lua-detect.mk

# 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_SUFFIX=5.1 when invoking
# make.
#
# If successful, sets the following variables:
#  * LUA_SUFFIX (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_SUFFIX ?= $(shell \
       for ver in 5.2 5.1 ""; do\
           pkg-config --exists lua$$ver && echo "$$ver" && exit;\
       done)

LUA_VERSION := $(LUA_SUFFIX)
LUA_PCNAME := lua$(LUA_VERSION)

LUA_LIBS     := $(shell pkg-config --libs $(LUA_PCNAME) 2>/dev/null)
LUA_INCLUDES := $(shell pkg-config --cflags $(LUA_PCNAME) 2>/dev/null)
LUA          := $(or $(shell which lua$(LUA_SUFFIX)),  $(error No lua$(LUA_SUFFIX) interpreter found!))
LUAC         := $(or $(shell which luac$(LUA_SUFFIX)), $(error No lua$(LUA_SUFFIX) compiler found!))