[CMake] Selectively adding source files and compiling assembly sources

[Petr Kmoch]

Hi Johannes,

the only solution I can think of is something like:

#
option(WITH_A ...)
option(WITH_B ...)

set(MySources always/present/files ...)

if(WITH_A)
  list(APPEND MySources files/for/a ...)
endif()

if(WITH_B)
  list(APPEND MySources files/for/b ...)
endif()

add_executable(MyExec ${MySources})
#

I have never used assembler files, so I can't comment there, and I
don't think there's an option for better GUI grouping than string
prefixes.

Petr

On Sun, May 27, 2012 at 12:35 PM, Johannes Bauer <dfnsonfsduifb at gmx.de> wrote:
> Hi list,
>
> I'm a total beginner to CMake as a developer (although I've used it in
> the past for other projects before). Now I'm starting by converting a
> rather large Automake-Project to CMake. I'm doing it from scratch.
>
> In the project, executables and a shared library are created from the
> same objects. Which objects are chosen, however, depends on the
> configuration. For example consider the following sources:
>
> featurea/obj1.c
> featurea/obj2.c
> featurea/obj3.c
> featureb/obj1.c
> featureb/obj2.c
> featureb/obj3.c
> common.c
>
> let's say I want to create a executable only from common.c, but it
> should also compile and link featurea/*.c if the option WITH_A is set
> and should also compile and link featureb/*.c if the option WITH_B is
> set. These I've specified in the CMakeLists file:
>
> option(WITH_A "Enable FOO support" ON)
> option(WITH_B "Enable BAR component" OFF)
>
> However, I see no way of adding features to the "add_executable" option
> after it has been specified (something like add_source or the likes).
> How can this be done?
>
> Another problem I've run into is that the project has some assembly
> files ("*.s"), which even though I specify them in the add_executables
> command are just ignored (leading to unresolved symbols, of course, at
> link time). Any pointers for this?
>
> And is it maybe possible (not dramatic if it isn't) to group options
> into subgroups so they're easier to configure using cmake-gui? There is
> a "Grouped" checkbox, but it only uses the string representation (i.e.
> FOO_BAR is group FOO, subitem BAR) and allows only one level of nesting.
> Something like configuration of the linux kernel (with multiple levels
> of configuration) maybe?
>
> Best regards,
> Joe
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