| dnl See whether we need a declaration for a function. |
| AC_DEFUN(GCC_NEED_DECLARATION, |
| [AC_MSG_CHECKING([whether $1 must be declared]) |
| AC_CACHE_VAL(gcc_cv_decl_needed_$1, |
| [AC_TRY_COMPILE([ |
| #include <stdio.h> |
| #ifdef HAVE_STRING_H |
| #include <string.h> |
| #else |
| #ifdef HAVE_STRINGS_H |
| #include <strings.h> |
| #endif |
| #endif |
| #ifdef HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #ifndef HAVE_RINDEX |
| #define rindex strrchr |
| #endif |
| #ifndef HAVE_INDEX |
| #define index strchr |
| #endif], |
| [char *(*pfn) = (char *(*)) $1], |
| gcc_cv_decl_needed_$1=no, gcc_cv_decl_needed_$1=yes)]) |
| AC_MSG_RESULT($gcc_cv_decl_needed_$1) |
| if test $gcc_cv_decl_needed_$1 = yes; then |
| gcc_tr_decl=NEED_DECLARATION_`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'` |
| AC_DEFINE_UNQUOTED($gcc_tr_decl) |
| fi |
| ])dnl |
