Michael Wild wrote:
On 21. Jan, 2010, at 16:44 , Mateusz Loskot wrote:
Michael Wild wrote:
On 21. Jan, 2010, at 24:55 , Mateusz Loskot wrote:
Hi, I'm trying to perform the following checks:
check_function_exists(std::pow HAVE_POW) or
check_symbol_exists(std::pow cmath HAVE_POW) but it looks that
both macros have troubles with resolving std:: namespace. The
documentation is not very clear about that. Or I should stick
to try_compile based tests? Best regards,
AFAIK check_symbol_exists is used for preprocessor symbols.
check_function_exists looks for C functions, not C++.
OK, makes sense: symbol -> preprocessor function -> real function
Although, for clarity, perhaps check_symbol_exists should be called
check_macro_exists.
No, as Marcel and I noticed, check_symbol_exists really checks
whether that symbol exists, be it preprocessor symbol, function or
global variable. Really, the docs should be updated to clarify this.
Gotcha. I haven't completed reading the thread yet.
The fact check_function_exists checks C function but not C++ free
function is a bit confusing. AFAIU, CMake is dedicated to build C++
source code, so I suppose many users may expect it works well for
both C and C++ free functions.
Why it can not work, actually?
Because the module writes a .c file and then compiles it with the
C-compiler... What one needs is CheckCXXFunctionExists and
CheckCXXSymbolExists. Or, alternatively, the modules could check the
enabled languages and if C++ is enabled, write a C++ file (that
should also work for C functions/symbols), otherwise fall back to
plain C.
Both options would work well of course.
However, the latter seems to be easier to integrate seamlessly with
current set of standard macros avaialble in CMake - implementations
changes only, not interface.
For the time being, it looks like I will need to maintain private
versions of CheckCXXFunctioExists in a project.
Thanks!
Best regards,
--
Mateusz Loskot, http://mateusz.loskot.net
_______________________________________________
Powered by www.kitware.com
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Follow this link to subscribe/unsubscribe:
http://www.cmake.org/mailman/listinfo/cmake
