| 1 | # =========================================================================== |
| 2 | # https://www.gnu.org/software/autoconf-archive/ax_require_defined.html |
| 3 | # =========================================================================== |
| 4 | # |
| 5 | # SYNOPSIS |
| 6 | # |
| 7 | # AX_REQUIRE_DEFINED(MACRO) |
| 8 | # |
| 9 | # DESCRIPTION |
| 10 | # |
| 11 | # AX_REQUIRE_DEFINED is a simple helper for making sure other macros have |
| 12 | # been defined and thus are available for use. This avoids random issues |
| 13 | # where a macro isn't expanded. Instead the configure script emits a |
| 14 | # non-fatal: |
| 15 | # |
| 16 | # ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found |
| 17 | # |
| 18 | # It's like AC_REQUIRE except it doesn't expand the required macro. |
| 19 | # |
| 20 | # Here's an example: |
| 21 | # |
| 22 | # AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG]) |
| 23 | # |
| 24 | # LICENSE |
| 25 | # |
| 26 | # Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org> |
| 27 | # |
| 28 | # Copying and distribution of this file, with or without modification, are |
| 29 | # permitted in any medium without royalty provided the copyright notice |
| 30 | # and this notice are preserved. This file is offered as-is, without any |
| 31 | # warranty. |
| 32 | |
| 33 | #serial 2 |
| 34 | |
| 35 | AC_DEFUN([AX_REQUIRE_DEFINED], [dnl |
| 36 | m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])]) |
| 37 | ])dnl AX_REQUIRE_DEFINED |