build: enable IWYU on mac

src/nvim/CMakeLists.txt

@@ -259,6 +259,7 @@ if(ENABLE_IWYU)
 
   set(iwyu_flags "${IWYU_PRG};")
   string(APPEND iwyu_flags "-Xiwyu;--no_default_mappings;")
+  string(APPEND iwyu_flags "-Xiwyu;--no_fwd_decls;")
   string(APPEND iwyu_flags "-Xiwyu;--mapping_file=${PROJECT_SOURCE_DIR}/cmake.config/iwyu/mapping.imp")
 
   set_target_properties(nvim PROPERTIES C_INCLUDE_WHAT_YOU_USE "${iwyu_flags}")

src/nvim/base64.c

@@ -3,7 +3,7 @@
 #include <stdint.h>
 #include <string.h>
 
-#include "auto/config.h"
+#include "auto/config.h"  // IWYU pragma: keep
 #include "nvim/base64.h"
 #include "nvim/memory.h"
 

src/nvim/buffer_defs.h

@@ -4,7 +4,7 @@
 #include <stdint.h>
 #include <stdio.h>
 
-typedef struct file_buffer buf_T;  // Forward declaration
+typedef struct file_buffer buf_T;
 
 /// Reference to a buffer that stores the value of buf_free_count.
 /// bufref_valid() only needs to check "buf" when the count differs.

src/nvim/cmdexpand.c

@@ -6,6 +6,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "nvim/api/private/defs.h"
 #include "nvim/api/private/helpers.h"

src/nvim/edit.c

@@ -9,6 +9,7 @@
 
 #include "nvim/ascii.h"
 #include "nvim/autocmd.h"
+#include "nvim/autocmd_defs.h"
 #include "nvim/buffer.h"
 #include "nvim/change.h"
 #include "nvim/charset.h"

src/nvim/eval.c

@@ -7,6 +7,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 
 #include "auto/config.h"
 #include "nvim/api/private/converter.h"

src/nvim/eval/typval.c

@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "nvim/ascii.h"
 #include "nvim/assert.h"

src/nvim/event/rstream.c

@@ -2,7 +2,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
+#include <sys/types.h>
 #include <uv.h>
 
 #include "nvim/event/loop.h"

src/nvim/ex_docmd.c

@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "auto/config.h"
 #include "nvim/arglist.h"

src/nvim/fileio.c

@@ -11,6 +11,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #include <time.h>
 #include <uv.h>
 

src/nvim/keycodes.c

@@ -4,6 +4,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "nvim/ascii.h"
 #include "nvim/charset.h"

src/nvim/lua/stdlib.c

@@ -5,8 +5,8 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
 #include <string.h>
+#include <sys/types.h>
 
 #ifdef NVIM_VENDOR_BIT
 # include "bit.h"

src/nvim/main.c

@@ -21,6 +21,11 @@
 #include "nvim/vim.h"
 // uncrustify:on
 
+#include "auto/config.h"  // IWYU pragma: keep
+#include "nvim/api/extmark.h"
+#include "nvim/api/private/defs.h"
+#include "nvim/api/private/helpers.h"
+#include "nvim/api/ui.h"
 #include "nvim/arglist.h"
 #include "nvim/ascii.h"
 #include "nvim/autocmd.h"
@@ -34,7 +39,9 @@
 #include "nvim/eval.h"
 #include "nvim/eval/typval.h"
 #include "nvim/eval/userfunc.h"
+#include "nvim/event/loop.h"
 #include "nvim/event/multiqueue.h"
+#include "nvim/event/process.h"
 #include "nvim/event/stream.h"
 #include "nvim/ex_cmds.h"
 #include "nvim/ex_docmd.h"
@@ -61,6 +68,9 @@
 #include "nvim/message.h"
 #include "nvim/mouse.h"
 #include "nvim/move.h"
+#include "nvim/msgpack_rpc/channel.h"
+#include "nvim/msgpack_rpc/helpers.h"
+#include "nvim/msgpack_rpc/server.h"
 #include "nvim/normal.h"
 #include "nvim/ops.h"
 #include "nvim/option.h"
@@ -71,6 +81,7 @@
 #include "nvim/os/input.h"
 #include "nvim/os/lang.h"
 #include "nvim/os/os.h"
+#include "nvim/os/signal.h"
 #include "nvim/os/stdpaths_defs.h"
 #include "nvim/path.h"
 #include "nvim/popupmenu.h"
@@ -91,16 +102,6 @@
 #ifdef MSWIN
 # include "nvim/os/os_win_console.h"
 #endif
-#include "nvim/api/extmark.h"
-#include "nvim/api/private/defs.h"
-#include "nvim/api/private/helpers.h"
-#include "nvim/api/ui.h"
-#include "nvim/event/loop.h"
-#include "nvim/event/process.h"
-#include "nvim/msgpack_rpc/channel.h"
-#include "nvim/msgpack_rpc/helpers.h"
-#include "nvim/msgpack_rpc/server.h"
-#include "nvim/os/signal.h"
 
