Convert non-mandatory attributes to macros

They're shorter and more portable.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/c2.c

@@ -344,7 +344,7 @@ c2_dump_raw(c2_ptr_t p);
 /**
  * Wrapper of c2_dump_raw().
  */
-static inline void __attribute__((unused))
+static inline void attr_unused
 c2_dump(c2_ptr_t p) {
   c2_dump_raw(p);
   printf("\n");

src/common.h

@@ -1524,7 +1524,7 @@ xr_sync(session_t *ps, Drawable d, XSyncFence *pfence) {
     if (!*pfence)
       *pfence = XSyncCreateFence(ps->dpy, d, False);
     if (*pfence) {
-      Bool __attribute__((unused)) triggered = False;
+      Bool attr_unused triggered = False;
       /* if (XSyncQueryFence(ps->dpy, *pfence, &triggered) && triggered)
         XSyncResetFence(ps->dpy, *pfence); */
       // The fence may fail to be created (e.g. because of died drawable)

src/compton.c

@@ -1271,7 +1271,7 @@ root_damaged(session_t *ps) {
  * Xlib error handler function.
  */
 static int
-xerror(Display __attribute__((unused)) *dpy, XErrorEvent *ev) {
+xerror(Display attr_unused *dpy, XErrorEvent *ev) {
   if (!should_ignore(ps_g, ev->serial))
     x_print_error(ev->serial, ev->request_code, ev->minor_code, ev->error_code);
   return 0;
@@ -1281,7 +1281,7 @@ xerror(Display __attribute__((unused)) *dpy, XErrorEvent *ev) {
  * XCB error handler function.
  */
 void
-ev_xcb_error(session_t __attribute__((unused)) *ps, xcb_generic_error_t *err) {
+ev_xcb_error(session_t attr_unused *ps, xcb_generic_error_t *err) {
   if (!should_ignore(ps, err->sequence))
     x_print_error(err->sequence, err->major_code, err->minor_code, err->error_code);
 }
@@ -1395,12 +1395,12 @@ opts_set_no_fading_openclose(session_t *ps, bool newval) {
 //!@}
 #endif
 
-static inline int __attribute__((unused))
+static inline int attr_unused
 ev_serial(xcb_generic_event_t *ev) {
   return ev->full_sequence;
 }
 
-static inline const char * __attribute__((unused))
+static inline const char * attr_unused
 ev_name(session_t *ps, xcb_generic_event_t *ev) {
   static char buf[128];
   switch (ev->response_type & 0x7f) {
@@ -1437,7 +1437,7 @@ ev_name(session_t *ps, xcb_generic_event_t *ev) {
   return buf;
 }
 
-static inline Window __attribute__((unused))
+static inline Window attr_unused
 ev_window(session_t *ps, xcb_generic_event_t *ev) {
   switch (ev->response_type) {
     case FocusIn:
@@ -1504,7 +1504,7 @@ ev_focus_detail_name(xcb_focus_in_event_t* ev) {
   return "Unknown";
 }
 
-static inline void __attribute__((unused))
+static inline void attr_unused
 ev_focus_report(xcb_focus_in_event_t *ev) {
   printf("  { mode: %s, detail: %s }\n", ev_focus_mode_name(ev),
       ev_focus_detail_name(ev));
@@ -1850,7 +1850,7 @@ ev_shape_notify(session_t *ps, xcb_shape_notify_event_t *ev) {
  */
 static void
 ev_screen_change_notify(session_t *ps,
-    xcb_randr_screen_change_notify_event_t __attribute__((unused)) *ev) {
+    xcb_randr_screen_change_notify_event_t attr_unused *ev) {
   if (ps->o.xinerama_shadow_crop)
     cxinerama_upd_scrs(ps);
 
