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