1 files changed, 160 insertions, 45 deletions

diff --git a/GNUmakefile b/GNUmakefile
index c58686c..1893378 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -9,6 +9,20 @@ GUARD_$(d) := 1
 
 all: # default target
 
+#
+# G N U  M A K E  F U N C T I O N S
+#
+KNOWN_APIS = 5.1 5.2 5.3
+
+# template for invoking luapath script
+LUAPATH := $(d)/mk/luapath
+LUAPATH_FN = $(shell env CC='$(subst ',\\',$(CC))' CPPFLAGS='$(subst ',\\',$(CPPFLAGS))' LDFLAGS='$(subst ',\\',$(LDFLAGS))' $(LUAPATH) -krxm3 -I '$(subst ',\\',$(DESTDIR)$(includedir))' -I/usr/include -I/usr/local/include -P '$(subst ',\\',$(DESTDIR)$(bindir))' -P '$(subst ',\\',$(bindir))' -L '$(subst ',\\',$(DESTDIR)$(libdir))' -L '$(subst ',\\',$(libdir))' -v$(1) $(2))
+
+# check whether luapath can locate Lua $(1) headers
+HAVE_API_FN = $(and $(filter $(1),$(call LUAPATH_FN,$(1),version)),$(1)$(info enabling Lua $(1)))
+
+# check whether $(1) in LUA_APIS or $(LUA$(1:.=)_CPPFLAGS) is non-empty
+WITH_API_FN = $$(and $$(or $$(filter $(1),$$(LUA_APIS)),$$(LUA$(subst .,,$(1))_CPPFLAGS)),$(1))
 
 #
 # E N V I R O N M E N T  C O N F I G U R A T I O N
@@ -30,47 +44,43 @@ lua53path ?= $(datadir)/lua/5.3
 AR ?= ar
 RANLIB ?= ranlib
 M4 ?= m4
+MV ?= mv
 RM ?= rm
 CP ?= cp
-LN ?= ln
-LN_S ?= $(LN) -s
 RMDIR ?= rmdir
 MKDIR ?= mkdir
 CHMOD ?= chmod
 INSTALL ?= install
 INSTALL_DATA ?= $(INSTALL) -m 644
+TOUCH ?= touch
+TEE ?= tee
+TEE_A ?= $(TEE) -a
+
+# see Lua Autodetection, below
 
 .PHONY: $(d)/config
 
+PRINT_$(d) = printf "%s = %s\n" '$(1)' '$(subst ',\\',$(2))' | $(TEE_A) '$(3)'
+
+LAZY_$(d) = \
+        prefix includedir libdir datadir bindir \
+        lua51cpath lua51path lua52cpath lua52path lua53cpath lua53path \
+        CC ALL_CPPFLAGS CPPFLAGS ALL_CFLAGS CFLAGS ALL_LDFLAGS LDFLAGS \
+        ALL_SOFLAGS SOFLAGS ALL_LIB LIBS \
+        $(foreach API,$(KNOWN_APIS),ALL_LUA$(subst .,,$(API))_CPPFLAGS) \
+        AR RANLIB M4 MV RM CP RMDIR MKDIR CHMOD INSTALL INSTALL_DATA TOUCH \
+        TEE TEE_A
+
+NONLAZY_$(d) = \
+        LUA_APIS \
+        $(foreach API,$(KNOWN_APIS),LUAC$(subst .,,$(API))) \
+        $(foreach API,$(KNOWN_APIS),$(and $(call WITH_API_FN,$(API)),LUA$(subst .,,$(API))_CPPFLAGS))
+
 $(d)/config:
-        printf 'prefix ?= $(value prefix)'"\n" >| $(@D)/.config
-        printf 'includedir ?= $(value includedir)'"\n" >> $(@D)/.config
-        printf 'libdir ?= $(value libdir)'"\n" >> $(@D)/.config
-        printf 'datadir ?= $(value datadir)'"\n" >> $(@D)/.config
-        printf 'bindir ?= $(value bindir)'"\n" >> $(@D)/.config
-        printf 'lua51cpath ?= $(value lua51cpath)'"\n" >> $(@D)/.config
-        printf 'lua51path ?= $(value lua51path)'"\n" >> $(@D)/.config
-        printf 'lua52cpath ?= $(value lua52cpath)'"\n" >> $(@D)/.config
-        printf 'lua52path ?= $(value lua52path)'"\n" >> $(@D)/.config
-        printf 'lua53cpath ?= $(value lua53cpath)'"\n" >> $(@D)/.config
-        printf 'lua53path ?= $(value lua53path)'"\n" >> $(@D)/.config
-        printf 'CC ?= $(CC)'"\n" >> $(@D)/.config
-        printf 'CPPFLAGS ?= $(value CPPFLAGS)'"\n" >> $(@D)/.config
-        printf 'CFLAGS ?= $(value CFLAGS)'"\n" >> $(@D)/.config
-        printf 'LDFLAGS ?= $(value LDFLAGS)'"\n" >> $(@D)/.config
-        printf 'SOFLAGS ?= $(value SOFLAGS)'"\n" >> $(@D)/.config
-        printf 'AR ?= $(value AR)'"\n" >> $(@D)/.config
-        printf 'RANLIB ?= $(value RANLIB)'"\n" >> $(@D)/.config
-        printf 'M4 ?= $(value M4)'"\n" >> $(@D)/.config
-        printf 'RM ?= $(value RM)'"\n" >> $(@D)/.config
-        printf 'CP ?= $(value CP)'"\n" >> $(@D)/.config
-        printf 'LN ?= $(value LN)'"\n" >> $(@D)/.config
-        printf 'LN_S ?= $(value LN_S)'"\n" >> $(@D)/.config
-        printf 'RMDIR ?= $(value RMDIR)'"\n" >> $(@D)/.config
-        printf 'MKDIR ?= $(value MKDIR)'"\n" >> $(@D)/.config
-        printf 'CHMOD ?= $(value CHMOD)'"\n" >> $(@D)/.config
-        printf 'INSTALL ?= $(value INSTALL)'"\n" >> $(@D)/.config
-        printf 'INSTALL_DATA ?= $(value INSTALL_DATA)'"\n" >> $(@D)/.config
+        $(TOUCH) $(@D)/.config.tmp
+        @$(foreach V,$(LAZY_$(@D)), $(call PRINT_$(@D),$(V),$(value $(V)),$(@D)/.config.tmp);)
+        @$(foreach V,$(NONLAZY_$(@D)), $(call PRINT_$(@D),$(V),$($(V)),$(@D)/.config.tmp);)
+        $(MV) $(@D)/.config.tmp $(@D)/.config
 
