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? Thanks
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