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118 lines
3.6 KiB
Plaintext
118 lines
3.6 KiB
Plaintext
dnl The following are from prerelease autoconf 2.14a. When 2.14 is
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dnl released, we should be able to zap them and AC_PREREQ(2.14).
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# AC_PROG_CC_STDC
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# ---------------
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# If the C compiler in not in ANSI C mode by default, try to add an
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# option to output variable @code{CC} to make it so. This macro tries
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# various options that select ANSI C on some system or another. It
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# considers the compiler to be in ANSI C mode if it handles function
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# prototypes correctly.
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AC_DEFUN(AC_PROG_CC_STDC,
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[AC_REQUIRE([AC_PROG_CC])dnl
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AC_BEFORE([$0], [AC_C_INLINE])dnl
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AC_BEFORE([$0], [AC_C_CONST])dnl
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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 ${CC-cc} option to accept ANSI C)
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AC_CACHE_VAL(ac_cv_prog_cc_stdc,
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[ac_cv_prog_cc_stdc=no
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ac_save_CC="$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 10.20 and later -Ae
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# HP-UX older versions -Aa -D_HPUX_SOURCE
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# SVR4 -Xc -D__EXTENSIONS__
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for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-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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[return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];],
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[ac_cv_prog_cc_stdc="$ac_arg"; break])
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done
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CC="$ac_save_CC"
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])
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case "x$ac_cv_prog_cc_stdc" in
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x|xno)
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AC_MSG_RESULT([none needed]) ;;
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*)
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AC_MSG_RESULT($ac_cv_prog_cc_stdc)
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CC="$CC $ac_cv_prog_cc_stdc" ;;
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esac
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])# AC_PROG_CC_STDC
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# AC_C_VOLATILE
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# -------------
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# Note that, unlike const, #defining volatile to be the empty string can
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# actually turn a correct program into an incorrect one, since removing
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# uses of volatile actually grants the compiler permission to perform
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# optimizations that could break the user's code. So, do not #define
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# volatile away unless it is really necessary to allow the user's code
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# to compile cleanly. Benign compiler failures should be tolerated.
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AC_DEFUN(AC_C_VOLATILE,
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[AC_REQUIRE([AC_PROG_CC_STDC])dnl
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AC_CACHE_CHECK([for working volatile], ac_cv_c_volatile,
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[AC_TRY_COMPILE(,[
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volatile int x;
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int * volatile y;],
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ac_cv_c_volatile=yes, ac_cv_c_volatile=no)])
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if test $ac_cv_c_volatile = no; then
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AC_DEFINE(volatile,,
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[Define to empty if the keyword `volatile' does not work.
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Warning: valid code using `volatile' can become incorrect
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without. Disable with care.])
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fi
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])
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# AC_C_PROTOTYPES
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# ---------------
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# Check if the C compiler supports prototypes, included if it needs
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# options.
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AC_DEFUN(AC_C_PROTOTYPES,
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[AC_REQUIRE([AC_PROG_CC_STDC])dnl
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AC_REQUIRE([AC_PROG_CPP])dnl
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AC_MSG_CHECKING([for function prototypes])
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if test "$ac_cv_prog_cc_stdc" != no; then
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AC_MSG_RESULT(yes)
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AC_DEFINE(PROTOTYPES, 1,
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[Define if the compiler supports function prototypes.])
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else
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AC_MSG_RESULT(no)
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fi
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])# AC_C_PROTOTYPES
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