[Buildroot] [git commit branch/2022.05.x] package/libcurl: fix build without sched_yield

[Buildroot] [git commit branch/2022.05.x] package/libcurl: fix build without sched_yield

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=c4c7386d321edfb6a1c72f94bbffb6201b1b692b
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2022.05.x

Fix the following build failure without sched_yield raised since bump to
version 7.84.0 in commit b034109dd60a429690acf9c5501c6658c53eae13:

In file included from easy.c:89:
easy_lock.h: In function 'curl_simple_lock_lock':
easy_lock.h:56:7: error: implicit declaration of function 'sched_yield' [-Werror=implicit-function-declaration]
   56 |       sched_yield();
      |       ^~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/fbc80a0002d640210c81a4c518856c02669059b7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Baruch Siach <baruch@tkos.co.il>
Tested-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit a5adc9b658fc137d5952f9bdea8dc9a4d007d5fc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 ...include-sched-h-if-available-to-fix-build.patch | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/package/libcurl/0001-easy_lock-h-include-sched-h-if-available-to-fix-build.patch b/package/libcurl/0001-easy_lock-h-include-sched-h-if-available-to-fix-build.patch
new file mode 100644
index 0000000000..b5f0a87218
--- /dev/null
+++ b/package/libcurl/0001-easy_lock-h-include-sched-h-if-available-to-fix-build.patch
@@ -0,0 +1,30 @@
+From e2e7f54b7bea521fa8373095d0f43261a720cda0 Mon Sep 17 00:00:00 2001
+From: Daniel Stenberg <daniel@haxx.se>
+Date: Mon, 27 Jun 2022 08:46:21 +0200
+Subject: [PATCH] easy_lock.h: include sched.h if available to fix build
+
+Patched-by: Harry Sintonen
+
+Closes #9054
+
+[Retrieved from:
+https://github.com/curl/curl/commit/e2e7f54b7bea521fa8373095d0f43261a720cda0]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ lib/easy_lock.h | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/lib/easy_lock.h b/lib/easy_lock.h
+index 819f50ce815b8..1f54289ceb2d3 100644
+--- a/lib/easy_lock.h
++++ b/lib/easy_lock.h
+@@ -36,6 +36,9 @@
+ 
+ #elif defined (HAVE_ATOMIC)
+ #include <stdatomic.h>
++#if defined(HAVE_SCHED_YIELD)
++#include <sched.h>
++#endif
+ 
+ #define curl_simple_lock atomic_bool
+ #define CURL_SIMPLE_LOCK_INIT false
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