1 files changed, 79 insertions, 0 deletions
diff --git a/scripts/mk/buildflags.mk b/scripts/mk/buildflags.mk
new file mode 100644
index 0000000..4b8a3d8
--- /dev/null
+++ b/scripts/mk/buildflags.mk
@@ -0,0 +1,79 @@
+# This Makefile fragment (since dpkg 1.16.1) defines the following host
+# variables:
+#
+#   ASFLAGS: flags for the host assembler (since 1.21.0).
+#   CFLAGS: flags for the host C compiler.
+#   CPPFLAGS: flags for the host C preprocessor.
+#   CXXFLAGS: flags for the host C++ compiler.
+#   OBJCFLAGS: flags for the host Objective C compiler.
+#   OBJCXXFLAGS: flags for the host Objective C++ compiler.
+#   DFLAGS: flags for the host D compiler.
+#   FFLAGS: flags for the host Fortran 77 compiler.
+#   FCFLAGS: flags for the host Fortran 9x compiler.
+#   LDFLAGS: flags for the host linker.
+#
+# And the following variables for the build tools (since dpkg 1.22.1):
+#
+#   ASFLAGS_FOR_BUILD: flags for the build assembler.
+#   CFLAGS_FOR_BUILD: flags for the build C compiler.
+#   CPPFLAGS_FOR_BUILD: flags for the build C preprocessor.
+#   CXXFLAGS_FOR_BUILD: flags for the build C++ compiler.
+#   OBJCFLAGS_FOR_BUILD: flags for the build Objective C compiler.
+#   OBJCXXFLAGS_FOR_BUILD: flags for the build Objective C++ compiler.
+#   DFLAGS_FOR_BUILD: flags for the build D compiler.
+#   FFLAGS_FOR_BUILD: flags for the build Fortran 77 compiler.
+#   FCFLAGS_FOR_BUILD: flags for the build Fortran 9x compiler.
+#   LDFLAGS_FOR_BUILD: flags for the build 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)))$$(value DPKG_CACHE_$(1)))
+
+DPKG_BUILDFLAGS_LIST = \
+  ASFLAGS \
+  ASFLAGS_FOR_BUILD \
+  CFLAGS \
+  CFLAGS_FOR_BUILD \
+  CPPFLAGS \
+  CPPFLAGS_FOR_BUILD \
+  CXXFLAGS \
+  CXXFLAGS_FOR_BUILD \
+  OBJCFLAGS \
+  OBJCFLAGS_FOR_BUILD \
+  OBJCXXFLAGS \
+  OBJCXXFLAGS_FOR_BUILD \
+  DFLAGS \
+  DFLAGS_FOR_BUILD \
+  FFLAGS \
+  FFLAGS_FOR_BUILD \
+  FCFLAGS \
+  FCFLAGS_FOR_BUILD \
+  LDFLAGS \
+  LDFLAGS_FOR_BUILD \
+  # EOL
+
+define dpkg_buildflags_export_envvar
+  ifdef $(1)
+    DPKG_BUILDFLAGS_EXPORT_ENVVAR += $(1)="$$(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