Define _POSIX_C_SOURCE globally

Stop trying to maintain a per-file _POSIX_C_SOURCE. Instead,
require POSIX.1-2008 globally. A lot of core source files depend
on that already.

Some care must be taken on a few select files where we need a bit
more than POSIX. Some files need XSI extensions (_XOPEN_SOURCE) and
some files need BSD extensions (_DEFAULT_SOURCE). In both cases,
these feature test macros imply _POSIX_C_SOURCE. Make sure to not
define both these macros and _POSIX_C_SOURCE explicitly to avoid
POSIX requirement conflicts (e.g. _POSIX_C_SOURCE says POSIX.1-2001
but _XOPEN_SOURCE says POSIX.1-2008).

Additionally, there is one special case in render/vulkan/vulkan.c.
That file needs major()/minor(), and these are system-specific.
On FreeBSD, _POSIX_C_SOURCE hides system-specific symbols so we need
to make sure it's not defined for this file. On Linux, we can
explicitly include <sys/sysmacros.h> and ensure that apart from
symbols defined there the file only uses POSIX toys.

backend/backend.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <errno.h>
 #include <stdlib.h>

backend/drm/atomic.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <drm_fourcc.h>
 #include <stdlib.h>
 #include <stdio.h>

backend/drm/drm.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <drm_mode.h>

backend/drm/libliftoff.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <fcntl.h>
 #include <libliftoff.h>
 #include <sys/stat.h>

backend/drm/properties.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdbool.h>
 #include <stddef.h>

backend/drm/util.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <drm_mode.h>

backend/libinput/events.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <libinput.h>
 #include <stdlib.h>

backend/libinput/tablet_pad.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <string.h>
 #include <libinput.h>

backend/libinput/tablet_tool.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <string.h>
 #include <assert.h>
 #include <libinput.h>

backend/multi/backend.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <stdbool.h>
 #include <stdlib.h>

backend/session/session.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <libudev.h>
 #include <stdarg.h>

backend/wayland/backend.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <limits.h>

backend/wayland/output.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdint.h>
 #include <stdio.h>

backend/wayland/pointer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <stdlib.h>

backend/wayland/seat.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <stdint.h>

backend/wayland/tablet_v2.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <math.h>

backend/x11/backend.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <limits.h>

backend/x11/output.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <stdlib.h>

examples/cairo-buffer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 
 #include <stdbool.h>
 #include <stdlib.h>

examples/embedded.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 #include <GLES2/gl2.h>

examples/fullscreen-shell.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>

examples/output-layers.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>

examples/output-layout.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
 #include <limits.h>
 #include <math.h>

examples/pointer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <math.h>
 #include <stdio.h>

examples/rotation.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
 #include <getopt.h>
 #include <math.h>

examples/scene-graph.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <getopt.h>
 #include <stdbool.h>

examples/simple.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>

examples/tablet.c

@@ -1,4 +1,5 @@
-#define _XOPEN_SOURCE 600
+#undef _POSIX_C_SOURCE
+#define _XOPEN_SOURCE 600 // for M_PI
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>

examples/touch.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
 #include <math.h>
 #include <stdint.h>

meson.build

@@ -21,6 +21,7 @@ little_endian = target_machine.endian() == 'little'
 big_endian = target_machine.endian() == 'big'
 
 add_project_arguments([
+	'-D_POSIX_C_SOURCE=200809L',
 	'-DWLR_USE_UNSTABLE',
 	'-DWLR_LITTLE_ENDIAN=@0@'.format(little_endian.to_int()),
 	'-DWLR_BIG_ENDIAN=@0@'.format(big_endian.to_int()),

render/allocator/allocator.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <stdlib.h>

render/allocator/drm_dumb.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <drm_fourcc.h>

render/allocator/gbm.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <fcntl.h>

render/dmabuf.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <fcntl.h>
 #include <unistd.h>
 #include <wlr/render/dmabuf.h>

render/egl.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <fcntl.h>

render/gles2/pass.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <stdlib.h>
 #include <assert.h>
 #include <pixman.h>

render/gles2/pixel_format.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <drm_fourcc.h>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>

render/gles2/renderer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <GLES2/gl2.h>

render/gles2/texture.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <GLES2/gl2.h>

render/vulkan/renderer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <math.h>

render/vulkan/texture.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <fcntl.h>

render/vulkan/vulkan.c

@@ -1,5 +1,5 @@
-#if !defined(__FreeBSD__)
+#if defined(__FreeBSD__)
-#define _POSIX_C_SOURCE 200809L
+#undef _POSIX_C_SOURCE
 #endif
 #include <assert.h>
 #include <fcntl.h>

render/wlr_renderer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <stdbool.h>

tinywl/tinywl.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <getopt.h>
 #include <stdbool.h>

types/data_device/wlr_data_device.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/data_device/wlr_data_offer.c

