Am 04/04/2017 um 11:17 schrieb Magnus Therning:
Robert Schwarzelt <rschwarz...@gmail.com> writes:
Hi all,
I need to implement a code export function, that will only export code used
in a specific project configuration.
For this purpose I want to use unifdef (http://dotat.at/prog/unifdef/),
which is capable of removing unused #ifdef blocks.
The project uses static libraries like in following example:
add_library(
foo STATIC
foo.c
)
add_library(
bar STATIC
bar.c
)
target_compile_definitions(bar INTERFACE HAVE_BAR)
target_link_libraries(foo LINK_PUBLIC bar)
Now foo.c will be compiled with -DHAVE_BAR at build time.
To create a custom target using unifdef i need this information at cmake
configure time. I expected to find this in the property COMPILE_DEFINITIONS
of either the source file foo.c or target foo, but both are empty.
Does anyone know, how to get a list of definitions (that will be used at
build time) for targets or files?
Not to discourage you, but *every time* I've asked a question along the
lines of "how can I get a list of foo for a source file / target at
cmake configuration time" the answer has been "oh, that's not easy", or
even "oh, that's not possible". In every case I've resorted to trying to
find a way to push what I want to do until build time.
If you *can* find a way to do it post-configuration time I believe you will have
access to everything you need if you set "CMAKE_EXPORT_COMPILE_COMMANDS"
and then look at the resulting `compile_commands.json`.
/M
--
Magnus Therning OpenPGP: 0x927912051716CE39
email: mag...@therning.org jabber: mag...@therning.org
twitter: magthe http://therning.org/magnus
Finagle's Second Law:
Always keep a record of data — it indicates you've been working.
I successfully used the following commands to get the
INTERFACE_COMPILE_DEFINITIONS and the COMPILE_DEFINITIONS of a target
(yes, both of them may exist). And because the OP has specified
INTERFACE_COMPILE_DEFINITIONS he should evaluate that property of the
target.
get_target_property(_if_compile_defs YourTargetNameHere
INTERFACE_COMPILE_DEFINITIONS)
get_target_property(_compile_defs YourTargetNameHere COMPILE_DEFINITIONS)
Cheers Volker
--
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