doc: cfg_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_cfg_defs.pl) as extra arguments for gcc. This
way the proper defines and includes will be used for each module.
Fixes cfg var. list generation failure for modules with kamailio module
interface or with non-standard include dirs.

doc/cfg_list/Makefile

@@ -53,7 +53,23 @@ 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=$(filter-out $(addsuffix %,$(file_exclude)),\
 				$(filter-out $(addprefix %:,$(grp_exclude)),$(1)))
@@ -86,21 +102,80 @@ get_grp=$(strip $(if $(grp_f_$(call get_bname,$(1))), \
 # get target from file:grp (get_target(file:grp) => cfg_grp.txt)
 get_target=cfg_$(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))
 
 #$$(info generating cfg_$$(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)))))
+# 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 > "$$@" ||  (rm -f "$$@"; exit 1)
+		--gcc="$(gcc)" --txt \
+		--defs="$(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 > "$$@" ||  (rm -f "$$@"; exit 1)
+		--gcc="$(gcc)" --docbook \
+		--defs="$(c_defs) $$(e_idefs_$$(call get_grp,$(1)))" \
+		> "$$@" || (rm -f "$$@"; exit 1)
 
 
 clean_$$(call get_target,$(1)).txt: