libnftables: Split code into frontend and library

This finally creates the libnftables shared object.

For some reason, this causes two compiler warnings to appear:

| parser_bison.y: In function 'nft_parse':
| parser_bison.y:131:3: warning: implicit declaration of function 'nft_set_debug' [-Wimplicit-function-declaration]
|    nft_set_debug(1, scanner);
|    ^~~~~~~~~~~~~
| parser_bison.c:64:25: warning: implicit declaration of function 'nft_lex' [-Wimplicit-function-declaration]
|  #define yylex           nft_lex
|                          ^
| parser_bison.c:4745:16: note: in expansion of macro 'yylex'
|        yychar = yylex (&yylval, &yylloc, scanner);

So this patch contains a workaround, namely declaring both functions
in src/parser_bison.y. During linking the objects are found, so this is
rather a matter of cosmetics.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/libnftables.pc.in b/libnftables.pc.in
new file mode 100644
index 00000000..6431d48c
--- /dev/null
+++ b/libnftables.pc.in
@@ -0,0 +1,15 @@
+# libnftables pkg-config file
+
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libnftables
+Description: Netfilter nf_tables user library
+URL: http://netfilter.org/projects/nftables/
+Version: @VERSION@
+Requires:
+Conflicts:
+Libs: -L${libdir} -lnftables
+Cflags: -I${includedir}