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 := $(or $(LUA_VERSION), $(shell \
  17        (pkg-config --exists lua5.2 && echo 5.2) \
  18     || (pkg-config --exists lua5.1 && echo 5.1) \
  19     || (pkg-config --exists lua    && echo 5.0)))
  20
  21 ifeq ($(LUA_VERSION),)
  22     $(error Could not find any lua version. (Did you install the -dev package?))
  23 endif
  24
  25 # prior to 5.1 the lib didn't include version in name.
  26 ifeq ($(LUA_VERSION),5.0)
  27     LUA_VERSION=
  28 endif
  29
  30 LUA_LIBS     := $(or $(shell pkg-config --libs lua$(LUA_VERSION)),   $(error "pkg-config couldn't find linker flags for lua$(LUA_VERSION)!"))
  31 LUA_INCLUDES := $(shell pkg-config --cflags lua$(LUA_VERSION))
  32 LUA          := $(or $(shell which lua$(LUA_VERSION)),               $(error No lua$(LUA_VERSION) interpreter found!))
  33 LUAC         := $(or $(shell which luac$(LUA_VERSION)),              $(error No lua$(LUA_VERSION) compiler found!))