@@ -1865,7 +1865,7 @@ ev_screen_change_notify(session_t *ps,
 
 inline static void
 ev_selection_clear(session_t *ps,
-    xcb_selection_clear_event_t __attribute__((unused)) *ev) {
+    xcb_selection_clear_event_t attr_unused *ev) {
   // The only selection we own is the _NET_WM_CM_Sn selection.
   // If we lose that one, we should exit.
   fprintf(stderr, "Another composite manager started and "
@@ -1876,7 +1876,7 @@ ev_selection_clear(session_t *ps,
 /**
  * Get a window's name from window ID.
  */
-static inline void __attribute__((unused))
+static inline void attr_unused
 ev_window_name(session_t *ps, Window wid, char **name) {
   *name = "";
   if (wid) {
@@ -4090,7 +4090,7 @@ session_run(session_t *ps) {
 }
 
 static void
-sigint_handler(int __attribute__((unused)) signum) {
+sigint_handler(int attr_unused signum) {
   exit(0);
 }
 

src/compton.h

@@ -59,7 +59,7 @@ void map_win(session_t *ps, Window id);
  *
  * Truncate to 0 if the result is negative.
  */
-static inline unsigned long __attribute__((const))
+static inline unsigned long attr_const
 sub_unslong(unsigned long a, unsigned long b) {
   return (a > b) ? a - b : 0;
 }

src/kernel.c

@@ -3,8 +3,8 @@
 
 #include <math.h>
 
-#include "utils.h"
 #include "kernel.h"
+#include "utils.h"
 
 /*
  * A picture will help
@@ -23,11 +23,11 @@
  *  center  +-----+-------------------+-----+
  */
 
-double
-sum_kernel(conv *map, int x, int y, int width, int height) {
+double attr_const attr_pure sum_kernel(const conv *map, int x, int y, int width,
+                                       int height) {
 	int fx, fy;
-	double *g_data;
-	double *g_line = map->data;
+	const double *g_data;
+	const double *g_line = map->data;
 	int g_size = map->size;
 	int center = g_size / 2;
 	int fx_start, fx_end;
@@ -77,7 +77,7 @@ sum_kernel(conv *map, int x, int y, int width, int height) {
 	return v;
 }
 
-static double __attribute__((const)) gaussian(double r, double x, double y) {
+static double attr_const attr_pure gaussian(double r, double x, double y) {
 	// Formula can be found here:
 	// https://en.wikipedia.org/wiki/Gaussian_blur#Mathematics
 	// Except a special case for r == 0 to produce sharp shadows

src/kernel.h

@@ -2,18 +2,19 @@
 // Copyright (c) Yuxuan Shui <yshuiv7@gmail.com>
 
 #pragma once
+#include "compiler.h"
 
 /// Code for generating convolution kernels
 
 typedef struct conv {
-  int size;
-  double data[];
+	int size;
+	double data[];
 } conv;
 
 /// Calculate the sum of a rectangle part of the convolution kernel
 /// the rectangle is defined by top left (x, y), and a size (width x height)
-double
-sum_kernel(conv *map, int x, int y, int width, int height);
+double attr_const attr_pure sum_kernel(const conv *map, int x, int y, int width,
+                                       int height);
 
 /// Create a kernel with gaussian distribution of radius r
 conv *gaussian_kernel(double r);

src/opengl.h

@@ -166,7 +166,7 @@ void
 glx_release_pixmap(session_t *ps, glx_texture_t *ptex);
 
 void glx_paint_pre(session_t *ps, region_t *preg)
-__attribute__((nonnull(1, 2)));
+attr_nonnull(1, 2);
 
 /**
  * Check if a texture is binded, or is binded to the given pixmap.

src/render.c

@@ -51,7 +51,7 @@ static inline void xrfilter_reset(session_t *ps, xcb_render_picture_t p) {
 #undef FILTER
 }
 
