[CMake] Check header file woos

[Jakub Zakrzewski]

Is there any reason, why including just this header is not enough? Maybe some required definitions missing?
CMake checks includes by compiling a simple program that does nothing. If compilation fails, the header is assumed not to exist.  Those CMake flags can be helpful in diagnosing the issue:

  --debug-trycompile          = Do not delete the try_compile build tree.
                                Only useful on one try_compile at a time.
  --debug-output              = Put cmake in a debug mode.
  --trace                     = Put cmake in trace mode.


--
Gruesse,
Jakub


From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Oliver
Sent: Dienstag, 18. Februar 2014 22:11
To: cmake at cmake.org
Subject: [CMake] Check header file woos

All,

I am trying to use CheckIncludeFiles for header file check. I know the file I want to check is located at /usr/include/lustre, so I supplied the following:

include(CheckIncludeFiles)
check_include_files("lustre/lustre_user.h" HAVE_LUSTRE_USER_H)
And it report can't find. Then I tried to be explicit about it
set(CMAKE_REQUIRED_INCLUDES /usr/include/lustre)

Still no avail. If I check any other header file in that directory, say "sys/io.h", it will work as expected. I am puzzled ... anything I missed?

Thanks


--
Oliver
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