[CMake] Separate compile flags for ASM/C compilers and lists

[Andreas Pakulat]

Hi,

On Mon, Sep 16, 2013 at 10:24 AM, Nikolay <lorddoskias at gmail.com> wrote:

>
> On 14 September 2013 09:59, Alexander Neundorf <a.neundorf-work at gmx.net>wrote:
>
>> On Friday 13 September 2013, lorddoskias wrote:
>> > Hello list,
>> >
>> > I have a couple of questions whose answers I couldn't find. So first
>> > thing's first - I have the following function which I intend to use to
>> > add a number of library targets:
>> >
>> > function(build_mps_m3_lib LIBRARY_NAME C_SOURCE ASM_SOURCE CPU_TYPE)
>> >      set_property(SOURCE ${${C_SOURCE}} PROPERTY COMPILE_FLAGS "-g
>> > --cpu=${CPU_TYPE} -O0")
>> >      set_property(SOURCE ${${ASM_SOURCE}} PROPERTY COMPILE_FLAGS "-g
>> > --cpu=${CPU_TYPE} --apcs=interwork")
>> >      add_library(${LIBRARY_NAME}  ${${SOURCE}} ${${ASM_SOURCE}})
>> >      set(TARGET_DIR "mps-m3")
>> >      set(ASM_COMPILE_FLAGS "-g --cpu=${CPU_TYPE} --apcs=interwork")
>> >      #custom armasm command line
>> >      set(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER>
>> > ${ASM_COMPILE_FLAGS} <SOURCE> -o <OBJECT>")
>> >      #set_target_properties(${LIBRARY_NAME} PROPERTIES C_COMPILE_FLAGS
>> > "-g --cpu=${CPU_TYPE} -O0")
>> > endfunction(build_mps_m3_lib)
>> >
>> >
>> > What I want to achieve is to have clear separation between the ASM
>> > compiler flags and the C compiler flags. Since I'm not using the GNU
>> > (ergo GCC) toolchain I cannot simply set the properties on the resulting
>> > library target to set the COMPILE_FLAGS. Essentially what I want to
>> > achieve is being able to set arbitrary compile options for the C and ASM
>> > compiler WITHOUT both of those interfering.
>>
>> In general they don't interfer.
>> What compiler and assembler are you using ?
>> Maybe you need a new "assembler dialect". Those are quite simply to do,
>> you
>> can have a look e.g. at the files containing "MASM" in their name in
>> Modules/.
>>
>
> Unfortunately I do not find the statement "In generla they don't interfere
> to be correct". Here is what I'm talking about:
>
> The default definitions of ASM_COMPILE_OBJECT is : ASM_COMPILE_OBJECTP:
> <CMAKE_ASM_COMPILER> <DEFINES> <FLAGS> -o <OBJECT> -c <SOURCE>
>
> meaning it will include all defines/flags set by
> add_definition/set_target_properties for COMPILE_DEFINITIONS or
> COMPILER_FLAGS. Unfortunately if I have something like the following:
> add_library(tx-mps-m4 ${KERNEL_SOURCE})
> set_target_properties(tx-mps-m4 PROPERTIES COMPILE_FLAGS "-g
> --cpu=cortex-m4 -O0")
>
> I get the exact same flags (-g --cpu and -O0) passed to the assmebler
> (armasm) in my case. And the assembler doesn't understand the -O0 and it
> exists. How can I avoid this situation?
>

Don't set those properties on the target. Instead use
set_source_file_properties to set those flags that differ between different
types of source files. CMake supports setting compile definitions as well
as flags for each source file individually.

Andreas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.cmake.org/pipermail/cmake/attachments/20130916/fc364ec2/attachment.htm>