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Link with libm.so on those platforms that require it.

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This commit is contained in:
John Ralls
2020-07-06 12:24:49 -07:00
parent 43749a9495
commit 4ee573e23a
3 changed files with 60 additions and 3 deletions
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2
common/cmake_modules/CMakeLists.txt
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@@ -1,7 +1,7 @@
set(cmake_FILES
GncAddGSchemaTargets.cmake GncAddSchemeTargets.cmake
GncAddSwigCommand.cmake GncAddTest.cmake
GncAddSwigCommand.cmake GncAddTest.cmake GncFindLibm.cmake
MacroAddSourceFileCompileFlags.cmake MacroAppendForeach.cmake
MakeDist.cmake MakeDistFiles.cmake MakeDistCheck.cmake
)

46
common/cmake_modules/GncFindLibm.cmake Normal file
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@@ -0,0 +1,46 @@
# Copied & modified from https://android.googlesource.com/platform/external/eigen/+/master/cmake/FindStandardMathLibrary.cmake
# 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.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
#Detect whether this platform requires libm for pow().
include(CheckCXXSourceCompiles)
macro (gnc_check_standard_math_library)
set(find_standard_math_library_test_program
"
#include <math.h>
int main(int argc, char** argv)
{
double foo = pow(2.0, 2.0);
return foo == 4.0;
}"
)
set(CMAKE_REQUIRED_FLAGS "")
set(CMAKE_REQUIRED_LIBRARIES "")
check_c_source_compiles(
"${find_standard_math_library_test_program}"
standard_math_library_linked_to_automatically
)
if(standard_math_library_linked_to_automatically)
# the test program linked successfully without any linker flag.
set(STANDARD_MATH_LIBRARY "")
set(STANDARD_MATH_LIBRARY_FOUND TRUE)
else()
# the test program did not link successfully without any linker flag.
# Try again with standard name 'm' for the standard math library.
set(CMAKE_REQUIRED_LIBRARIES "m")
check_c_source_compiles(
"${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()
endmacro()