From 842093bb843ae6c719c2b1cf32eb749cab9e46ca Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Thu, 15 Feb 2024 15:34:49 +0100
Subject: 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.
---
 examples/cairo-buffer.c     | 1 -
 examples/embedded.c         | 1 -
 examples/fullscreen-shell.c | 1 -
 examples/output-layers.c    | 1 -
 examples/output-layout.c    | 1 -
 examples/pointer.c          | 1 -
 examples/rotation.c         | 1 -
 examples/scene-graph.c      | 1 -
 examples/simple.c           | 1 -
 examples/tablet.c           | 3 ++-
 examples/touch.c            | 1 -
 11 files changed, 2 insertions(+), 11 deletions(-)

(limited to 'examples')

diff --git a/examples/cairo-buffer.c b/examples/cairo-buffer.c
index d4619878..7de4a053 100644
--- a/examples/cairo-buffer.c
+++ b/examples/cairo-buffer.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 
 #include <stdbool.h>
 #include <stdlib.h>
diff --git a/examples/embedded.c b/examples/embedded.c
index 7b33d839..ff8b8851 100644
--- a/examples/embedded.c
+++ b/examples/embedded.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 #include <GLES2/gl2.h>
diff --git a/examples/fullscreen-shell.c b/examples/fullscreen-shell.c
index 46923d9f..c12f126e 100644
--- a/examples/fullscreen-shell.c
+++ b/examples/fullscreen-shell.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/examples/output-layers.c b/examples/output-layers.c
index 1b34d584..cd05d9f0 100644
--- a/examples/output-layers.c
+++ b/examples/output-layers.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/examples/output-layout.c b/examples/output-layout.c
index 4400685c..3a3eeb24 100644
--- a/examples/output-layout.c
+++ b/examples/output-layout.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
 #include <limits.h>
 #include <math.h>
diff --git a/examples/pointer.c b/examples/pointer.c
index 7d1f4e4b..bb249b42 100644
--- a/examples/pointer.c
+++ b/examples/pointer.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <math.h>
 #include <stdio.h>
diff --git a/examples/rotation.c b/examples/rotation.c
index 7ee8dc78..351973f6 100644
--- a/examples/rotation.c
+++ b/examples/rotation.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
 #include <getopt.h>
 #include <math.h>
diff --git a/examples/scene-graph.c b/examples/scene-graph.c
index cbc09136..fb530c06 100644
--- a/examples/scene-graph.c
+++ b/examples/scene-graph.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <getopt.h>
 #include <stdbool.h>
diff --git a/examples/simple.c b/examples/simple.c
index 1a018829..81ed2e0e 100644
--- a/examples/simple.c
+++ b/examples/simple.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/examples/tablet.c b/examples/tablet.c
index c97cafe4..7e9116a8 100644
--- a/examples/tablet.c
+++ b/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>
diff --git a/examples/touch.c b/examples/touch.c
index f0aca30d..e1bd7381 100644
--- a/examples/touch.c
+++ b/examples/touch.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
 #include <math.h>
 #include <stdint.h>
-- 
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