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.
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?
Also notice, that older C++ standard libraries and non-compliant C++
compilers don't use the namespace std. You might want to have a look
at CMakeBackwardCompatibilityCXX.cmake or the various other modules
it uses.
Yes, I know this problem quite well.
However, I rarely work with such old or incompatible libraries.
IMHO, CMake should be able to handle standard C++ definitions
and let users to deal with incompatibilities.
Best regards,
--
Mateusz Loskot, http://mateusz.loskot.net
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