use target_compile_definitions to build backend within another project #54
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When you include this cmake project as a "subproject" of another project, CMake complains in Windows (MSVC) that it cannot find
M_PI
because-D_USE_MATH_DEFINES
is not defined. (Actually it does something really funky if I add#define _USE_MATH_DEFINES
to the source files. The compiler complains that_USE_MATH_DEFINES
has already been defined despite it's not.)Anyway, this PR fixes this issue by using per-project
target_compile_definitions
cmake command instead ofadd_definition
.