fix missing spaces between build type flags and already set flags

fix predefined flags not taken into account for non-default targets

add support for wsize in C++ compiler detection

fix typo in compiler detection

more detailed output about build config

fix syntax error in check_cpp_compiler C++ test file

fixes wrong indentation

improve toolchain detection to also get the wordsize and stdc version, issue #439, issue #508

move debug/release flags from target to general flags, fixes #571

add configure command line to config.mk, fixes #563

(0) -100 -10 +10 tip

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