-static inline void __attribute__((nonnull(1, 2)))
+static inline void attr_nonnull(1, 2)
 set_tgt_clip(session_t *ps, region_t *reg) {
 	switch (ps->o.backend) {
 	case BKEND_XRENDER:

src/utils.h

@@ -36,7 +36,7 @@ static inline bool safe_isnan(double a) {
  * @param max maximum value
  * @return normalized value
  */
-static inline int __attribute__((const))
+static inline int attr_const
 normalize_i_range(int i, int min, int max) {
   if (i > max) return max;
   if (i < min) return min;
@@ -46,7 +46,7 @@ normalize_i_range(int i, int min, int max) {
 /**
  * Select the larger integer of two.
  */
-static inline int __attribute__((const))
+static inline int attr_const
 max_i(int a, int b) {
   return (a > b ? a : b);
 }
@@ -54,7 +54,7 @@ max_i(int a, int b) {
 /**
  * Select the smaller integer of two.
  */
-static inline int __attribute__((const))
+static inline int attr_const
 min_i(int a, int b) {
   return (a > b ? b : a);
 }
@@ -62,7 +62,7 @@ min_i(int a, int b) {
 /**
  * Select the larger long integer of two.
  */
-static inline long __attribute__((const))
+static inline long attr_const
 max_l(long a, long b) {
   return (a > b ? a : b);
 }
@@ -70,7 +70,7 @@ max_l(long a, long b) {
 /**
  * Select the smaller long integer of two.
  */
-static inline long __attribute__((const))
+static inline long attr_const
 min_l(long a, long b) {
   return (a > b ? b : a);
 }
@@ -83,7 +83,7 @@ min_l(long a, long b) {
  * @param max maximum value
  * @return normalized value
  */
-static inline double __attribute__((const))
+static inline double attr_const
 normalize_d_range(double d, double min, double max) {
   if (d > max) return max;
   if (d < min) return min;
@@ -96,7 +96,7 @@ normalize_d_range(double d, double min, double max) {
  * @param d double value to normalize
  * @return normalized value
  */
-static inline double __attribute__((const))
+static inline double attr_const
 normalize_d(double d) {
   return normalize_d_range(d, 0.0, 1.0);
 }

src/win.h

@@ -379,7 +379,7 @@ win_get_bounding_shape_global_by_val(win *w) {
  * Calculate the extents of the frame of the given window based on EWMH
  * _NET_FRAME_EXTENTS and the X window border width.
  */
-static inline margin_t __attribute__((pure))
+static inline margin_t attr_pure
 win_calc_frame_extents(const win *w) {
   margin_t result = w->frame_extents;
   result.top = max_i(result.top, w->g.border_width);
@@ -392,7 +392,7 @@ win_calc_frame_extents(const win *w) {
 /**
  * Check whether a window has WM frames.
  */
-static inline bool __attribute__((pure))
+static inline bool attr_pure
 win_has_frame(const win *w) {
   return w->g.border_width
     || w->frame_extents.top || w->frame_extents.left

src/x.h

@@ -98,19 +98,19 @@ xcb_render_picture_t x_create_picture_with_pictfmt_and_pixmap(
   session_t *ps, xcb_render_pictforminfo_t *pictfmt,
   xcb_pixmap_t pixmap, unsigned long valuemask,
   const xcb_render_create_picture_value_list_t *attr)
-__attribute__((nonnull(1, 2)));
+attr_nonnull(1, 2);
 
 xcb_render_picture_t x_create_picture_with_visual_and_pixmap(
   session_t *ps, xcb_visualid_t visual,
   xcb_pixmap_t pixmap, unsigned long valuemask,
   const xcb_render_create_picture_value_list_t *attr)
-__attribute__((nonnull(1)));
+attr_nonnull(1);
 
 xcb_render_picture_t x_create_picture_with_standard_and_pixmap(
   session_t *ps, xcb_pict_standard_t standard,
   xcb_pixmap_t pixmap, unsigned long valuemask,
   const xcb_render_create_picture_value_list_t *attr)
-__attribute__((nonnull(1)));
+attr_nonnull(1);
 
 /**
  * Create an picture.