You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
2.1 KiB
65 lines
2.1 KiB
# - Try to find how to link to the standard math library, if anything at all is needed to do.
|
|
# On most platforms this is automatic, but for example it's not automatic on QNX.
|
|
#
|
|
# Once done this will define
|
|
#
|
|
# STANDARD_MATH_LIBRARY_FOUND - we found how to successfully link to the standard math library
|
|
# STANDARD_MATH_LIBRARY - the name of the standard library that one has to link to.
|
|
# -- this will be left empty if it's automatic (most platforms).
|
|
# -- this will be set to "m" on platforms where one must explicitly
|
|
# pass the "-lm" linker flag.
|
|
#
|
|
# Copyright (c) 2010 Benoit Jacob <jacob.benoit.1@gmail.com>
|
|
# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
|
|
|
|
|
|
include(CheckCXXSourceCompiles)
|
|
|
|
# a little test program for c++ math functions.
|
|
# notice the std:: is required on some platforms such as QNX
|
|
|
|
set(find_standard_math_library_test_program
|
|
"#include<cmath>
|
|
int main() { std::sin(0.0); std::log(0.0f); }")
|
|
|
|
# first try compiling/linking the test program without any linker flags
|
|
|
|
set(CMAKE_REQUIRED_FLAGS "")
|
|
set(CMAKE_REQUIRED_LIBRARIES "")
|
|
CHECK_CXX_SOURCE_COMPILES(
|
|
"${find_standard_math_library_test_program}"
|
|
standard_math_library_linked_to_automatically
|
|
)
|
|
|
|
if(standard_math_library_linked_to_automatically)
|
|
|
|
# the test program linked successfully without any linker flag.
|
|
set(STANDARD_MATH_LIBRARY "")
|
|
set(STANDARD_MATH_LIBRARY_FOUND TRUE)
|
|
|
|
else()
|
|
|
|
# the test program did not link successfully without any linker flag.
|
|
# This is a very uncommon case that so far we only saw on QNX. The next try is the
|
|
# standard name 'm' for the standard math library.
|
|
|
|
set(CMAKE_REQUIRED_LIBRARIES "m")
|
|
CHECK_CXX_SOURCE_COMPILES(
|
|
"${find_standard_math_library_test_program}"
|
|
standard_math_library_linked_to_as_m)
|
|
|
|
if(standard_math_library_linked_to_as_m)
|
|
|
|
# the test program linked successfully when linking to the 'm' library
|
|
set(STANDARD_MATH_LIBRARY "m")
|
|
set(STANDARD_MATH_LIBRARY_FOUND TRUE)
|
|
|
|
else()
|
|
|
|
# the test program still doesn't link successfully
|
|
set(STANDARD_MATH_LIBRARY_FOUND FALSE)
|
|
|
|
endif()
|
|
|
|
endif()
|