On Fri, 30 May 2014, Janne Grunau wrote:

Clang's integrated assembler does not support it and it is optional
for GNU as.
---
libavutil/aarch64/asm.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/aarch64/asm.S b/libavutil/aarch64/asm.S
index 8ac5c18..86f24d9 100644
--- a/libavutil/aarch64/asm.S
+++ b/libavutil/aarch64/asm.S
@@ -58,7 +58,7 @@ ELF     .size   \name, . - \name

.macro  movrel rd, val
#if CONFIG_PIC
-        adrp            \rd, :pg_hi21:\val
+        adrp            \rd, \val
        add             \rd, \rd, :lo12:\val
#else
        ldr             \rd, =\val
--
2.0.0

This breaks iOS arm64 builds for me, with the following error message:

libavcodec/aarch64/h264cmc_neon.S:569:9: error: ADR/ADRP relocations must be GOT relative

// Martin
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