Define _GNU_SOURCE when building contribs on Linux.

sb-posix:o-direct doesn't get grovelled without it.

diff --git a/contrib/asdf-module.mk b/contrib/asdf-module.mk
index 3f88bdb..9c32b23 100644 (file)
--- a/contrib/asdf-module.mk
+++ b/contrib/asdf-module.mk
@@ -21,6 +21,9 @@ ifeq (CYGWIN,$(findstring CYGWIN,$(UNAME)))
   # paths, either.
   CC:=$(shell cygpath -m $(shell readlink -fn $(shell which $(CC))))
 endif
+ifeq (Linux,$(UNAME))
+  EXTRA_CFLAGS=-D_GNU_SOURCE
+endif
 
 export CC SBCL EXTRA_CFLAGS EXTRA_LDFLAGS