gcc/aclocal.m4

   1 dnl See whether we need a declaration for a function.
   2 AC_DEFUN(GCC_NEED_DECLARATION,
   3 [AC_MSG_CHECKING([whether $1 must be declared])
   4 AC_CACHE_VAL(gcc_cv_decl_needed_$1,
   5 [AC_TRY_COMPILE([
   6 #include <stdio.h>
   7 #ifdef HAVE_STRING_H
   8 #include <string.h>
   9 #else
  10 #ifdef HAVE_STRINGS_H
  11 #include <strings.h>
  12 #endif
  13 #endif
  14 #ifdef HAVE_STDLIB_H
  15 #include <stdlib.h>
  16 #endif
  17 #ifdef HAVE_UNISTD_H
  18 #include <unistd.h>
  19 #endif],
  20 [char *(*pfn) = (char *(*)) $1],
  21 gcc_cv_decl_needed_$1=no, gcc_cv_decl_needed_$1=yes)])
  22 AC_MSG_RESULT($gcc_cv_decl_needed_$1)
  23 if test $gcc_cv_decl_needed_$1 = yes; then
  24   gcc_tr_decl=NEED_DECLARATION_`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
  25   AC_DEFINE_UNQUOTED($gcc_tr_decl)
  26 fi
  27 ])dnl