[CMake] Problem with circular includes

[Marc-André Laverdière]

Dear CMakers,

I'm working on an extension to the standard C library and I'm porting to 
home-brew makefiles to CMake. Not making much progress so far.

It looks like one hurdle is that we use stuff like #include "stdio.h", 
which contains some extra definitions and then an include to the real 
<stdio.h>.

Here is the interesting part of the CMakeLists.txt file I use:
SUBDIRS(adapters stdio stdlib string test time wchar)

INCLUDE_DIRECTORIES(BEFORE . include stdio stdlib string test time wchar)

#add definitions, compiler switches, etc.
ADD_DEFINITIONS(-I- -pipe -Wall -W -O3 -std=c99 -posix 
-D__STDC_WANT_LIB_EXT1__ 1)

Now, if I have the -I-, the compiler whines that it can't find the file 
(especially that the newer version doesn't like -I-). I narrowed it down 
to the #include "stdio.h".
Now, if I remove the -I-, I get a truckload of errors. My best guess is 
that its trying to circularly find its include files withing mine.
The makefiles I manually coded in the past digested -I- very well, so 
this is an unenjoyed obstacle.

My guess is that I could rename our .h files and hope that there are not 
too many references to fix, but that's not a very tempting option.

How can I resolve this situation using CMake? Will it be really portable?
Is there an argument we can add in INCLUDE_DIRECTORIES to deal with the 
situation cleanly (say, INCLUDE_DIRECTORIES(QUOTES ...) )?

With kind regards,

-- 
Marc-André LAVERDIÈRE, B. Eng., M. A. Sc. (in progress)
Research Assitant - Computer Security Laboratory
CIISE, Université Concordia University, Montréal, Québec, Canada
www.ciise.concordia.ca

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