 // values for "window_layout"
 enum {

src/nvim/marktree.c

@@ -47,6 +47,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "klib/kvec.h"
 #include "nvim/garray.h"

src/nvim/mbyte.c

@@ -32,6 +32,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 #include <wctype.h>
 
 #include "auto/config.h"

src/nvim/memline.c

@@ -39,6 +39,7 @@
 #include <stddef.h>
 #include <stdio.h>
 #include <string.h>
+#include <sys/types.h>
 #include <time.h>
 #include <uv.h>
 

src/nvim/message.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "nvim/api/private/helpers.h"
 #include "nvim/ascii.h"

src/nvim/ops.c

@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "nvim/api/private/defs.h"
 #include "nvim/ascii.h"

src/nvim/os/fileio.c

@@ -28,6 +28,10 @@
 # include "nvim/os/os_win_console.h"
 #endif
 
+#ifdef HAVE_SYS_UIO_H
+# include <sys/uio.h>
+#endif
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "os/fileio.c.generated.h"
 #endif

src/nvim/os/fs.c

@@ -67,8 +67,6 @@ static const char e_xattr_other[]
   = N_("E1509: Error occurred when reading or writing extended attribute");
 #endif
 
-struct iovec;
-
 #define RUN_UV_FS_FUNC(ret, func, ...) \
   do { \
     uv_fs_t req; \

src/nvim/os/process.c

@@ -3,18 +3,19 @@
 /// psutil is a good reference for cross-platform syscall voodoo:
 /// https://github.com/giampaolo/psutil/tree/master/psutil/arch
 
+// IWYU pragma: no_include <sys/param.h>
+
 #include <assert.h>
 #include <signal.h>
 #include <stdbool.h>
 #include <stddef.h>
-#include <stdio.h>
 #include <uv.h>
 
 #ifdef MSWIN
 # include <tlhelp32.h>
 #endif
 
-#if defined(__FreeBSD__)  // XXX: OpenBSD ?
+#if defined(__FreeBSD__)
 # include <string.h>
 # include <sys/types.h>
 # include <sys/user.h>
@@ -25,8 +26,13 @@
 #endif
 
 #if defined(__APPLE__) || defined(BSD)
-# include <pwd.h>
 # include <sys/sysctl.h>
+
+# include "nvim/macros.h"
+#endif
+
+#if defined(__linux__)
+# include <stdio.h>
 #endif
 
 #include "nvim/log.h"

src/nvim/os/signal.c

@@ -1,6 +1,7 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <stdio.h>
+
 #ifndef MSWIN
 # include <signal.h>
 #endif
@@ -11,9 +12,12 @@
 #include "nvim/globals.h"
 #include "nvim/log.h"
 #include "nvim/main.h"
-#include "nvim/memline.h"
 #include "nvim/os/signal.h"
 
+#ifdef SIGPWR
+# include "nvim/memline.h"
+#endif
+
 static SignalWatcher spipe, shup, squit, sterm, susr1, swinch;
 #ifdef SIGPWR
 static SignalWatcher spwr;

src/nvim/os/time.c

@@ -17,8 +17,6 @@
 #include "nvim/os/os.h"
 #include "nvim/os/time.h"
 
-struct tm;
-
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "os/time.c.generated.h"  // IWYU pragma: export
 #endif

src/nvim/os/unix_defs.h

@@ -1,15 +1,18 @@
 #pragma once
 // IWYU pragma: private, include "nvim/os/os_defs.h"
 
-#include <sys/param.h>  // IWYU pragma: export
-#include <sys/socket.h>  // IWYU pragma: export
-#include <unistd.h>  // IWYU pragma: export
+// IWYU pragma: begin_exports
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <unistd.h>
 #if defined(HAVE_TERMIOS_H)
-# include <termios.h>  // IWYU pragma: export
+# include <termios.h>
 #endif
-
-// POSIX.1-2008 says that NAME_MAX should be in here
-#include <limits.h>
+// IWYU pragma: end_exports
 
 #define TEMP_DIR_NAMES { "$TMPDIR", "/tmp", ".", "~" }
 #define TEMP_FILE_PATH_MAXLEN 256

src/nvim/ui_compositor.c

@@ -7,9 +7,9 @@
 #include <inttypes.h>
 #include <limits.h>
 #include <stdbool.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "klib/kvec.h"
 #include "nvim/api/private/defs.h"

src/nvim/undo.c

@@ -77,6 +77,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 #include <time.h>
 #include <uv.h>