doc: select_list: parse DEFS from the modules Makefiles

Get all the variable definitions from each module Makefile and
evaluate them to get proper DEFS and INCLUDES (using sed to
extract the variable definitions, conditionals and filter-out
rules from the Makefiles, some hack to preserve the LFs and
$(eval) to evaluate the extracted stuff in the current context).
The DEFS and INCLUDES will be passed to the documentation
generating script (dump_selects.pl) as extra arguments for gcc.
This way the proper defines and includes will be used for each
module.
Fixes select list generation failure for modules with non-standard
include dirs.

doc/select_list/Makefile

@@ -62,7 +62,23 @@ override force_grp=
 endif
 
 # command used for gcc (contains extra includes)
-gcc=gcc -I$(COREPATH)/lib -I/usr/include/libxml2
+gcc=gcc
+#-I$(COREPATH)/lib -I$(COREPATH) -I/usr/include/libxml2
+
+# defines used by gcc
+c_defs=-D__CPU_i386 -D__OS_linux -DSER_VER=2099099 -DPKG_MALLOC -DSHM_MEM  \
+		-DSHM_MMAP -DDNS_IP_HACK -DUSE_IPV6 -DUSE_MCAST -DUSE_TCP \
+		-DUSE_DNS_CACHE -DUSE_DNS_FAILOVER -DUSE_DST_BLACKLIST -DUSE_NAPTR \
+		-DUSE_TLS -DTLS_HOOKS -DFAST_LOCK   -DCC_GCC_LIKE_ASM \
+		-DHAVE_GETHOSTBYNAME2 -DHAVE_UNION_SEMUN -DHAVE_SCHED_YIELD \
+		-DHAVE_MSG_NOSIGNAL -DHAVE_MSGHDR_MSG_CONTROL -DHAVE_ALLOCA_H \
+		-DHAVE_SCHED_SETSCHEDULER -DHAVE_EPOLL -DUSE_SCTP -DNAME='\"ser\"' \
+		-DVERSION='\"2.99.99-pre3\"' -DARCH='\"i386\"' -DOS_QUOTED='\"linux\"'
+
+
+# common makefile vars used in defs
+LOCALBASE=/usr/local
+SYSBASE=/usr
 
 filter_files=$(subst .h:,.c:, $(filter-out $(addsuffix %,$(file_exclude)),\
 				$(filter-out $(addprefix %:,$(grp_exclude)),$(1))) )
@@ -95,23 +111,82 @@ get_grp=$(strip $(if $(grp_f_$(call get_bname,$(1))), \
 # get target from file:grp (get_target(file:grp) => select_grp)
 get_target=select_$(call get_grp,$(1))
 
