Hello!
On my way for looking for simpler building of my C++ code and easy support
for windows and Mac OS X (bundles) (which seem to be lot of fun to build
with my current autoconf/automake aproach) I found CMake and decided to test
it.
I wrote a simple makefile for one of my binaries for windows and msys
environment.
However I have problems building my program that accesses a library that
supports a pkg-config file for easy linking.
I found some information about the available pkgconfig support.
Adding CFLAGS is simple by setting "CMAKE_CXX_FLAGS" (however this makes the
flags getting added also to the linking step, too, which seemto be wrong to
me). However setting equivalent "CMAKE_CXX_LINK_FLAGS" or using
SET_TARGET_PROPERTIES... LINK_FLAGS did not success because the order of
arguments in this case is wrong for linking. The objects of my binary are
places behind the library arguments (-L and -l) thus resulting in unresolved
symbols. The linker flags for the library have to get placed *after* the
program object files!
Using higher level cmake stuff is not easy (variables for search ddiretories
and libraries), because my linker flags include -L and -l options which have
to be splited first (and what if one directory contains a space?) and is
ugly because I have to add this code block to every of my programs.
Is there an easy way to place my library linker arguments after the program
objects files or has somebody code for splitting pkg-config result values
for the higher level cmake variables? Or can I write a pkg-config pc file
files while compiling my library to gets read by cmake directly (whichout
yet switching the build of my library to cmake)?
Another remark:
My pkg-config 0.15 and also the current version have aditional access
options which already split compiler flags and linker flags into directory
including parts and library linking and other parts. Which seems to be
exactly the information that has to be injected into cmake. Why were such
options not used?
--libs output all linker flags
--libs-only-l output -l flags
--libs-only-other output other libs (e.g.
-pthread)
--libs-only-L output -L flags
--cflags output all pre-processor and
compiler flags
--cflags-only-I output -I flags
--cflags-only-other output cflags not covered by
the cflags-only-I option
Property support for pkg-config IMHO is high priority because more and more
unix software makes use of it - and it is realy simple to use.
--
Gruß...
Tim.
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