Add automatic generation of headers

- The 'stripdecls.py' script replaces declarations in all headers by includes to
  generated headers.
  `ag '#\s*if(?!ndef NEOVIM_).*((?!#\s*endif).*\n)*#ifdef INCLUDE_GENERATED'`
  was used for this.
- Add and integrate gendeclarations.lua into the build system to generate the
  required includes.
- Add -Wno-unused-function
- Made a bunch of old-style definitions ANSI

This adds a requirement: all type and structure definitions must be present
before INCLUDE_GENERATED_DECLARATIONS-protected include.

Warning: mch_expandpath (path.h.generated.h) was moved manually. So far it is
the only exception.

1 files changed, 4 insertions, 13 deletions

diff --git a/src/nvim/if_cscope.h b/src/nvim/if_cscope.h
index 32824a7e3d..351d9caef6 100644
--- a/src/nvim/if_cscope.h
+++ b/src/nvim/if_cscope.h
@@ -1,16 +1,7 @@
 #ifndef NVIM_IF_CSCOPE_H
 #define NVIM_IF_CSCOPE_H
-/* if_cscope.c */
-char_u *get_cscope_name(expand_T *xp, int idx);
-void set_context_in_cscope_cmd(expand_T *xp, char_u *arg,
-                               cmdidx_T cmdidx);
-void do_cscope(exarg_T *eap);
-void do_scscope(exarg_T *eap);
-void do_cstag(exarg_T *eap);
-int cs_fgets(char_u *buf, int size);
-void cs_free_tags(void);
-void cs_print_tags(void);
-int cs_connection(int num, char_u *dbpath, char_u *ppath);
-void cs_end(void);
 
-#endif /* NVIM_IF_CSCOPE_H */
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "if_cscope.h.generated.h"
+#endif
+#endif  // NVIM_IF_CSCOPE_H