On 2015-05-13 07:41-0000 Arjen Markus wrote:
> Well, that was easy and it brought up the warning immediately:
>
>
>
> -- Explicitly setting policy CMP0051 to OLD
>
> -- Explicitly setting policy CMP0052 to OLD
>
> -- Explicitly setting policy CMP0053 to OLD
>
> -- Explicitly setting policy CMP0054 to OLD
>
> CMake Warning at /usr/share/cmake-3.1.2/Modules/Platform/CYGWIN.cmake:15
> (message):
>
> CMake no longer defines WIN32 on Cygwin!
>
>
>
> (1) If you are just trying to build this project, ignore this warning or
>
> quiet it by setting CMAKE_LEGACY_CYGWIN_WIN32=0 in your environment or in
>
> the CMake cache. If later configuration or build errors occur then this
>
> project may have been written under the assumption that Cygwin is WIN32.
>
> In that case, set CMAKE_LEGACY_CYGWIN_WIN32=1 instead.
>
>
>
> (2) If you are developing this project, add the line
>
>
>
> set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
>
>
>
> at the top of your top-level CMakeLists.txt file or set the minimum
>
> required version of CMake to 2.8.4 or higher. Then teach your project to
>
> build on Cygwin without WIN32.
>
> Call Stack (most recent call first):
>
> /usr/share/cmake-3.1.2/Modules/CMakeSystemSpecificInformation.cmake:36
> (include)
>
> CMakeLists.txt:39 (project)
That is tremendous progress to get it down to a fairly simple example
without having to do an entire PLplot build to see the issue.
But please
keep debugging the reason why the first simple project did
not emit the spurious warning and the second simple project did. For example,
from the
above the message occurred in the project command so you can remove
the next few lines, i.e.,
if(NOT (CYGWIN OR CMAKE_SYSTEM_NAME STREQUAL "Linux") )
# Latest CMake version as of 2015-05 for all platforms
# other than Cygwin or Linux.
plplot_cmake_minimum_required(VERSION 3.2.2 FATAL_ERROR)
endif(NOT (CYGWIN OR CMAKE_SYSTEM_NAME STREQUAL "Linux") )
to make the second project more similar to the first (presumably without
affecting the spurious warning).
Also, you can dispense completely with the function and
replace
plplot_cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)
with
cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)
if(POLICY CMP0051)
message(STATUS "Explicitly setting policy CMP0051 to OLD")
cmake_policy(SET CMP0051 OLD)
endif(POLICY CMP0051)
to mimic what goes on in the function.
Note, those two changes should make the third simple example identical
with the first except for the if(POLICY CMP0051) stanza
above.
So if that third version emits the spurious error message, then that
narrows down the cause to the if, message, or cmake_policy commands,
but if the 3rd simple example does not emit the message, then
please simplify the second version as follows to see whether that
generates the message
function(plplot_cmake_minimum_required)
cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)
if(POLICY CMP0051)
message(STATUS "Explicitly setting policy CMP0051 to OLD")
cmake_policy(SET CMP0051 OLD)
endif(POLICY CMP0051)
endfunction(plplot_cmake_minimum_required)
plplot_cmake_minimum_required()
project(plplot NONE)
enable_language(C)
message(STATUS "CMake version = ${CMAKE_VERSION}")
message(STATUS "CMAKE_SYSTEM_NAME = ${CMAKE_SYSTEM_NAME}")
which should be identical to the 3rd version other than
using the plplot_cmake_minimum_required function wrapper.
Remember, the goal here is to come up with the simplest possible
example that emits the spurious message that I can take to the cmake
developers. So I have come up with several variations between the
current first simple example and current second simple example, but
please use your imagination as well to add as little as possible to
the first simple example to get it to emit the spurious message.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
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