m4/mpd_depends.m4: add documentation

8d4ed1e9 · Max Kellermann · add953fb · 8d4ed1e9
Commit 8d4ed1e9 authored Jan 26, 2017 by Max Kellermann
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mpd_depends.m4 m4/mpd_depends.m4 +5 -0

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--- a/m4/mpd_depends.m4
+++ b/m4/mpd_depends.m4
+dnl Declare a dependency of one feature on another.  If the depending
+dnl feature is disabled, the former must be disabled as well.  If the
+dnl former was explicitly enabled, abort with an error message.
+dnl
+dnl Parameters: varname1, varname2 (=dependency), errmsg
 AC_DEFUN([MPD_DEPENDS], [
 	if test x$$2 = xno; then
 		if test x$$1 = xauto; then