Some old compilers do not use C99 as their default C language variant,
for example gcc 4.3.x, which is used on some old machines. When such a
compiler is used, by default, ULLONG_MAX is not visible. Adding
-std=gnu99 is needed to make this definition visible.
In autoconf speak, this translates into the need of using
AC_PROC_CC_STDC instead of AC_PROG_CC. See
http://www.gnu.org/software/autoconf/manual/autoconf-2.65/html_node/C-Compiler.html
for more details.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
AC_SYS_LARGEFILE
# Checks for programs.
-AC_PROG_CC
+AC_PROG_CC_STDC
AC_PROG_MAKE_SET
LT_INIT
AC_PROG_YACC