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## ----------------------------------------- ##
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## ANSIfy the C compiler whenever possible. ##
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## From Franc,ois Pinard ##
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## ----------------------------------------- ##
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# serial 1
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# @defmac AC_PROG_CC_STDC
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# @maindex PROG_CC_STDC
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# @ovindex CC
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# If the C compiler in not in ANSI C mode by default, try to add an option
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# to output variable @code{CC} to make it so. This macro tries various
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# options that select ANSI C on some system or another. It considers the
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# compiler to be in ANSI C mode if it handles function prototypes correctly.
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#
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# If you use this macro, you should check after calling it whether the C
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# compiler has been set to accept ANSI C; if not, the shell variable
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# @code{am_cv_prog_cc_stdc} is set to @samp{no}. If you wrote your source
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# code in ANSI C, you can make an un-ANSIfied copy of it by using the
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# program @code{ansi2knr}, which comes with Ghostscript.
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# @end defmac
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AC_DEFUN(AM_PROG_CC_STDC,
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[AC_REQUIRE([AC_PROG_CC])
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AC_BEFORE([$0], [AC_C_INLINE])
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AC_BEFORE([$0], [AC_C_CONST])
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dnl Force this before AC_PROG_CPP. Some cpp's, eg on HPUX, require
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dnl a magic option to avoid problems with ANSI preprocessor commands
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dnl like #elif.
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dnl FIXME: can't do this because then AC_AIX won't work due to a
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dnl circular dependency.
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dnl AC_BEFORE([$0], [AC_PROG_CPP])
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AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C)
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AC_CACHE_VAL(am_cv_prog_cc_stdc,
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[am_cv_prog_cc_stdc=no
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ac_save_CC="$CC"
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# Don't try gcc -ansi; that turns off useful extensions and
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# breaks some systems' header files.
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# AIX -qlanglvl=ansi
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# Ultrix and OSF/1 -std1
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# HP-UX -Aa -D_HPUX_SOURCE
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# SVR4 -Xc -D__EXTENSIONS__
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for ac_arg in "" -qlanglvl=ansi -std1 "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
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do
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CC="$ac_save_CC $ac_arg"
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AC_TRY_COMPILE(
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[#include <stdarg.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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/* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
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struct buf { int x; };
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FILE * (*rcsopen) (struct buf *, struct stat *, int);
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static char *e (p, i)
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char **p;
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int i;
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{
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return p[i];
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}
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static char *f (char * (*g) (char **, int), char **p, ...)
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{
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char *s;
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va_list v;
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va_start (v,p);
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s = g (p, va_arg (v,int));
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va_end (v);
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return s;
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}
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int test (int i, double x);
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struct s1 {int (*f) (int a);};
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struct s2 {int (*f) (double a);};
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int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
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int argc;
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char **argv;
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], [
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return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];
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],
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[am_cv_prog_cc_stdc="$ac_arg"; break])
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done
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CC="$ac_save_CC"
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])
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if test -z "$am_cv_prog_cc_stdc"; then
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AC_MSG_RESULT([none needed])
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else
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AC_MSG_RESULT($am_cv_prog_cc_stdc)
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fi
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case "x$am_cv_prog_cc_stdc" in
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x|xno) ;;
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*) CC="$CC $am_cv_prog_cc_stdc" ;;
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esac
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])
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