
CMAKE_SYSTEM == "CYGWIN-2.3.1(0.291/5/3)"
CMAKE_CXX_COMPILER == "/usr/bin/c++.exe"
CMAKE_C_COMPILER == "/usr/bin/cc"
CMAKE_COMPILER_IS_GNUCC == "1"
CMAKE_COMPILER_IS_GNUCXX == "1"

....
CMAKE_COMPILER_IS_CYGWIN "1"
CYGWIN "1"


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Issue History 
Date Modified    Username       Field                    Change               
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2016-01-12 16:29 Gregory M. BaumgardnerNew Issue                                
   
2016-01-12 16:29 Gregory M. BaumgardnerFile Added: CMakeLists.txt               
    
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