[Buildroot] [PATCH] package/directfb: enable on riscv32 again

[Steffen Persvold <spersvold@gmail.com>]

Newer 32bit architectures like RISCV32 and ARC are using 64bit time_t
from the get go unlike other 32bit architectures, therefore aliasing
__NR_futex to __NR_futex_time64 avoids the build error mentioned
in cb6fd050.

Fixes:
 - http://autobuild.buildroot.org/results/c0f4168575fa85af933539441eea95a3b10dac91

Signed-off-by: Steffen Persvold <spersvold@gmail.com>
---
 ...-__NR_futex-on-32bit-architectures-u.patch | 40 +++++++++++++++++++
 package/directfb/Config.in                    |  2 -
 2 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 package/directfb/0007-libdirect-define-__NR_futex-on-32bit-architectures-u.patch

diff --git a/package/directfb/0007-libdirect-define-__NR_futex-on-32bit-architectures-u.patch b/package/directfb/0007-libdirect-define-__NR_futex-on-32bit-architectures-u.patch
new file mode 100644
index 00000000..0dea27b7
--- /dev/null
+++ b/package/directfb/0007-libdirect-define-__NR_futex-on-32bit-architectures-u.patch
@@ -0,0 +1,40 @@
+From 8ffd68a8dfa1e8671dd8c01b96faffd681deca4e Mon Sep 17 00:00:00 2001
+From: Steffen Persvold <spersvold@gmail.com>
+Date: Tue, 25 Jun 2024 14:14:49 +0200
+Subject: [PATCH] libdirect: define __NR_futex on 32bit architectures using
+ 64-bit time_t
+
+Newer 32bit architectures like RISCV32 and ARC are using 64bit time_t
+from the get go unlike other 32bit architectures, therefore aliasing
+__NR_futex to __NR_futex_time64 helps avoid the below errors :
+
+system.c:242:21: error: '__NR_futex' undeclared (first use in this function)
+  242 |      ret = syscall( __NR_futex, uaddr, op, val, timeout, uaddr2, val3 );
+      |                     ^~~~~~~~~~
+---
+ lib/direct/os/linux/glibc/system.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/lib/direct/os/linux/glibc/system.c b/lib/direct/os/linux/glibc/system.c
+index 32086a25..7143442b 100644
+--- a/lib/direct/os/linux/glibc/system.c
++++ b/lib/direct/os/linux/glibc/system.c
+@@ -213,6 +213,10 @@ direct_getenv( const char *name )
+ 
+ /**********************************************************************************************************************/
+ 
++#if defined(__NR_futex_time64) && !defined(__NR_futex)
++#define __NR_futex __NR_futex_time64
++#endif
++
+ DirectResult
+ direct_futex( int *uaddr, int op, int val, const struct timespec *timeout, int *uaddr2, int val3 )
+ {
+@@ -245,4 +249,3 @@ direct_futex( int *uaddr, int op, int val, const struct timespec *timeout, int *
+ 
+      return DR_OK;
+ }
+-
+-- 
+2.40.1
+
diff --git a/package/directfb/Config.in b/package/directfb/Config.in
index f4d6b8cb..20481f56 100644
--- a/package/directfb/Config.in
+++ b/package/directfb/Config.in
@@ -1,6 +1,5 @@
 config BR2_PACKAGE_DIRECTFB
 	bool "directfb"
-	depends on !BR2_RISCV_32
 	depends on !BR2_STATIC_LIBS # static link issues
 	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL
 	depends on BR2_INSTALL_LIBSTDCPP
@@ -162,7 +161,6 @@ config BR2_PACKAGE_DIRECTFB_TESTS
 endif # BR2_PACKAGE_DIRECTFB
 
 comment "directfb needs a glibc or uClibc toolchain w/ C++, NPTL, gcc >= 4.5, dynamic library"
-	depends on !BR2_RISCV_32
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL || !BR2_INSTALL_LIBSTDCPP || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_5 || BR2_TOOLCHAIN_USES_MUSL || \
-- 
2.40.1

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