diff options
Diffstat (limited to 'macros/need-declaration.m4')
| -rw-r--r-- | macros/need-declaration.m4 | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/macros/need-declaration.m4 b/macros/need-declaration.m4 new file mode 100644 index 0000000..8a217b8 --- /dev/null +++ b/macros/need-declaration.m4 @@ -0,0 +1,42 @@ +dnl See whether we need a declaration for a function. +dnl GCC_NEED_DECLARATION(FUNCTION [, EXTRA-HEADER-FILES]) +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 +$2], +[char *(*pfn) = (char *(*)) $1], +eval "gcc_cv_decl_needed_$1=no", eval "gcc_cv_decl_needed_$1=yes")]) +if eval "test \"`echo '$gcc_cv_decl_needed_'$1`\" = yes"; then + AC_MSG_RESULT(yes) + gcc_need_declarations="$gcc_need_declarations $1" + gcc_tr_decl=NEED_DECLARATION_`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'` + AC_DEFINE_UNQUOTED($gcc_tr_decl) +else + AC_MSG_RESULT(no) +fi +])dnl + +dnl Check multiple functions to see whether each needs a declaration. +dnl GCC_NEED_DECLARATIONS(FUNCTION... [, EXTRA-HEADER-FILES]) +AC_DEFUN([GCC_NEED_DECLARATIONS], +[for ac_func in $1 +do +GCC_NEED_DECLARATION($ac_func, $2) +done +] +) |