Autoconf 2.70 or AC_PROG_CC_C99 for earlier is checking for C99
It is no longer necessary to add it to CFLAGS/CPPFLAGS later.
CFLAGS
CPPFLAGS
Furthermore, as CPPFLAGS is used also with C++ compiler, the option particular to C such as -std=gnu99 results in an error.
-std=gnu99
Added by nobu (Nobuyoshi Nakada) almost 3 years ago
Autoconf 2.70 or AC_PROG_CC_C99 for earlier is checking for C99
It is no longer necessary to add it to
CFLAGS/CPPFLAGSlater.Furthermore, as
CPPFLAGSis used also with C++ compiler, the optionparticular to C such as
-std=gnu99results in an error.