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# Find highest known lua version.
#
# It uses pkg-config to do this, but will fail if you have liblua, but
# not the corresponding interpreter/compiler. Let's say you have liblua5.2
# but want to build with liblua5.1 (for which you have the lib, interpreter
# and compiler), you can override by setting LUA_VERSION=5.0 when invoking
# make.
#
# If successful, sets the following variables:
# * LUA_VERSION (unless already set)
# * LUA_LIBS (can be appended to LDFLAGS directly)
# * LUA_INCLUDES (can be appended to CFLAGS directly)
# * LUA (full path to lua interpreter)
# * LUAC (full path to lua compiler)
LUA_VERSIONS_CANDIDATES = $(or $(LUA_VERSION),5.2 5.1 5.0)
LUA_PKG := $(firstword $(foreach ver,$(LUA_VERSIONS_CANDIDATES),$(shell \
($(PKG_CONFIG) --exists lua-$(ver) && echo lua-$(ver)) \
|| ($(PKG_CONFIG) --exists lua$(ver:5.0=) && echo lua$(ver:5.0=)))))
ifeq ($(LUA_PKG),)
$(error Could not find $(or $(LUA_VERSION),any) lua version. (Did you install the -dev package?))
endif
LUA_VERSION ?= $(or $(shell $(PKG_CONFIG) --variable=V $(LUA_PKG)),5.0)
# prior to 5.1 the lib didn't include version in name.
LUA_SUFFIX := $(if $(findstring $(LUA_VERSION),5.0),,$(LUA_VERSION))
LUA_LIBS := $(or $(shell $(PKG_CONFIG) --libs $(LUA_PKG)), $(error "pkg-config couldn't find linker flags for lua$(LUA_SUFFIX)!"))
LUA_INCLUDES := $(shell $(PKG_CONFIG) --cflags $(LUA_PKG))
LUA := $(or $(shell which lua$(LUA_SUFFIX)), $(shell which lua), $(error No lua$(LUA_SUFFIX) interpreter found!))
LUAC := $(or $(shell which luac$(LUA_SUFFIX)), $(shell which luac), $(error No lua$(LUA_SUFFIX) compiler found!))
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