clar: define feature macros in "clar.c" #106
Merged
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Compiling clar requires several different extensions which are not part
of ISO C90, like strdup(3P), lstat(3P) and mkdtemp(3P). And while we
define these via our CMake build instructions, downstream users do not
benefit from this and will have to make sure that they set these.
Let's instead pull the definitions into "clar.c" such that the macros
are defined for everyone.