Decouple toolchain configurations #56
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In preparation for cross-compilation support, the toolchain specific configurations have been decoupled from the build system. Preliminary checks have been added to determine the supported compilers, GCC and Clang. When 'CROSS_COMPILE' is set, the build system will honor it and set CC accordingly. Currently, only the GNU toolchain is supported for cross-compilation.
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In preparation for cross-compilation support, the toolchain specific configurations have been decoupled from the build system. Preliminary checks have been added to determine the supported compilers, GCC and Clang. When 'CROSS_COMPILE' is set, the build system will honor it and set CC accordingly. Currently, only the GNU toolchain is supported for cross-compilation.