[Buildroot] [git commit branch/2021.05.x] package/qt5/qt5base: fix build on riscv32

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=e2d1e8c5e6e34a9e93ea949c2867818a0467a893
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.x

Fix the following build failure on riscv32:

In file included from thread/qmutex_linux.cpp:45,
                 from thread/qmutex.cpp:804:
thread/qfutex_p.h: In function 'int QtLinuxFutex::_q_futex(int*, int, int, quintptr, int*, int)':
thread/qfutex_p.h:116:30: error: '__NR_futex' was not declared in this scope; did you mean '_q_futex'?
  116 |         int result = syscall(__NR_futex, addr, op | FUTEX_PRIVATE_FLAG, val, val2, addr2, val3);
      |                              ^~~~~~~~~~
      |                              _q_futex

Fixes:
 - http://autobuild.buildroot.org/results/ffedfc000029072d5d724e98ab4551fe973658ce

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
(cherry picked from commit 050be3ad358b7824b3fe9f832bc1ee494edd37d8)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 .../qt5/qt5base/0009-Fix-build-on-riscv32.patch    | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/package/qt5/qt5base/0009-Fix-build-on-riscv32.patch b/package/qt5/qt5base/0009-Fix-build-on-riscv32.patch
new file mode 100644
index 0000000000..98c7210551
--- /dev/null
+++ b/package/qt5/qt5base/0009-Fix-build-on-riscv32.patch
@@ -0,0 +1,45 @@
+From 035dc537bee26e3b63a211b2835d8560439e161f Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice at gmail.com>
+Date: Fri, 27 Aug 2021 16:28:32 +0200
+Subject: Fix build on riscv32
+
+riscv32 fails to build because __NR_futex is not defined on this
+architecture:
+
+In file included from thread/qmutex_linux.cpp:45,
+                 from thread/qmutex.cpp:804:
+thread/qfutex_p.h: In function 'int QtLinuxFutex::_q_futex(int*, int, int, quintptr, int*, int)':
+thread/qfutex_p.h:116:30: error: '__NR_futex' was not declared in this scope; did you mean '_q_futex'?
+  116 |         int result = syscall(__NR_futex, addr, op | FUTEX_PRIVATE_FLAG, val, val2, addr2, val3);
+      |                              ^~~~~~~~~~
+      |                              _q_futex
+
+Pick-to: 6.1 6.2
+Fixes: QTBUG-96067
+Change-Id: Ib6a9bcc496f37e69ac39362cb0a021fccaf311f5
+Reviewed-by: Thiago Macieira <thiago.macieira at intel.com>
+[Retrieved from:
+https://code.qt.io/cgit/qt/qtbase.git/commit/?id=035dc537bee26e3b63a211b2835d8560439e161f]
+---
+ src/corelib/thread/qfutex_p.h | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/corelib/thread/qfutex_p.h b/src/corelib/thread/qfutex_p.h
+index 40482b6fc1..037207a5c0 100644
+--- a/src/corelib/thread/qfutex_p.h
++++ b/src/corelib/thread/qfutex_p.h
+@@ -103,6 +103,11 @@ QT_END_NAMESPACE
+ // if not defined in linux/futex.h
+ #  define FUTEX_PRIVATE_FLAG        128         // added in v2.6.22
+ 
++// RISC-V does not supply __NR_futex
++#  ifndef __NR_futex
++#    define __NR_futex __NR_futex_time64
++#  endif
++
+ QT_BEGIN_NAMESPACE
+ namespace QtLinuxFutex {
+     constexpr inline bool futexAvailable() { return true; }
+-- 
+cgit v1.2.1
+