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<p class="MsoNormal">Hi, I have three questions about CMake’s use of a C Preprocessor for Fortran Source Files. I have scoured the CMake help documentation and googled extensively but have not found any solutions that worked for my specific situations.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1. What is the default C Preprocessor CMake uses for Fortran files?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have looked through the CMakeCache.txt generated from the top level build directory for the location of the C Preprocessor. Normally I use a C Preprocessor located at /lib/cpp to preprocess Fortran files. I was wondering if CMake has
some built in preprocessor or will it search for a preprocessor, in a similar manner to finding gcc on the system if its location is unspecified. These Fortran files in question have no actual C/C++ code in them, just preprocessor and #include statements,
so I only specify “Fortran” in my project name. It must be using some C preprocessor though because my Fortran files are being preprocessed mostly correctly.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">2. How do I retain C preprocessed Fortran source files while building?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I noticed that the easy solution to retaining C preprocessed C source files, as provided in two locations I googled, is to perform a “make foo.i” which is revealed with a “make help” in the build directory to provide potential targets.
When I perform a “make help,” the only source file specific targets provided are the .o targets. I have also noticed a specific CMake function prototype written in 2009 which would run a specified FPP executable (in my case /lib/gcc) and output preprocessed
files to be built, but it did not seem to succeed in my implementation (http://www.cmake.org/pipermail/cmake/2009-November/033359.html).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">3. How do I provide arguments to the C preprocessor?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Specifically, I need to give it the “-P –traditional” arguments when it preprocesses my Fortran files. Otherwise, comments with line numbers are retained in my source files which my compiler (ABSoft 95 11.1) will fail on. I could not
find anything in the CMake documentation on how to do this, and my best guess is that it would be a similar implementation as
<a href="http://www.cmake.org/pipermail/cmake/2010-July/038312.html">http://www.cmake.org/pipermail/cmake/2010-July/038312.html</a>, which I did successfully implement to provide flags for my RANLIB and AR library builders. I have also tried a add_custom_command
similar to <a href="http://www.cmake.org/pipermail/cmake/2009-June/029909.html">
http://www.cmake.org/pipermail/cmake/2009-June/029909.html</a> but with /lib/cpp instead of m4.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If it matters, these source files will always be built on Linux, so that allows for some flexibility in solutions.<o:p></o:p></p>
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