BUILD: try to automatically detect the Lua library name
Depending on the distribution, the Lua library can have different names.
Some distributions will require -llua5.2, others -llua52, and other systems may
require -llua.
Now, the Makefile will try to guess the library name, in order of priority :
"lua5.2", "lua52", or "lua".
diff --git a/Makefile b/Makefile
index a48e9b3..06288c1 100644
--- a/Makefile
+++ b/Makefile
@@ -77,6 +77,8 @@
# SSL_INC : force the include path to libssl/libcrypto
# LUA_LIB : force the lib path to lua
# LUA_INC : force the include path to lua
+# LUA_LIB_NAME : force the lib name (or automatically evaluated, by order of
+# priority : lua5.2, lua52, lua).
# IGNOREGIT : ignore GIT commit versions if set.
# VERSION : force haproxy version reporting.
# SUBVERS : add a sub-version (eg: platform, model, ...).
@@ -561,8 +563,19 @@
endif
ifneq ($(USE_LUA),)
+check_lua_lib = $(shell echo "int main(){}" | $(CC) -o /dev/null -x c - $(2) -l$(1) 2>/dev/null && echo $(1))
+
OPTIONS_CFLAGS += -DUSE_LUA $(if $(LUA_INC),-I$(LUA_INC))
-OPTIONS_LDFLAGS += $(if $(LUA_LIB),-L$(LUA_LIB)) -llua -lm
+LUA_LD_FLAGS := $(if $(LUA_LIB),-L$(LUA_LIB))
+ifeq ($(LUA_LIB_NAME),)
+# Try to automatically detect the Lua library
+LUA_LIB_NAME := $(firstword $(foreach lib,lua5.2 lua52 lua,$(call check_lua_lib,$(lib),$(LUA_LD_FLAGS))))
+ifeq ($(LUA_LIB_NAME),)
+$(error unable to automatically detect the Lua library name, you can enforce its name with LUA_LIB_NAME=<name> (where <name> can be lua5.2, lua52, lua, ...))
+endif
+endif
+
+OPTIONS_LDFLAGS += $(LUA_LD_FLAGS) -l$(LUA_LIB_NAME) -lm
OPTIONS_OBJS += src/hlua.o
endif