From 4e0430638635083c199f81375a6c14f2ffb726fb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 11 Mar 2019 13:15:02 +0100
Subject: HiPE: Don't fail the compilation for unimplemented instructions

---
 erts/configure.in | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'erts/configure.in')

diff --git a/erts/configure.in b/erts/configure.in
index b070ad0649..5f969a0a8b 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -2783,6 +2783,32 @@ AC_SUBST(HIPE_ENABLED)
 NATIVE_LIBS_ENABLED=
 if test X${enable_native_libs} = Xyes -a X${HIPE_ENABLED} = Xyes; then
   NATIVE_LIBS_ENABLED=yes
+  cat >> $ERL_TOP/erts/CONF_INFO <<EOF
+
+                 WARNING: In OTP 22, HiPE (the native code compiler) is
+		 not fully functional. The reasons for this are:
+
+		 1. There are new BEAM instructions for binary
+		 matching that the HiPE native code compiler does not
+		 support. 
+
+		 2. The new optimizations in the Erlang compiler create
+		 new combination of instructions that HiPE currently
+		 does not handle correctly.
+
+		 If erlc is invoked like so:
+
+		     erlc +native some_file.erl
+
+                 or like so:
+
+                     erlc +native some_file.beam
+
+		 and if any of the new binary matching instructions
+		 are used, the compiler will issue a warning and
+		 produce a BEAM file without native code.
+
+EOF
 fi
 AC_SUBST(NATIVE_LIBS_ENABLED)
 
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