 # add local targets if building from inside project tree
 ifneq "$(filter $(abspath $(d)/..)/%, $(abspath $(firstword $(MAKEFILE_LIST))))" ""
@@ -81,7 +91,49 @@ endif
 
 
 #
-# S H A R E D  C O M P I L A T I O N  F L A G S
+# L U A  A U T O D E T E C T I O N
+#
+
+# set LUA_APIS if empty or "?"
+ifeq ($(or $(strip $(LUA_APIS)),?),?)
+override LUA_APIS := $(call HAVE_API_FN,5.1) $(call HAVE_API_FN,5.2) $(call HAVE_API_FN,5.3)
+endif
+
+define LUAXY_template
+
+# set luaXYcpath if empty or "?"
+ifeq ($$(or $$(strip $$(lua$(subst .,,$(1))cpath)),?),?)
+override lua$(subst .,,$(1))cpath := $$(or $$(call LUAPATH_FN,$(1),cdir),$$(libdir)/lua/$(1))
+endif
+
+# set luaXYpath if empty or "?"
+ifeq ($$(or $$(strip $$(lua$(subst .,,$(1))path)),?),?)
+override lua$(subst .,,$(1))path = $$(or $$(call LUAPATH_FN,$(1),ldir),$$(datadir)/lua/$(1))
+endif
+
+# set LUAXY_CPPFLAGS if undefined or "?" (NB: can be empty if path already in $(CPPFLAGS))
+ifeq ($$(and $$(findstring undefined,$$(origin LUA$(subst .,,$(1))_CPPFLAGS)),?),?)
+override LUA$(subst .,,$(1))_CPPFLAGS = $$(and $$(call WITH_API_FN,$(1)),$$(call LUAPATH_FN,$(1),cppflags))
+endif
+
+# set ALL_LUAXY_CPPFLAGS if empty or "?"
+ifeq ($$(or $$(strip $$(ALL_LUA$(subst .,,$(1))_CPPFLAGS)),?),?)
+override ALL_LUA$(subst .,,$(1))_CPPFLAGS = $$(LUA$(subst .,,$(1))_CPPFLAGS)
+endif
+
+# set LUAXYC if empty or "?"
+ifeq ($$(or $$(strip $$(LUAC$(subst .,,$(1)))),?),?)
+override LUAC$(subst .,,$(1)) = $$(or $$(call LUAPATH_FN,$(1),luac),true)
+endif
+
+endef # LUAXY_template
+
+$(eval $(call LUAXY_template,5.1))
+$(eval $(call LUAXY_template,5.2))
+$(eval $(call LUAXY_template,5.3))
+
+#
+# A U T O D E T E C T  C O M P I L A T I O N  F L A G S
 #
 cc-option ?= $(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null \
              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi;)
@@ -89,44 +141,107 @@ cc-option ?= $(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null \
 VENDOR_OS_$(d) := $(shell $(d)/mk/vendor.os)
 VENDOR_CC_$(d) := $(shell env CC="$(CC)" $(d)/mk/vendor.cc)
 
