1 files changed, 46 insertions, 0 deletions
diff --git a/scripts/mk/buildflags.mk b/scripts/mk/buildflags.mk
new file mode 100644
index 0000000..9cef0c0
--- /dev/null
+++ b/scripts/mk/buildflags.mk
@@ -0,0 +1,46 @@
+# This Makefile fragment (since dpkg 1.16.1) defines the following variables:
+#
+#   ASFLAGS: flags for the assembler (since 1.21.0).
+#   CFLAGS: flags for the C compiler.
+#   CPPFLAGS: flags for the C preprocessor.
+#   CXXFLAGS: flags for the C++ compiler.
+#   OBJCFLAGS: flags for the Objective C compiler.
+#   OBJCXXFLAGS: flags for the Objective C++ compiler.
+#   GCJFLAGS: flags for the GNU Java compiler.
+#   DFLAGS: flags for the D compiler.
+#   FFLAGS: flags for the Fortran 77 compiler.
+#   FCFLAGS: flags for the Fortran 9x compiler.
+#   LDFLAGS: flags for the linker.
+#
+# You can also export them in the environment by setting
+# DPKG_EXPORT_BUILDFLAGS to a non-empty value.
+#
+# This list is kept in sync with the default set of flags returned
+# by dpkg-buildflags.
+
+dpkg_lazy_eval ?= $$(or $$(value DPKG_CACHE_$(1)),$$(eval DPKG_CACHE_$(1) := $$(shell $(2)))$$(value DPKG_CACHE_$(1)))
+
+DPKG_BUILDFLAGS_LIST = ASFLAGS CFLAGS CPPFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS \
+                       GCJFLAGS DFLAGS FFLAGS FCFLAGS LDFLAGS
+
+define dpkg_buildflags_export_envvar
+  ifdef $(1)
+    DPKG_BUILDFLAGS_EXPORT_ENVVAR += $(1)="$$(value $(1))"
+  endif
+endef
+
+$(eval $(call dpkg_buildflags_export_envvar,DEB_BUILD_OPTIONS))
+$(eval $(call dpkg_buildflags_export_envvar,DEB_BUILD_MAINT_OPTIONS))
+$(eval $(call dpkg_buildflags_export_envvar,DEB_BUILD_PATH))
+$(foreach flag,$(DPKG_BUILDFLAGS_LIST),\
+  $(foreach operation,SET STRIP APPEND PREPEND,\
+    $(eval $(call dpkg_buildflags_export_envvar,DEB_$(flag)_MAINT_$(operation)))))
+
+dpkg_buildflags_setvar = $(1) = $(call dpkg_lazy_eval,$(1),$(DPKG_BUILDFLAGS_EXPORT_ENVVAR) dpkg-buildflags --get $(1))
+
+$(foreach flag,$(DPKG_BUILDFLAGS_LIST),\
+  $(eval $(call dpkg_buildflags_setvar,$(flag))))
+
+ifdef DPKG_EXPORT_BUILDFLAGS
+  export $(DPKG_BUILDFLAGS_LIST)
+endif