riscv: test for assembler support

This should fix the build on LLVM 16 and earlier, at the cost of turning
all non-RVV optimisations off.

2 files changed, 3 insertions, 1 deletions

diff --git a/libswscale/riscv/Makefile b/libswscale/riscv/Makefile
index 7b371d5a86..48afaf62aa 100644
--- a/libswscale/riscv/Makefile
+++ b/libswscale/riscv/Makefile
@@ -1,3 +1,3 @@
 OBJS += riscv/rgb2rgb.o
-OBJS += riscv/rgb2rgb_rvb.o
+RV-OBJS += riscv/rgb2rgb_rvb.o
 RVV-OBJS += riscv/rgb2rgb_rvv.o
diff --git a/libswscale/riscv/rgb2rgb.c b/libswscale/riscv/rgb2rgb.c
index 4fa1f5afd9..e751e11075 100644
--- a/libswscale/riscv/rgb2rgb.c
+++ b/libswscale/riscv/rgb2rgb.c
@@ -42,6 +42,7 @@ void ff_yuyvtoyuv422_rvv(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
 
 av_cold void rgb2rgb_init_riscv(void)
 {
+#if HAVE_RV
     int flags = av_get_cpu_flags();
 
 #if (__riscv_xlen == 64)
@@ -61,4 +62,5 @@ av_cold void rgb2rgb_init_riscv(void)
         }
     }
 #endif
+#endif
 }