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Make sure compiler does not optimize away calls to math functions

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Susi Lehtola 2020-10-24 06:16:50 +00:00 committed by David Tellenbach
parent 28aef8e816
commit 09f595a269
1 changed files with 9 additions and 2 deletions
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11
cmake/FindStandardMathLibrary.cmake
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@ -10,6 +10,7 @@
# pass the "-lm" linker flag.
#
# Copyright (c) 2010 Benoit Jacob <jacob.benoit.1@gmail.com>
# 2020 Susi Lehtola <susi.lehtola@gmail.com>
# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
@ -19,9 +20,15 @@ include(CheckCXXSourceCompiles)
# notice the std:: is required on some platforms such as QNX
# notice the (void) is required if -Wall (-Wunused-value) is added to CMAKE_CXX_FLAG
# We read in the arguments from standard input to avoid the compiler optimizing away the calls
set(find_standard_math_library_test_program
"#include<cmath>
int main() { (void)std::sin(0.0); (void)std::log(0.0f); }")
"
#include<cmath>
int main(int argc, char **argv) {
(void)std::sin(argc));
(void)std::log(argc));
return 0;
}")
# first try compiling/linking the test program without any linker flags