generic: add usb_find_device_by_name helper

[openwrt/openwrt.git] / rules.mk

diff --git a/rules.mk b/rules.mk
index 23445bfaeed6d7a2642a1cd55becec9895fa5d0e..09b4f5447a9d6e56ab5ef3022375e6b49c4c5708 100644 (file)
--- a/rules.mk
+++ b/rules.mk
@@ -28,6 +28,10 @@ merge=$(subst $(space),,$(1))
 confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
 strip_last=$(patsubst %.$(lastword $(subst .,$(space),$(1))),%,$(1))
 
+define sep
+
+endef
+
 _SINGLE=export MAKEFLAGS=$(space);
 CFLAGS:=
 ARCH:=$(subst i486,i386,$(subst i586,i386,$(subst i686,i386,$(call qstrip,$(CONFIG_ARCH)))))
@@ -249,6 +253,16 @@ define include_mk
 $(eval -include $(if $(DUMP),,$(STAGING_DIR)/mk/$(strip $(1))))
 endef
 
+# Execute commands under flock
+# $(1) => The shell expression.
+# $(2) => The lock name. If not given, the global lock will be used.
+define locked
+       SHELL= \
+       $(STAGING_DIR_HOST)/bin/flock \
+               $(TMP_DIR)/.$(if $(2),$(strip $(2)),global).flock \
+               -c '$(subst ','\'',$(1))'
+endef
+
 # file extension
 ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))