Hi,
On Fri, 11 Apr 2008, Stephan Kulow wrote:
glibc 2.8 no longer defines ARG_MAX constant in linux, so you may see:
foobar.c:N: error: 'ARG_MAX' undeclared (first use in this function)
Note, that the code should have done that before too, as the glibc info
pages say:
Each of the following limit parameters has a macro that is defined in
`limits.h' only if the system has a fixed, uniform limit for the
parameter in question. If the system allows different file systems or
files to have different limits, then the macro is undefined; use
`sysconf' to find out the limit that applies at a particular time on a
particular machine.
Sometimes it's also that an include of is just missing (e.g.
for PATH_MAX). Older glibc could possibly include limits.h indirectly
with other headers, so nobody noticed it missing, now you do.
There's also one other problem which happened from time to time: "struct
ucred" (from (really )) is a GNU extension,
and therefore has to be guarded by -D_GNU_SOURCE. In older glibcs this
accidentally wasn't the case and some programs came to rely on this. For
those programs/files you need to define _GNU_SOURCE before the inclusion
of the first header (or in CFLAGS).
Ciao,
Michael.
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