+
+# $(LF) definition (do not remove)
+define LF
+
+
+endef
+
+# get all the lines containing DEFS or INCLUDES definitions from the Makefile.
+# WARNING: does not work with all sed implementation (tested with GNU sed).
+# It uses a hack to restore the LFs (LFs are removed by $(shell)): LFs are
+# replaced with '^LF^' and then ^LF^ is subst'ed back to a real LF.
+get_make_idefs=$(subst ^LF^,$(LF),$(shell sed \
+ -ne '/^[\t ]*\(DEFS\|INCLUDES\)[\t ]*[+:]\?=.*[^\]$$/H'\
+ -ne '/^[\t ]*\(DEFS\|INCLUDES\)[\t ]*[+:]\?=.*\\$$/,/\(^$$\)\|\([^\]$$\)/H'\
+ -ne '$${g;s/\n/^LF^/g;p}'\
+< $(1)/Makefile ))
+
+
+# get all the lines from the makefile containing variable definitions.
+# It will also return conditionals and try to filter out possible rules.
+# WARNING: does not work with all sed implementation (tested with GNU sed).
+# It uses a hack to restore the LFs (LFs are removed by $(shell)): LFs are
+# replaced with '^LF^' and then ^LF^ is subst'ed back to a real LF.
+get_make_vars=$(subst ^LF^,$(LF),$(shell sed -n \
+ -e ': start' \
+ -e '/^\(ifeq\|ifneq\|else\|endif\)[\t ]*\($$\|.*[^\]$$\)/{H;d}' \
+ -e '/^\(ifeq\|ifneq\|else\|endif\)[\t ]\+.*[\]$$/,/[^\]$$/{H;d}' \
+ -e '/^[a-zA-Z._/$$][a-zA-Z0-9._()/$$ \t-]*:\([^=]\|$$\)/b eat_rule' \
+ -e '/^[\t ]*[A-Za-z._][A-Za-z0-9._-]*[\t ]*[+:]\?=.*[^\]$$/{H;d}' \
+ -e '/^[\t ]*[A-Za-z._][A-Za-z0-9._-]*[\t ]*[+:]\?=.*\\$$/,/\(^$$\)\|\([^\]$$\)/{H;d}' \
+ -e ': end' \
+ -e '$${g;s/\n/^LF^/g;p}'\
+ -e 'b' \
+ -e ': eat_rule' \
+ -e '$$b end' \
+ -e 'n' \
+ -e '/^[a-zA-Z._/$$][a-zA-Z0-9._()/$$ \t-]*:\([^=]\|$$\)/b eat_rule' \
+ -e '/^[\t]/b eat_rule' \
+ -e 'b start' \
+< $(1)/Makefile ))
+
+
 define  mk_rules
 
 $(call check_fname_grp, $(1))
 
 #$$(info generating select_$$(call get_grp,$(1)).txt: $$(call get_prereq,$(1)))
 
+
+DEFS:=
+INCLUDES:=
+# extract all the includes and defs from the module makefile and
+# evaluate them
+$$(eval $$(call get_make_vars,$$(dir $$(call get_prereq,$(1)))))
+# override COREPATH (we know better)
+COREPATH=../..
+# save the result in a per group e_idefs_<grp_name> var
+$$(eval e_idefs_$$(call get_grp,$(1)):=$$(DEFS) $$(INCLUDES))
+
+# debugging:
+#$$(info eval: $$(call get_make_vars,$$(dir $$(call get_prereq,$(1)))))
+#$$(info e_idefs_$$(call get_grp,$(1))=$$(e_idefs_$$(call get_grp,$(1))))
+
 $(txt_output_dir)/$$(call get_target,$(1)).txt: \
 								$$(call get_prereq,$(1)) Makefile $(CFG2TXT)
 	$(CFG2TXT) --file $$< --$(force_grp)grp=$$(call get_grp,$(1)) \
-		--gcc="$(gcc)" --txt $(CFG2TXT_EXTRA_OPTS) > "$$@" || \
-		(rm -f "$$@"; exit 1)
+		--gcc="$(gcc)" --txt  $(CFG2TXT_EXTRA_OPTS) \
+		--defs="$(c_defs) $$(e_idefs_$$(call get_grp,$(1)))" \
+		> "$$@" || (rm -f "$$@"; exit 1)
 
 $(docbook_output_dir)/$$(call get_target,$(1)).xml: \
 								$$(call get_prereq,$(1)) Makefile $(CFG2TXT)
 	$(CFG2DOCBOOK) --file $$< --$(force_grp)grp=$$(call get_grp,$(1)) \
-		--gcc="$(gcc)" --docbook $(CFG2DOCBOOK_EXTRA_OPTS) > "$$@" || \
-		(rm -f "$$@"; exit 1)
+		--gcc="$(gcc)" --docbook $(CFG2DOCBOOK_EXTRA_OPTS) \
+		--defs="$(c_defs) $$(e_idefs_$$(call get_grp,$(1)))" \
+		> "$$@" || (rm -f "$$@"; exit 1)
 
 
 clean_$$(call get_target,$(1)).txt: