dnl The following are from prerelease autoconf 2.14a. When 2.14 is dnl released, we should be able to zap them and AC_PREREQ(2.14). # AC_PROG_CC_STDC # --------------- # 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 handles function # prototypes correctly. AC_DEFUN(AC_PROG_CC_STDC, [AC_REQUIRE([AC_PROG_CC])dnl AC_BEFORE([$0], [AC_C_INLINE])dnl AC_BEFORE([$0], [AC_C_CONST])dnl dnl Force this before AC_PROG_CPP. Some cpp's, eg on HPUX, require dnl a magic option to avoid problems with ANSI preprocessor commands dnl like #elif. dnl FIXME: can't do this because then AC_AIX won't work due to a dnl circular dependency. dnl AC_BEFORE([$0], [AC_PROG_CPP]) AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C) AC_CACHE_VAL(ac_cv_prog_cc_stdc, [ac_cv_prog_cc_stdc=no ac_save_CC="$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 10.20 and later -Ae # HP-UX older versions -Aa -D_HPUX_SOURCE # SVR4 -Xc -D__EXTENSIONS__ for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__" do CC="$ac_save_CC $ac_arg" AC_TRY_COMPILE( [#include #include #include #include /* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */ struct buf { int x; }; FILE * (*rcsopen) (struct buf *, struct stat *, int); static char *e (p, i) char **p; int i; { return p[i]; } static char *f (char * (*g) (char **, int), char **p, ...) { char *s; va_list v; va_start (v,p); s = g (p, va_arg (v,int)); va_end (v); return s; } int test (int i, double x); struct s1 {int (*f) (int a);}; struct s2 {int (*f) (double a);}; int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int); int argc; char **argv;], [return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];], [ac_cv_prog_cc_stdc="$ac_arg"; break]) done CC="$ac_save_CC" ]) case "x$ac_cv_prog_cc_stdc" in x|xno) AC_MSG_RESULT([none needed]) ;; *) AC_MSG_RESULT($ac_cv_prog_cc_stdc) CC="$CC $ac_cv_prog_cc_stdc" ;; esac ])# AC_PROG_CC_STDC # AC_C_VOLATILE # ------------- # Note that, unlike const, #defining volatile to be the empty string can # actually turn a correct program into an incorrect one, since removing # uses of volatile actually grants the compiler permission to perform # optimizations that could break the user's code. So, do not #define # volatile away unless it is really necessary to allow the user's code # to compile cleanly. Benign compiler failures should be tolerated. AC_DEFUN(AC_C_VOLATILE, [AC_REQUIRE([AC_PROG_CC_STDC])dnl AC_CACHE_CHECK([for working volatile], ac_cv_c_volatile, [AC_TRY_COMPILE(,[ volatile int x; int * volatile y;], ac_cv_c_volatile=yes, ac_cv_c_volatile=no)]) if test $ac_cv_c_volatile = no; then AC_DEFINE(volatile,, [Define to empty if the keyword `volatile' does not work. Warning: valid code using `volatile' can become incorrect without. Disable with care.]) fi ]) # AC_C_PROTOTYPES # --------------- # Check if the C compiler supports prototypes, included if it needs # options. AC_DEFUN(AC_C_PROTOTYPES, [AC_REQUIRE([AC_PROG_CC_STDC])dnl AC_REQUIRE([AC_PROG_CPP])dnl AC_MSG_CHECKING([for function prototypes]) if test "$ac_cv_prog_cc_stdc" != no; then AC_MSG_RESULT(yes) AC_DEFINE(PROTOTYPES, 1, [Define if the compiler supports function prototypes.]) else AC_MSG_RESULT(no) fi ])# AC_C_PROTOTYPES