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-rw-r--r--Makefile1
-rw-r--r--package/pkg-generic.mk9
2 files changed, 10 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 8e3f6572d5..caf4a919a8 100644
--- a/Makefile
+++ b/Makefile
@@ -334,6 +334,7 @@ unexport O
GNU_HOST_NAME := $(shell support/gnuconfig/config.guess)
PACKAGES :=
+PACKAGES_ALL :=
# silent mode requested?
QUIET := $(if $(findstring s,$(filter-out --%,$(MAKEFLAGS))),-q)
diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index 8b189fed2c..1ae0315b95 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -341,6 +341,14 @@ endef
define inner-generic-package
+# Ensure the package is only declared once, i.e. do not accept that a
+# package be re-defined by a br2-external tree
+ifneq ($(call strip,$(filter $(1),$(PACKAGES_ALL))),)
+$$(error Package '$(1)' defined a second time in '$(pkgdir)'; \
+ previous definition was in '$$($(2)_PKGDIR)')
+endif
+PACKAGES_ALL += $(1)
+
# Define default values for various package-related variables, if not
# already defined. For some variables (version, source, site and
# subdir), if they are undefined, we try to see if a variable without
@@ -351,6 +359,7 @@ define inner-generic-package
$(2)_TYPE = $(4)
$(2)_NAME = $(1)
$(2)_RAWNAME = $$(patsubst host-%,%,$(1))
+$(2)_PKGDIR = $(pkgdir)
# Keep the package version that may contain forward slashes in the _DL_VERSION
# variable, then replace all forward slashes ('/') by underscores ('_') to
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