build/lua-detect.mk

   1 # Find highest known lua version.
   2 #
   3 # It uses pkg-config to do this, but will fail if you have liblua, but
   4 # not the corresponding interpreter/compiler. Let's say you have liblua5.2
   5 # but want to build with liblua5.1 (for which you have the lib, interpreter
   6 # and compiler), you can override by setting LUA_VERSION=5.0 when invoking
   7 # make.
   8 #
   9 # If successful, sets the following variables:
  10 #  * LUA_VERSION (unless already set)
  11 #  * LUA_LIBS (can be appended to LDFLAGS directly)
  12 #  * LUA_INCLUDES (can be appended to CFLAGS directly)
  13 #  * LUA (full path to lua interpreter)
  14 #  * LUAC (full path to lua compiler)
  15
  16 LUA_VERSION ?= $(shell pkg-config --exists lua5.2 && echo 5.2)
  17 LUA_VERSION ?= $(shell pkg-config --exists lua5.1 && echo 5.1)
  18 LUA_VERSION ?= $(shell pkg-config --exists lua    && echo 5.0)
  19
  20 ifeq ($(LUA_VERSION),)
  21     $(error Could not find any lua version. (Did you install the -dev package?))
  22 endif
  23
  24 # prior to 5.1 the lib didn't include version in name.
  25 ifeq ($(LUA_VERSION),5.0)
  26     LUA_VERSION=
  27 endif
  28
  29 LUA_LIBS = $(shell pkg-config --libs lua$(LUA_VERSION))
  30 LUA_INCLUDES = $(shell pkg-config --cflags lua$(LUA_VERSION))
  31 LUA = $(shell which lua$(LUA_VERSION))
  32 LUAC = $(shell which luac$(LUA_VERSION))
  33
  34 ifeq ($(LUA_LIBS),)
  35     $(error "pkg-config couldn't find linker flags for lua$(LUA_VERSION)!")
  36 endif
  37
  38 ifeq ($(LUA_INCLUDES),)
  39     $(error "pkg-config couldn't find compiler flags for lua$(LUA_VERSION)!")
  40 endif
  41
  42 ifeq ($(LUA),)
  43     $(error No lua$(LUA_VERSION) interpreter found!)
  44 endif
  45
  46 ifeq ($(LUAC),)
  47     $(error No lua$(LUA_VERSION) compiler found!)
  48 endif