It's possible to separate cmake parameters into files so that you don't
have to edit the main file when moving it from freedv-dev to freedv,
etc. This also keeps your revision control history clean when you change
parameters. Given a list of parameter names for the argument, the macro
below loads files in the parameters/ directory and sets them to
variables called Param.<name> .
# Parameters are stored as .txt files in the parameters/ subdirectory.
# They use semicolon to separate arguments, because this is what cmake uses
# in its list type. Thus, parameters/version.txt looks like this:
#
# 0;1;2
#
# Those are easy to separate at each semicolon into the major, minor,
# and patch version.
#
# You can override parameters on the command line, using
# -DParam.name=value
#
macro(load_parameters)
foreach(name ${ARGN})
set(filename "${CMAKE_SOURCE_DIR}/parameters/${name}.txt")
if("${Param.${name}}" STREQUAL "" AND EXISTS ${filename})
file(STRINGS ${filename} string)
set("Param.${name}" ${string})
endif("${Param.${name}}" STREQUAL "" AND EXISTS ${filename})
endforeach(name)
unset(filename)
endmacro(load_parameters)
Here's how I use this to do version numbers.
parameters/version.txt contains
0;1;0
You can separate these for easy use in the cmake file:
# This loads three parameters, version, codename, and build-type
load_parameters(version codename build-type)
# This separates version into three parameters (perhaps I can use an
array instead of a list?)
list(GET Param.version 0 Version.major)
list(GET Param.version 1 Version.minor)
list(GET Param.version 2 Version.patch)
unset(list)
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