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Filename : buildflags.mk
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# 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