From e9440aeb5cad98fea9971f5126461e0a2b30ab54 Mon Sep 17 00:00:00 2001
From: fanquake <fanquake@gmail.com>
Date: Mon, 13 Dec 2021 21:25:05 +0800
Subject: [PATCH] build: use __SIZEOF_INT128__ for checking __int128
 availability

We already use this in the blockfilter code, so not sure we need to maintain two
different ways of testing for the same functionality. Consolidate on testing
for __SIZEOF_INT128__, which we already use, is supported by the compilers we
care about, and is also used by libsecp256k1.
---
 configure.ac        | 3 ---
 src/crypto/muhash.h | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 45def0908b5..da71ee93c59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -837,9 +837,6 @@ if test "$use_lcov_branch" != "no"; then
   AC_SUBST(LCOV_OPTS, "$LCOV_OPTS --rc lcov_branch_coverage=1")
 fi
 
-dnl Check for __int128
-AC_CHECK_TYPES([__int128])
-
 dnl Check for endianness
 AC_C_BIGENDIAN
 
diff --git a/src/crypto/muhash.h b/src/crypto/muhash.h
index c023a8b9d3f..0c050cd32b4 100644
--- a/src/crypto/muhash.h
+++ b/src/crypto/muhash.h
@@ -24,7 +24,7 @@ private:
 public:
     static constexpr size_t BYTE_SIZE = 384;
 
-#ifdef HAVE___INT128
+#ifdef __SIZEOF_INT128__
     typedef unsigned __int128 double_limb_t;
     typedef uint64_t limb_t;
     static constexpr int LIMBS = 48;