[CMake] add_dependencies being ignored for add_custom_command?

[Martin Braun]

Hey,

I'm at a loss here:

I have a command that's run with add_custom_command(). I need to run it
before compiling a library that I add with add_library(), because it
generates some header files.

This was my first try:

file1:
{{{
add_custom_command(
    OUTPUT foo.hpp
    COMMAND bar
)
}}}

file2:
{{{
add_library(baz ${sources})
add_dependencies(baz ${CMAKE_BINARY_DIR}/path/to/foo.hpp)
}}}

==> This didn't work. If I run make -j4, it will always try and compile
my ${sources} before it ran the command. Maybe I'm specifying targets
the wrong way?

Next try:

file1:
{{{
add_custom_command(TARGET baz
    PRE_BUILD
    OUTPUT foo.hpp
    COMMAND bar
)
}}}

file2:
{{{
add_library(baz ${sources})
}}}


==> Same behaviour.

I'm using CMake 2.8.2.12. Really, I need something that works with CMake
2.8.0 because that's the minimum we guarantee our customers.

Any ideas? Thanks in advance!

Cheers,
Martin