Include directories
Most C
/C++
projects have headers in different directories than
sources. Thus you need to specify include directories. Let's assume
that we are at some subdirectory and wish to add its include
subdirectory to some target's search path. To create a include
directory object we do this:
incdir = include_directories('include')
The incdir
variable now holds a reference to the include
subdir.
Now we pass that as an argument to a build target:
executable('someprog', 'someprog.c', include_directories : incdir)
Note that these two commands can be given in any subdirectories and it will still work. Meson will keep track of the locations and generate proper compiler flags to make it all work.
Another thing to note is that include_directories
adds both the
source directory and corresponding build directory to include path, so
you don't have to care. If it turns out you don't want it after all, this can
be disabled with the implicit_include_directories
argument to the build
function you use.
The results of the search are