In this case, CCAN_CFLAGS should be "".
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

In particular, HAVE_CLOCK_GETTIME_IN_LIBRT.

Needed for FIONREAD.

Header file was wrong, suncc gives warning about missing open prototype, causing configurator to fail.

An interesting case came up with the tdb2 code in SAMBA recently.  It's a
public library, and it doesn't want to be dependent on CCAN, but the header
uses cast and typesafe_cb for extra type safety.

A good solution to this is to put dummy versions under !HAVE_CCAN.  Of course,
any CCAN config.h should define HAVE_CCAN.

Just adding `-g' to list of CFLAGS doesn't make gcc to generate debug
information required for macro expansion during debugging. Replacing
it with `-g3 -ggdb' rectifies this.

(configurator.c commit folded by Rusty)

Douglas Bagnell noted that it didn't specify.

Makes it easier to reuse this code in other projects.

Defines whether it's useful to do #define _FILE_OFFSET_BITS 64 to get a
larger off_t.

This isn't on RHEL4, for example: isascii() and isblank() are not in
C89.

memmem(), which searches for one bytestring in a longer
bytestring is one of those functions that should be standard, but
isn't.  This patch adds a ccan configurator test for the function
so that modules can use or replace it as necessary.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Be a little more careful with const.

Thanks to Andreas Schlick, we have a nicer test for when gcc warns about
trampolines (gcc 4.6's -Wtrampolines).  This works at any optimization level,
and means when that warning is enabled we recognize that we shouldn't allow
nested functions.

Otherwise we don't get goodies like asprintf, and 64-bit offsets.  Should
be a harmless-define on non-glibc systems.

Unfortunately, gcc only warns if it sees an unknown attribute (in this case, gcc 4.1 vs "cold").

This means we can pass various compulation tests, but deduct points if
they get warnings.

A simple C program to generate config.h.  It also saves the compiler and
flags for use by ccanlint (though they have to accept -c and -o).