Alexander Neundorf wrote:
> On Monday 29 July 2013, Stephen Kelly wrote:
>> Alexander Neundorf wrote:
>> > So it can be used in tll() calls to link against the library (package).
>> > What makes it differ from Foo_LIBRARIES, is that CMake checks that each
>> > of the items listed in this variable
>> > * is an existing target
>> >
>> > * has the INTERFACE_INCLUDE_DIRS property set.
>>
>> Are you really certain it is always an error for a target to not set
>> this?
>
> I think so.
> If I want to use symbols from a library, I should include its headers, and
> for that the include dirs need to be known.
>
> For header-only libraries even more.
>
> Are there cases where this is not the case ?
There will/can be in the future.
add_library(picon INTERFACE)
set_property(TARGET picon INTERFACE_POSITION_INDEPENDENT_CODE ON)
add_library(picoff INTERFACE)
set_property(TARGET picoff INTERFACE_POSITION_INDEPENDENT_CODE ON)
...
# Use linking to psuedo targets to enable compiler options:
add_executable(foo main.cpp)
target_link_libraries(foo PRIVATE picon)
add_executable(bar main.cpp)
target_link_libraries(bar PRIVATE picoff)
Or:
add_library(cxx11features INTERFACE)
set_property(TARGET cxx11features
INTERFACE_COMPILE_OPTIONS
$<$<CXX_COMPILER_ID:GNU>:-std=c++0x>
$<$<CXX_COMPILER_ID:Clang>:-std=c++11>
)
set(IS_GNU $<CXX_COMPILER_ID:GNU>)
set(IS_46 $<VERSION_GREATER:$<CXX_COMPILER_VERSION>,4.6>)
set_property(TARGET cxx11features
INTERFACE_COMPILE_DEFINITIONS
$<$<AND:${IS_GNU},${IS_46}>:CXXFEATURES_NULLPTR_FOUND>
)
# Possibly also specify libcxx compiler option if using
# recent clang on apple.
...
add_executable(foo main.cpp)
target_link_libraries(foo cxx11features)
Thanks,
Steve.
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