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# General purpose pkg-config macros
# Determine if a package is available
# 1: Name of variable to assign result into
# 2: Name of package to search for
define pkg_config_package_available
ifeq ($$(PKGCONFIG),)
$$(error pkg-config is required to auto-detect package availability)
endif
ifeq ($$(shell $$(PKGCONFIG) --exists $(2) && echo yes),yes)
$(1) := yes
else
$(1) := no
endif
endef
# Retrieve the version of a package
# 1: Name of variable to assign result into
# 2: Name of package to search for
define pkg_config_package_version
ifeq ($$(PKGCONFIG),)
$$(error pkg-config is required to auto-detect package version)
endif
$(1) := $$(shell $$(PKGCONFIG) --modversion $(2))
endef
# Test the presence of a minimum version of a package
# 1: Name of variable to assign result into
# 2: Name of package to search for
# 3: Lowest accepted version number
define pkg_config_package_min_version
ifeq ($$(PKGCONFIG),)
$$(error pkg-config is required to auto-detect package version)
endif
ifeq ($$(shell $$(PKGCONFIG) --atleast-version=$(3) $(2) && echo yes),yes)
$(1) := yes
else
$(1) := no
endif
endef
# Test the presence of a minimum version of a package
# 1: Name of variable to assign result into
# 2: Name of package to search for
# 3: Lowest accepted version number
# 4: Highest accepted version number
define pkg_config_package_compare_version
ifeq ($$(PKGCONFIG),)
$$(error pkg-config is required to auto-detect package version)
endif
ifeq ($$(shell $$(PKGCONFIG) --atleast-version=$(3) $(2) && echo yes),yes)
ifeq ($$(shell $$(PKGCONFIG) --max-version=$(4) $(2) && echo yes),yes)
$(1) := yes
else
$(1) := no
endif
else
$(1) := no
endif
endef
# Add package to compiler/linker flags
# 1: Name of package to add details of
# 2: CFLAGS variable to extend, or none
# 3: LDFLAGS variable to extend, or none
define pkg_config_package_add_flags
ifeq ($$(PKGCONFIG),)
$$(error pkg-config is required to auto-detect package version)
endif
ifneq ($(2),)
$(2) := $$($(2)) $$(shell $$(PKGCONFIG) --cflags $(1))
endif
ifneq ($(3),)
$(3) := $$($(3)) $$(shell $$(PKGCONFIG) --libs $(1))
endif
endef
# Obtain the value of a pkg-config variable
# 1: Name of variable to assign result into
# 2: Name of package to search for
# 3: Name of pkg-config variable to retrieve
define pkg_config_get_variable
ifeq ($$(PKGCONFIG),)
$$(error pkg-config is required to auto-detect package version)
endif
$(1) := $$(shell $$(PKGCONFIG) --variable=$(3) $(2))
endef
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