[PATCH v2 1/2] meson: move int128 checks from configure

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

(note: the test isn't working as intended, the next patches fixes it)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 configure   | 47 -----------------------------------------------
 meson.build | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 47 deletions(-)

diff --git a/configure b/configure
index c56ed53ee365..66315835a663 100755
--- a/configure
+++ b/configure
@@ -2452,41 +2452,6 @@ if compile_prog "" "" ; then
     int128=yes
 fi
 
-#########################################
-# See if 128-bit atomic operations are supported.
-
-atomic128=no
-if test "$int128" = "yes"; then
-  cat > $TMPC << EOF
-int main(void)
-{
-  unsigned __int128 x = 0, y = 0;
-  y = __atomic_load(&x, 0);
-  __atomic_store(&x, y, 0);
-  __atomic_compare_exchange(&x, &y, x, 0, 0, 0);
-  return 0;
-}
-EOF
-  if compile_prog "" "" ; then
-    atomic128=yes
-  fi
-fi
-
-cmpxchg128=no
-if test "$int128" = yes && test "$atomic128" = no; then
-  cat > $TMPC << EOF
-int main(void)
-{
-  unsigned __int128 x = 0, y = 0;
-  __sync_val_compare_and_swap_16(&x, y, x);
-  return 0;
-}
-EOF
-  if compile_prog "" "" ; then
-    cmpxchg128=yes
-  fi
-fi
-
 ########################################
 # check if ccache is interfering with
 # semantic analysis of macros
@@ -2930,18 +2895,6 @@ if test "$have_tsan" = "yes" && test 
"$have_tsan_iface_fiber" = "yes" ; then
     echo "CONFIG_TSAN=y" >> $config_host_mak
 fi
 
-if test "$int128" = "yes" ; then
-  echo "CONFIG_INT128=y" >> $config_host_mak
-fi
-
-if test "$atomic128" = "yes" ; then
-  echo "CONFIG_ATOMIC128=y" >> $config_host_mak
-fi
-
-if test "$cmpxchg128" = "yes" ; then
-  echo "CONFIG_CMPXCHG128=y" >> $config_host_mak
-fi
-
 if test "$rdma" = "yes" ; then
   echo "CONFIG_RDMA=y" >> $config_host_mak
   echo "RDMA_LIBS=$rdma_libs" >> $config_host_mak
diff --git a/meson.build b/meson.build
index 2ed1d97c97ab..a9ec3974bc67 100644
--- a/meson.build
+++ b/meson.build
@@ -1824,6 +1824,45 @@ config_host_data.set('CONFIG_ATOMIC64', cc.links('''
     return 0;
   }'''))
 
+has_int128 = cc.links('''
+  __int128_t a;
+  __uint128_t b;
+  int main (void) {
+    a = a + b;
+    b = a * b;
+    a = a * a;
+    return 0;
+  }''')
+
+config_host_data.set('CONFIG_INT128', has_int128)
+
+if has_int128
+  has_atomic128 = cc.links('''
+    int main(void)
+    {
+      unsigned __int128 x = 0, y = 0;
+      y = __atomic_load(&x, 0);
+      __atomic_store(&x, y, 0);
+      __atomic_compare_exchange(&x, &y, x, 0, 0, 0);
+      return 0;
+    }''')
+
+  config_host_data.set('CONFIG_ATOMIC128', has_atomic128)
+
+  if not has_atomic128
+    has_cmpxchg128 = cc.links('''
+      int main(void)
+      {
+        unsigned __int128 x = 0, y = 0;
+        __sync_val_compare_and_swap_16(&x, y, x);
+        return 0;
+      }
+    ''')
+
+    config_host_data.set('CONFIG_CMPXCHG128', has_cmpxchg128)
+  endif
+endif
+
 config_host_data.set('CONFIG_GETAUXVAL', cc.links(gnu_source_prefix + '''
   #include <sys/auxv.h>
   int main(void) {
-- 
2.35.1.273.ge6ebfd0e8cbb