| dnl AX_CHECK_TYPEDEF(typedef_name, type, action-if-true, action-if-false) |
| dnl exec action-if-true if typedef_name is a typedef to type else exec |
| dnl action-if-false |
| dnl currently work only with type typedef'ed in stddef.h |
| AC_DEFUN([AX_CHECK_TYPEDEF], [ |
| dnl AC_LANG_PUSH(C) not in autoconf 2.13 |
| AC_LANG_SAVE |
| AC_LANG_C |
| SAVE_CFLAGS=$CFLAGS |
| CFLAGS="-Werror $CFLAGS" |
| |
| AC_TRY_COMPILE( |
| [ |
| #include <stddef.h> |
| ], |
| [ |
| typedef void (*fct1)($1); |
| typedef void (*fct2)($2); |
| fct1 f1 = 0; |
| fct2 f2 = 0; |
| if (f1 == f2) {} |
| ], |
| [$3],[$4]) |
| |
| CFLAGS=$SAVE_CFLAGS |
| AC_LANG_RESTORE |
| ]) |
| |
| |
| dnl AX_TYPEDEFED_NAME(typedef_name, candidate_list, var_name) |
| dnl set var_name to the typedef name of $1 which must be in canditate_list |
| dnl else produce a fatal error |
| AC_DEFUN([AX_TYPEDEFED_NAME], [ |
| AC_MSG_CHECKING([type of $1]) |
| for f in $2; do |
| AX_CHECK_TYPEDEF($1, $f, $3="$f", $3="") |
| if test -n "${$3}"; then |
| break |
| fi |
| done |
| if test -n "${$3}"; then |
| AC_MSG_RESULT([${$3}]) |
| else |
| AC_MSG_ERROR([not found]) |
| fi |
| ]) |
