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.
---
 backend/drm/atomic.c     | 1 -
 backend/drm/drm.c        | 1 -
 backend/drm/libliftoff.c | 1 -
 backend/drm/properties.c | 1 -
 backend/drm/util.c       | 1 -
 5 files changed, 5 deletions(-)

(limited to 'backend/drm')

diff --git a/backend/drm/atomic.c b/backend/drm/atomic.c
index 6588bdc0..bbbd064e 100644
--- a/backend/drm/atomic.c
+++ b/backend/drm/atomic.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <drm_fourcc.h>
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 42080603..d92b41d3 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <drm_mode.h>
diff --git a/backend/drm/libliftoff.c b/backend/drm/libliftoff.c
index 534e5ef2..334a660c 100644
--- a/backend/drm/libliftoff.c
+++ b/backend/drm/libliftoff.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <fcntl.h>
 #include <libliftoff.h>
 #include <sys/stat.h>
diff --git a/backend/drm/properties.c b/backend/drm/properties.c
index 4f495177..ecd0d910 100644
--- a/backend/drm/properties.c
+++ b/backend/drm/properties.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdbool.h>
 #include <stddef.h>
diff --git a/backend/drm/util.c b/backend/drm/util.c
index 0e7f3f8b..a14e5e1e 100644
--- a/backend/drm/util.c
+++ b/backend/drm/util.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <drm_fourcc.h>
 #include <drm_mode.h>
-- 
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