Hi,
thanks for the hint, but my problem is exactly the opposite of the one
configure_file is solving. I'm already using configure_file in multiple
places, but here I don't want to write config files, instead I want to
parse their content back to cmake, and that's why I don't think
configure_file.
Regards
Clemens
Pau Garcia i Quiles wrote:
Hello,
Take a look at CONFIGURE_FILE
On Fri, Feb 13, 2009 at 12:46 PM, Clemens Arth <clemens.a...@gmx.at> wrote:
Hi,
I've got a question concerning string processing in cmake. Our software
framework consists of multiple libraries and has many different features to
be enabled or disabled using #defines. For example, one option is to compile
with OpenGL or with OpenGL ES support. Thus in a config.h file, one of two
variables is valid to be #defined, USE_OPENGL or USE_OPENGLES. Depending on
the variable defined cmake should link against a specific set of libraries.
Currently determining which feature is set works the following way in my
CMakeLists.txt:
Code:
# check for the configuration and set the corresponding GL/GLES libraries
accordingly
FILE(READ ${LIB_SOURCE_DIR}/include/config.h CURRENT_CONFIG)
STRING(REGEX MATCH "\#define USE_OPENGLES" GLES_IS_SET ${CURRENT_CONFIG})
STRING(REGEX MATCH "\#define USE_OPENGL" GL_IS_SET ${CURRENT_CONFIG})
IF("#define USE_OPENGLES" STREQUAL "${GLES_IS_SET}")
MESSAGE("GLES config!")
ELSE("#define USE_OPENGLES" STREQUAL "${GLES_IS_SET}")
IF("#define USE_OPENGL" STREQUAL "${GL_IS_SET}")
MESSAGE("GL config!")
ELSE("#define USE_OPENGL" STREQUAL "${GL_IS_SET}")
MESSAGE("Error! USE_GL or USE_GLES must be defined!")
ENDIF("#define USE_OPENGL" STREQUAL "${GL_IS_SET}")
ENDIF("#define USE_OPENGLES" STREQUAL "${GLES_IS_SET}")
Note that this is really a bad hack. First, if GLES_IS_SET is set ,GL_IS_SET
is also set automatically. Second, if by accident the string does not
exactly match the content (an additional <space>, or there is a second
variable, for example called USE_OPENGL_EXTRAS), everything gets really
weird or fails at all. Finally, a problem is that cmake does not actually
notice if I changed the config.h file, so there should be an option to mark
the configuration as dirty if the config.h file is altered - this is a
problem which must not necessarily be solved, but maybe there is a simple
solution to this.
Can someone give me some tips how to improve my really ugly solution?
Thanks and best regards
Clemens
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