| 1 | ## ----------------------------------------- ##
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| 2 | ## ANSIfy the C compiler whenever possible. ##
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| 3 | ## From Franc,ois Pinard ##
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| 4 | ## ----------------------------------------- ##
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| 5 |
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| 6 | # serial 1
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| 7 |
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| 8 | # @defmac AC_PROG_CC_STDC
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| 9 | # @maindex PROG_CC_STDC
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| 10 | # @ovindex CC
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| 11 | # If the C compiler in not in ANSI C mode by default, try to add an option
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| 12 | # to output variable @code{CC} to make it so. This macro tries various
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| 13 | # options that select ANSI C on some system or another. It considers the
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| 14 | # compiler to be in ANSI C mode if it handles function prototypes correctly.
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| 15 | #
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| 16 | # If you use this macro, you should check after calling it whether the C
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| 17 | # compiler has been set to accept ANSI C; if not, the shell variable
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| 18 | # @code{am_cv_prog_cc_stdc} is set to @samp{no}. If you wrote your source
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| 19 | # code in ANSI C, you can make an un-ANSIfied copy of it by using the
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| 20 | # program @code{ansi2knr}, which comes with Ghostscript.
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| 21 | # @end defmac
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| 22 |
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| 23 | AC_DEFUN([AM_PROG_CC_STDC],
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| 24 | [AC_REQUIRE([AC_PROG_CC])
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| 25 | AC_BEFORE([$0], [AC_C_INLINE])
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| 26 | AC_BEFORE([$0], [AC_C_CONST])
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| 27 | dnl Force this before AC_PROG_CPP. Some cpp's, eg on HPUX, require
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| 28 | dnl a magic option to avoid problems with ANSI preprocessor commands
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| 29 | dnl like #elif.
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| 30 | dnl FIXME: can't do this because then AC_AIX won't work due to a
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| 31 | dnl circular dependency.
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| 32 | dnl AC_BEFORE([$0], [AC_PROG_CPP])
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| 33 | AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C)
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| 34 | AC_CACHE_VAL(am_cv_prog_cc_stdc,
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| 35 | [am_cv_prog_cc_stdc=no
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| 36 | ac_save_CC="$CC"
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| 37 | # Don't try gcc -ansi; that turns off useful extensions and
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| 38 | # breaks some systems' header files.
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| 39 | # AIX -qlanglvl=ansi
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| 40 | # Ultrix and OSF/1 -std1
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| 41 | # HP-UX -Aa -D_HPUX_SOURCE
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| 42 | # SVR4 -Xc -D__EXTENSIONS__
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| 43 | for ac_arg in "" -qlanglvl=ansi -std1 "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
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| 44 | do
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| 45 | CC="$ac_save_CC $ac_arg"
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| 46 | AC_TRY_COMPILE(
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| 47 | [#include <stdarg.h>
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| 48 | #include <stdio.h>
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| 49 | #include <sys/types.h>
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| 50 | #include <sys/stat.h>
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| 51 | /* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
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| 52 | struct buf { int x; };
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| 53 | FILE * (*rcsopen) (struct buf *, struct stat *, int);
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| 54 | static char *e (p, i)
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| 55 | char **p;
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| 56 | int i;
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| 57 | {
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| 58 | return p[i];
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| 59 | }
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| 60 | static char *f (char * (*g) (char **, int), char **p, ...)
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| 61 | {
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| 62 | char *s;
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| 63 | va_list v;
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| 64 | va_start (v,p);
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| 65 | s = g (p, va_arg (v,int));
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| 66 | va_end (v);
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| 67 | return s;
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| 68 | }
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| 69 | int test (int i, double x);
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| 70 | struct s1 {int (*f) (int a);};
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| 71 | struct s2 {int (*f) (double a);};
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| 72 | int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
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| 73 | int argc;
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| 74 | char **argv;
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| 75 | ], [
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| 76 | return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];
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| 77 | ],
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| 78 | [am_cv_prog_cc_stdc="$ac_arg"; break])
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| 79 | done
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| 80 | CC="$ac_save_CC"
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| 81 | ])
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| 82 | if test -z "$am_cv_prog_cc_stdc"; then
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| 83 | AC_MSG_RESULT([none needed])
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| 84 | else
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| 85 | AC_MSG_RESULT($am_cv_prog_cc_stdc)
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| 86 | fi
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| 87 | case "x$am_cv_prog_cc_stdc" in
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| 88 | x|xno) ;;
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| 89 | *) CC="$CC $am_cv_prog_cc_stdc" ;;
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| 90 | esac
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| 91 | ])
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