| Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | dnl AX_CHECK_TYPEDEF(typedef_name, type, action-if-true, action-if-false) |
| 2 | dnl exec action-if-true if typedef_name is a typedef to type else exec |
| 3 | dnl action-if-false |
| 4 | dnl currently work only with type typedef'ed in stddef.h |
| 5 | AC_DEFUN([AX_CHECK_TYPEDEF], [ |
| 6 | dnl AC_LANG_PUSH(C) not in autoconf 2.13 |
| 7 | AC_LANG_SAVE |
| 8 | AC_LANG_C |
| 9 | SAVE_CFLAGS=$CFLAGS |
| 10 | CFLAGS="-Werror $CFLAGS" |
| 11 | |
| 12 | AC_TRY_COMPILE( |
| 13 | [ |
| 14 | #include <stddef.h> |
| 15 | ], |
| 16 | [ |
| 17 | typedef void (*fct1)($1); |
| 18 | typedef void (*fct2)($2); |
| 19 | fct1 f1 = 0; |
| 20 | fct2 f2 = 0; |
| 21 | if (f1 == f2) {} |
| 22 | ], |
| 23 | [$3],[$4]) |
| 24 | |
| 25 | CFLAGS=$SAVE_CFLAGS |
| 26 | AC_LANG_RESTORE |
| 27 | ]) |
| 28 | |
| 29 | |
| 30 | dnl AX_TYPEDEFED_NAME(typedef_name, candidate_list, var_name) |
| 31 | dnl set var_name to the typedef name of $1 which must be in canditate_list |
| 32 | dnl else produce a fatal error |
| 33 | AC_DEFUN([AX_TYPEDEFED_NAME], [ |
| 34 | AC_MSG_CHECKING([type of $1]) |
| 35 | for f in $2; do |
| 36 | AX_CHECK_TYPEDEF($1, $f, $3="$f", $3="") |
| 37 | if test -n "${$3}"; then |
| 38 | break |
| 39 | fi |
| 40 | done |
| 41 | if test -n "${$3}"; then |
| 42 | AC_MSG_RESULT([${$3}]) |
| 43 | else |
| 44 | AC_MSG_ERROR([not found]) |
| 45 | fi |
| 46 | ]) |