+#
+# ALL_CPPFLAGS
+#
+ifeq ($(origin ALL_CPPFLAGS), undefined)
+
 ifneq ($(VENDOR_OS_$(d)), OpenBSD)
-CPPFLAGS_$(d) += -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE
+ALL_CPPFLAGS += -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE
 endif
 
 ifeq ($(VENDOR_OS_$(d)), SunOS)
-CPPFLAGS_$(d) += -Usun -D_XPG4_2 -D__EXTENSIONS__
+ALL_CPPFLAGS += -Usun -D_XPG4_2 -D__EXTENSIONS__
 endif
 
+ALL_CPPFLAGS += $(CPPFLAGS)
+
+endif # ALL_CPPFLAGS
+
+#
+# ALL_CFLAGS
+#
+ifeq ($(origin ALL_CFLAGS), undefined)
+
 ifeq ($(VENDOR_CC_$(d)), gcc)
-CFLAGS_$(d) += -O2 -std=gnu99 -fPIC
-CFLAGS_$(d) += -g -Wall -Wextra $(call cc-option, -Wno-missing-field-initializers) $(call cc-option, -Wno-override-init) -Wno-unused
+ALL_CFLAGS += -O2 -std=gnu99 -fPIC
+ALL_CFLAGS += -g -Wall -Wextra $(call cc-option, -Wno-missing-field-initializers) $(call cc-option, -Wno-override-init) -Wno-unused
 endif
 
 ifeq ($(VENDOR_CC_$(d)), clang)
-CFLAGS_$(d) += -O2 -std=gnu99 -fPIC
-CFLAGS_$(d) += -g -Wall -Wextra -Wno-missing-field-initializers -Wno-initializer-overrides -Wno-unused
+ALL_CFLAGS += -O2 -std=gnu99 -fPIC
+ALL_CFLAGS += -g -Wall -Wextra -Wno-missing-field-initializers -Wno-initializer-overrides -Wno-unused -Wno-dollar-in-identifier-extension
 endif
 
 ifeq ($(VENDOR_CC_$(d)), sunpro)
-CFLAGS_$(d) += -xcode=pic13
-CFLAGS_$(d) += -g
+ALL_CFLAGS += -xcode=pic13
+ALL_CFLAGS += -g
 #
-# Solaris Studio has a brain-dead function call analyzer which counts
-# arguments before preprocessor expansion.
+# Solaris Studio supports anonymous unions just fine; but it complains
+# incessantly about them.
 #
-CFLAGS_$(d) += -erroff=E_ARGUEMENT_MISMATCH
+ALL_CFLAGS += -erroff=E_ANONYMOUS_UNION_DECL
 endif
 
 ifeq ($(VENDOR_OS_$(d)), Darwin)
-CFLAGS_$(d) += -Wno-deprecated-declarations
+ALL_CFLAGS += -Wno-deprecated-declarations
 endif
 
+ALL_CFLAGS += $(CFLAGS)
+
+endif # ALL_CFLAGS
+
+#
+# ALL_SOFLAGS
+#
+ifeq ($(origin ALL_SOFLAGS), undefined)
+
 ifeq ($(VENDOR_OS_$(d)), Darwin)
-SOFLAGS_$(d) += -bundle -undefined dynamic_lookup
+ALL_SOFLAGS += -bundle -undefined dynamic_lookup
 else
-SOFLAGS_$(d) += -shared
+ALL_SOFLAGS += -shared
+endif
+
+ALL_SOFLAGS += $(SOFLAGS)
+
+endif # ALL_SOFLAGS
+
+#
+# ALL_LDFLAGS
+#
+ifeq ($(origin ALL_LDFLAGS), undefined)
+
+ALL_LDFLAGS += -L$(DESTDIR)$(libdir) -L$(libdir)
+ALL_LDFLAGS += $(LDFLAGS)
+
+endif # ALL_LDFLAGS
+
+#
+# ALL_LIBS
+#
+ifeq ($(origin ALL_LIBS), undefined)
+
+# put $(LIBS) first as they're more likely to be higher-level dependencies
+ALL_LIBS += $(LIBS)
+ALL_LIBS += -lssl -lcrypto -lpthread
+
+# NetBSD, FreeBSD, OpenBSD (and presumably descendants) lack any libdl;
+# dlopen, et al are part of libc.
+ifneq ($(patsubst %BSD,BSD,$(VENDOR_OS_$(d))), BSD)
+ALL_LIBS += -ldl
 endif
 
+# This only seems to be necessary on Linux. Darwin and OpenBSD lack a librt.
+# On OpenBSD clock_gettime is part of libc. Others have librt, but linking
+# it in is unnecessary.
+ifeq ($(VENDOR_OS_$(d)), Linux)
+ALL_LIBS += -lrt
+endif
+
+ALL_LIBS += -lm
+
+endif # ALL_LIBS
+
 
 #
 # P R O J E C T  R U L E S