add prototype definitions of asprintf and vasprintf for CYGWIN build

- define _GNU_SOURCE in case of cygwin As compilation warning report by @Dravion
2017-07-16 23:39:42 +09:00 · 2017-07-16 23:39:42 +09:00 · 5afc4e3cd8
commit 5afc4e3cd8
parent cefd44a86e
1 changed files with 1 additions and 0 deletions
--- a/m4/check-os-options.m4
+++ b/m4/check-os-options.m4
@ -13,6 +13,7 @@ case $host_os in
 		;;
 	*cygwin*)
 		HOST_OS=cygwin
+		CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
 		;;
 	*darwin*)
 		HOST_OS=darwin