From 011992e774fcb58966f567099f03943c57e66c2b Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Fri, 8 May 2020 22:12:24 +0200
Subject: [PATCH] meson: try to compile a little NEON program to be sure

Fixes #235
---
 meson.build | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/meson.build b/meson.build
index 17864da0c..5a49c124c 100644
--- a/meson.build
+++ b/meson.build
@@ -100,11 +100,37 @@ have_avx2 = cc.has_argument(avx2_args)
 
 have_neon = false
 if host_machine.cpu_family() == 'aarch64'
-  neon_args = []
-  have_neon = true
+  if cc.compiles('''
+    #include <arm_neon.h>
+    int main () {
+      float *s;
+      asm volatile(
+	"      ld1 { v0.4s }, [%[s]], #16\n"
+        "      fcvtzs v0.4s, v0.4s, #31\n"
+	: [s] "+r" (s) : :);
+    }
+    ''',
+    name : 'aarch64 Neon Support')
+      neon_args = []
+      have_neon = true
+
+  endif
 elif cc.has_argument('-mfpu=neon')
-  neon_args = ['-mfpu=neon']
-  have_neon = true
+  if cc.compiles('''
+    #include <arm_neon.h>
+    int main () {
+      float *s;
+      asm volatile(
+        "      vld1.32 { q0 }, [%[s]]!\n"
+        "      vcvt.s32.f32 q0, q0, #31\n"
+	: [s] "+r" (s) : :);
+    }
+    ''',
+    args: '-mfpu=neon',
+    name : 'arm Neon Support')
+      neon_args = ['-mfpu=neon']
+      have_neon = true
+  endif
 endif