audio/synthpod-lv2: fix build on aarch64

../mapper.lv2/mapper.lv2/mum.h:113:3: warning: implicit declaration of function 'asm' is invalid in C99 [-Wimplicit-function-declaration]
  asm ("umulh %0, %1, %2" : "=r" (hi) : "r" (v), "r" (p));
  ^

../mapper.lv2/mapper.lv2/mum.h:113:27: error: expected ')'
  asm ("umulh %0, %1, %2" : "=r" (hi) : "r" (v), "r" (p));
                          ^

../mapper.lv2/mapper.lv2/mum.h:113:7: note: to match this '('
  asm ("umulh %0, %1, %2" : "=r" (hi) : "r" (v), "r" (p));

reported upstream: https://github.com/OpenMusicKontrollers/synthpod/pull/54

Approved by:	portmgr (tier-2 blanket)

1 files changed, 11 insertions, 0 deletions

diff --git a/audio/synthpod-lv2/files/patch-mapper.lv2_mapper.lv2_mum.h b/audio/synthpod-lv2/files/patch-mapper.lv2_mapper.lv2_mum.h
new file mode 100644
index 000000000000..6ba11e9cfe75
--- /dev/null
+++ b/audio/synthpod-lv2/files/patch-mapper.lv2_mapper.lv2_mum.h
@@ -0,0 +1,11 @@
+--- mapper.lv2/mapper.lv2/mum.h.orig	2020-07-04 11:56:10 UTC
++++ mapper.lv2/mapper.lv2/mum.h
+@@ -110,7 +110,7 @@ _mum (uint64_t v, uint64_t p) {
+      function doing 128x128->128 bit multiplication.  The function is
+      very slow.  */
+   lo = v * p, hi;
+-  asm ("umulh %0, %1, %2" : "=r" (hi) : "r" (v), "r" (p));
++  __asm__ ("umulh %0, %1, %2" : "=r" (hi) : "r" (v), "r" (p));
+ #else
+   __uint128_t r = (__uint128_t) v * (__uint128_t) p;
+   hi = (uint64_t) (r >> 64);