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add_library(MathFunctions MathFunctions.cxx)
# should we use our own math functions
option(USE_MYMATH "Use tutorial provided math implementation" ON)
if (USE_MYMATH)
target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
# library that just does sqrt
add_library(SqrtLibrary STATIC
mysqrt.cxx
)
# link SqrtLibrary to tutorial_compiler_flags
target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
# does this system provide the log and exp functions?
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("
#include <cmath>
int main() {
std::log(1.0);
return 0;
}
" HAVE_LOG)
check_cxx_source_compiles("
#include <cmath>
int main() {
std::exp(1.0);
return 0;
}
" HAVE_EXP)
# add compile definitions
if(HAVE_LOG AND HAVE_EXP)
target_compile_definitions(SqrtLibrary
PRIVATE "HAVE_LOG" "HAVE_EXP"
)
endif()
target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
endif()
# state that anybody linking to us needs to include the current source dir
# to find MathFunctions.h, while we don't.
target_include_directories(MathFunctions
INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
)
# link MathFunctions to tutorial_compiler_flags
target_link_libraries(MathFunctions PUBLIC tutorial_compiler_flags)
# install libs
set(installable_libs MathFunctions tutorial_compiler_flags)
if(TARGET SqrtLibrary)
list(APPEND installable_libs SqrtLibrary)
endif()
install(TARGETS ${installable_libs} DESTINATION lib)
# install include headers
install(FILES MathFunctions.h DESTINATION include)
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