/usr/share/dpkg/buildflags.mk is in dpkg-dev 1.16.18.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | # This Makefile snippet defines the following variables:
#
# CFLAGS: flags for the C compiler
# CPPFLAGS: flags for the C preprocessor
# CXXFLAGS: flags for the C++ compiler
# FFLAGS: flags for the Fortran 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_late_eval ?= $(or $(value DPKG_CACHE_$(1)),$(eval DPKG_CACHE_$(1) := $(shell $(2)))$(value DPKG_CACHE_$(1)))
DPKG_BUILDFLAGS_LIST = CFLAGS CPPFLAGS CXXFLAGS FFLAGS 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_MAINT_OPTIONS))
$(foreach flag,$(DPKG_BUILDFLAGS_LIST),\
$(foreach operation,SET STRIP APPEND PREPEND,\
$(eval $(call dpkg_buildflags_export_envvar,DEB_$(flag)_MAINT_$(operation)))))
dpkg_buildflags_setvar = $(1) = $(call dpkg_late_eval,$(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
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