m4/mpd_depends.m4: add documentation

2017-01-26 09:45:25 +01:00 · 2017-01-26 09:45:25 +01:00 · 8d4ed1e988
commit 8d4ed1e988
parent add953fb6e
1 changed files with 5 additions and 0 deletions
--- a/m4/mpd_depends.m4
+++ b/m4/mpd_depends.m4
@ -1,3 +1,8 @@
+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