home *** CD-ROM | disk | FTP | other *** search
- ## ----------------------------------------- ##
- ## ANSIfy the C compiler whenever possible. ##
- ## From Franc,ois Pinard ##
- ## ----------------------------------------- ##
-
- # serial 1
-
- # @defmac AC_PROG_CC_STDC
- # @maindex PROG_CC_STDC
- # @ovindex CC
- # If the C compiler in not in ANSI C mode by default, try to add an option
- # to output variable @code{CC} to make it so. This macro tries various
- # options that select ANSI C on some system or another. It considers the
- # compiler to be in ANSI C mode if it defines @code{__STDC__} to 1 and
- # handles function prototypes correctly.
- #
- # If you use this macro, you should check after calling it whether the C
- # compiler has been set to accept ANSI C; if not, the shell variable
- # @code{am_cv_prog_cc_stdc} is set to @samp{no}. If you wrote your source
- # code in ANSI C, you can make an un-ANSIfied copy of it by using the
- # program @code{ansi2knr}, which comes with Ghostscript.
- # @end defmac
-
- AC_DEFUN(AM_PROG_CC_STDC,
- [AC_REQUIRE([AC_PROG_CC])
- AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C)
- AC_CACHE_VAL(am_cv_prog_cc_stdc,
- [am_cv_prog_cc_stdc=no
- ac_save_CC="$CC"
- # Don't try gcc -ansi; that turns off useful extensions and
- # breaks some systems' header files.
- # AIX -qlanglvl=ansi
- # Ultrix and OSF/1 -std1
- # HP-UX -Aa -D_HPUX_SOURCE
- # SVR4 -Xc -D__EXTENSIONS__
- for ac_arg in "" -qlanglvl=ansi -std1 "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
- do
- CC="$ac_save_CC $ac_arg"
- AC_TRY_COMPILE(
- [#if !defined(__STDC__) || __STDC__ != 1
- choke me
- #endif
- ], [/* DYNIX/ptx V4.1.3 can't compile sys/stat.h with -Xc -D__EXTENSIONS__. */
- #ifdef _SEQUENT_
- # include <sys/types.h>
- # include <sys/stat.h>
- #endif
- int test (int i, double x);
- struct s1 {int (*f) (int a);};
- struct s2 {int (*f) (double a);};],
- [am_cv_prog_cc_stdc="$ac_arg"; break])
- done
- CC="$ac_save_CC"
- ])
- AC_MSG_RESULT($am_cv_prog_cc_stdc)
- case "x$am_cv_prog_cc_stdc" in
- x|xno) ;;
- *) CC="$CC $am_cv_prog_cc_stdc" ;;
- esac
- ])
-