On 31/07/2018 16:25, Ævar Arnfjörð Bjarmason wrote:
...the real trick is using these macros outside of GCC / glibc and on
older GCC versions. See the github link above, you basically end up with
a whitelist of how it looks on different systems / compilers. Sometimes
both are defined, sometimes only both etc.
It can be done, but as that code shows it's somewhat complex macro soup
to get right.
FYI - the gcc I was using is 4.7.4.
And, the reason I suggest the test for both not being defined is so that
'make' stops and whoever is running make just sets one or the other. Let
them 'file a bug' When they come with a compiler that does not work -
and find out what could be used.
For example, _AIX is the same as _BIG_ENDIAN. In the meantime, the code
to test is simple.
Either one of _BIG_ENDIAN or _LITTLE_ENDIAN is provided by the compiler
or the builder supplies one of the two using CFLAGS. I assume there is
also a "undefine" flag, maybe -U - so hopefully a -U and a -D
combination could be used for cross-compiling.
re: my mailer blocking things - it would only be for this list, as other
lists come through with no extra work from me. At least I am not aware
of anything special I could do.
