Jack Stalnaker wrote: > Hi, > > I'm having trouble with check_function_exists() when it comes to built-in > functions in gcc. If I create just a simple C++ file with a call to sqrt() > or pow() and have a CMakeLists.txt with the following lines, > > include (CheckFunctionExists) > check_function_exists(sqrt HAVE_SQRT) > > cmake fails to find sqrt (or pow, log, exp, etc). In the sqrt case, > CMakeError.log shows > > /usr/share/cmake/Modules/CheckFunctionExists.c:3: warning: conflicting > types for built-in function 'sqrt' > Linking C executable cmTryCompileExec > /usr/bin/cmake -E cmake_link_script > CMakeFiles/cmTryCompileExec.dir/link.txt --verbose=1 > /usr/bin/gcc -DCHECK_FUNCTION_EXISTS=sqrt -fPIC > CMakeFiles/cmTryCompileExec.dir/CheckFunctionExists.c.o -o cmTryCompileExec > -rdynamic > CMakeFiles/cmTryCompileExec.dir/CheckFunctionExists.c.o: In function > 'main': > CheckFunctionExists.c:(.text+0x15): undefined reference to 'sqrt' > > What is the workaround for this, in the situation where the function is > built in, but I want to test for it on other platforms?
set(CMAKE_REQUIRED_INCLUDES math.h) set(CMAKE_REQUIRED_LIBRARIES m) Eike --
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