@@ -1,4 +1,5 @@
-#define _XOPEN_SOURCE 700
+#undef _POSIX_C_SOURCE
+#define _XOPEN_SOURCE 700 // for ffs()
 #include <assert.h>
 #include <stdlib.h>
 #include <strings.h>

types/data_device/wlr_data_source.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/data_device/wlr_drag.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/output/output.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <backend/backend.h>
 #include <drm_fourcc.h>

types/scene/drag_icon.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <stdlib.h>
 #include "wlr/types/wlr_compositor.h"
 #include <wlr/types/wlr_scene.h>

types/scene/layer_shell_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <stdlib.h>
 #include <wlr/types/wlr_scene.h>
 #include <wlr/types/wlr_layer_shell_v1.h>

types/scene/wlr_scene.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/scene/xdg_shell.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <stdlib.h>
 #include <wlr/types/wlr_scene.h>
 #include <wlr/types/wlr_xdg_shell.h>

types/seat/wlr_seat.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/seat/wlr_seat_keyboard.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <stdlib.h>

types/seat/wlr_seat_pointer.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/seat/wlr_seat_touch.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/tablet_v2/wlr_tablet_v2.c

@@ -1,7 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
-
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/tablet_v2/wlr_tablet_v2_pad.c

@@ -1,7 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
-
 #include <assert.h>
 #include <stdlib.h>
 #include <types/wlr_tablet_v2.h>

types/tablet_v2/wlr_tablet_v2_tablet.c

@@ -1,7 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
-
 #include <assert.h>
 #include <stdlib.h>
 #include <types/wlr_tablet_v2.h>

types/tablet_v2/wlr_tablet_v2_tool.c

@@ -1,7 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
-
 #include <assert.h>
 #include <stdlib.h>
 #include <types/wlr_tablet_v2.h>

types/wlr_cursor.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <limits.h>

types/wlr_cursor_shape_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/types/wlr_cursor_shape_v1.h>

types/wlr_data_control_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/wlr_drm.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <stdlib.h>

types/wlr_export_dmabuf_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <unistd.h>

types/wlr_ext_foreign_toplevel_list_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <string.h>

types/wlr_foreign_toplevel_management_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <string.h>

types/wlr_fractional_scale_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/types/wlr_compositor.h>

types/wlr_gamma_control_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <fcntl.h>
 #include <stdlib.h>

types/wlr_idle_notify_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/types/wlr_idle_notify_v1.h>

types/wlr_input_device.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <stdlib.h>
 #include <string.h>

types/wlr_input_method_v2.c

@@ -1,6 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
 #include <assert.h>
 #include <string.h>
 #include <sys/mman.h>

types/wlr_keyboard.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/wlr_keyboard_group.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>

types/wlr_keyboard_shortcuts_inhibit_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/types/wlr_compositor.h>

types/wlr_layer_shell_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/wlr_linux_dmabuf_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <fcntl.h>

types/wlr_pointer_constraints_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <limits.h>
 #include <pixman.h>

types/wlr_pointer_gestures_v1.c

@@ -1,7 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
-
 #include <assert.h>
 #include <stdlib.h>
 #include <wayland-server-core.h>

types/wlr_presentation_time.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/wlr_primary_selection.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/types/wlr_primary_selection.h>

types/wlr_primary_selection_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <inttypes.h>
 #include <stdlib.h>

types/wlr_relative_pointer_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <inttypes.h>
 #include <stdlib.h>

types/wlr_screencopy_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <drm_fourcc.h>

types/wlr_security_context_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/wlr_session_lock_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <wayland-server-core.h>

types/wlr_shm.c

@@ -1,6 +1,4 @@
-#if !defined(__FreeBSD__)
+#undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200112L
-#endif
 #define _DEFAULT_SOURCE // for MAP_ANONYMOUS
 #include <assert.h>
 #include <drm_fourcc.h>

types/wlr_tearing_control_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <stdlib.h>

types/wlr_text_input_v3.c

@@ -1,6 +1,3 @@
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
-#endif
 #include <assert.h>
 #include <stdlib.h>
 #include <stddef.h>

types/wlr_transient_seat_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wayland-util.h>

types/wlr_virtual_keyboard_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <unistd.h>

types/wlr_virtual_pointer_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/interfaces/wlr_pointer.h>

types/wlr_xcursor_manager.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <stdlib.h>
 #include <string.h>
 #include <wlr/types/wlr_xcursor_manager.h>

types/wlr_xdg_activation_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/wlr_xdg_decoration_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdbool.h>
 #include <stdlib.h>

types/wlr_xdg_foreign_v1.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <string.h>

types/wlr_xdg_foreign_v2.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 
 #include <assert.h>
 #include <string.h>

types/xdg_shell/wlr_xdg_popup.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>

types/xdg_shell/wlr_xdg_positioner.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <wlr/util/edges.h>