build: -Wmissing-prototypes

ref #343

Though I don't see a strong benefit, it isn't too much of a burden, and
maybe avoids confusion in some cases.

9 files changed, 13 insertions, 1 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 213709cb8e..d3ea80c926 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -259,7 +259,8 @@ if(MSVC)
   add_definitions(-DWIN32)
 else()
   add_definitions(-Wall -Wextra -pedantic -Wno-unused-parameter
-    -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion)
+    -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion
+    -Wmissing-prototypes)
 
   check_c_compiler_flag(-Wimplicit-fallthrough HAS_WIMPLICIT_FALLTHROUGH_FLAG)
   if(HAS_WIMPLICIT_FALLTHROUGH_FLAG)
diff --git a/src/nvim/aucmd.c b/src/nvim/aucmd.c
index 9ad3414b79..3bb0fcec3b 100644
--- a/src/nvim/aucmd.c
+++ b/src/nvim/aucmd.c
@@ -6,6 +6,7 @@
 #include "nvim/vim.h"
 #include "nvim/main.h"
 #include "nvim/ui.h"
+#include "nvim/aucmd.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "aucmd.c.generated.h"
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index df02a5ba17..8ca764ba68 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -5958,6 +5958,10 @@ static int get_env_tv(char_u **arg, typval_T *rettv, int evaluate)
 #pragma function (floor)
 #endif
 
+// silence -Wmissing-prototypes for funcs.generated.h
+const VimLFuncDef *find_internal_func_gperf(register const char *str,
+                                            register size_t len);
+
 # include "funcs.generated.h"
 #endif
 
diff --git a/src/nvim/eval/decode.c b/src/nvim/eval/decode.c
index 4d75c7bda1..42999ddd62 100644
--- a/src/nvim/eval/decode.c
+++ b/src/nvim/eval/decode.c
@@ -7,6 +7,7 @@
 
 #include "nvim/eval/typval.h"
 #include "nvim/eval.h"
+#include "nvim/eval/decode.h"
 #include "nvim/eval/encode.h"
 #include "nvim/ascii.h"
 #include "nvim/macros.h"
diff --git a/src/nvim/generators/gen_api_dispatch.lua b/src/nvim/generators/gen_api_dispatch.lua
index bd9650e4d1..3703b76973 100644
--- a/src/nvim/generators/gen_api_dispatch.lua
+++ b/src/nvim/generators/gen_api_dispatch.lua
@@ -448,6 +448,7 @@ for _, fn in ipairs(functions) do
 end
 
 output:write(string.format([[
+void nlua_add_api_functions(lua_State *lstate);  // silence -Wmissing-prototypes
 void nlua_add_api_functions(lua_State *lstate)
   FUNC_ATTR_NONNULL_ALL
 {
diff --git a/src/nvim/main.c b/src/nvim/main.c
index 9c8711495c..5d67f53ec4 100644
--- a/src/nvim/main.c
+++ b/src/nvim/main.c
@@ -222,6 +222,7 @@ void early_init(void)
 }
 
 #ifdef MAKE_LIB
+int nvim_main(int argc, char **argv);  // silence -Wmissing-prototypes
 int nvim_main(int argc, char **argv)
 #elif defined(WIN32)
 int wmain(int argc, wchar_t **argv_w)  // multibyte args on Windows. #7060
diff --git a/src/nvim/os/dl.c b/src/nvim/os/dl.c
index 267cf5ae4b..bbd0424a82 100644
--- a/src/nvim/os/dl.c
+++ b/src/nvim/os/dl.c
@@ -7,6 +7,7 @@
 #include <stdint.h>
 #include <uv.h>
 
+#include "nvim/os/dl.h"
 #include "nvim/os/os.h"
 #include "nvim/memory.h"
 #include "nvim/message.h"
diff --git a/src/nvim/os/lang.c b/src/nvim/os/lang.c
index 108a9c6c39..fe2d7986bf 100644
--- a/src/nvim/os/lang.c
+++ b/src/nvim/os/lang.c
@@ -11,6 +11,7 @@
 #ifdef HAVE_LOCALE_H
 # include <locale.h>
 #endif
+#include "nvim/os/lang.h"
 #include "nvim/os/os.h"
 
 void lang_init(void)
diff --git a/test/functional/fixtures/tty-test.c b/test/functional/fixtures/tty-test.c
index 5f1f5cb91c..e2a78a594b 100644
--- a/test/functional/fixtures/tty-test.c
+++ b/test/functional/fixtures/tty-test.c
@@ -20,6 +20,7 @@
 uv_tty_t tty;
 uv_tty_t tty_out;
 
+bool owns_tty(void);  // silence -Wmissing-prototypes
 bool owns_tty(void)
 {
 #ifdef _WIN32