[lwip-devel] [bug #51463] posix/errno.h incompatible with LWIP_ERRNO_STDINCLUDE

[Joel Cunningham]

Follow-up Comment #4, bug #51463 (project lwip):

> In other words, having both LWIP_ERRNO_STDINCLUDE==1 and the "include/posix"
in your include paths is not meant to work (yet?) ;-)

Thinking about this more, the posix/errno.h with LWIP_PROVIDE_ERRNO == 1 is
only safe if the C library doesn't also provide errno.h because other source
files in the project may be compiled against the standard C library version
(depending on include paths during compilation) and you'll end up with a
binary incompatibility between object files if underlying values don't match. 


Have you worked with embedded toolchains where errno.h is not provided by the
standard C library?  I typically use the ARM C Compiler and GCC ARM Embedded,
both provide errno.h, but none of the BSD socket (later standardized to POSIX)
headers.

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