From bb123c5de8f498dbc32a03f5e93643bd06a15e0c Mon Sep 17 00:00:00 2001
From: Rodrigo Kumpera <kumpera@gmail.com>
Date: Mon, 21 Aug 2017 15:14:43 -0700
Subject: [PATCH] [WASM] Hack configure.ac to support wasm. Use --enable-wasm
 instead of --host / --target

---
 configure.ac | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/configure.ac b/configure.ac
index aa0111de8ae..4fab4a365f4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -96,8 +96,15 @@ need_link_unlink=no
 #Set to extra linker flags to be passed to the runtime binaries (mono /mono-sgen)
 extra_runtime_ldflags=""
 
+
+# Hack for WASM
+# Current autotools (v1.15) doesn't have a triplet we can use for wasm so the kludge we do is to
+# work around it by using a feature flag instead
+AC_ARG_ENABLE(wasm,[  --enable-wasm	Hack to set the current runtime to target wasm], enable_wasm=$enableval)
+
 # Thread configuration inspired by sleepycat's db
 AC_MSG_CHECKING([host platform characteristics])
+
 libgc_threads=no
 has_dtrace=no
 parallel_mark=yes
@@ -107,6 +114,16 @@ host_win32=no
 target_win32=no
 platform_android=no
 host_darwin=no
+
+
+if test "x$enable_wasm" = "xyes"; then
+CFLAGS="$CFLAGS -D_REENTRANT -D_GNU_SOURCE -DNO_UNALIGNED_ACCESS -s WASM=1 -DWASM -Os"
+CPPFLAGS="$CPPFLAGS -D_REENTRANT -DUSE_MMAP -D_GNU_SOURCE -DNO_UNALIGNED_ACCESS -s WASM=1 -DWASM -Os"
+libdl="-ldl"
+libgc_threads=pthreads
+
+else
+
 case "$host" in
 	*-mingw*|*-*-cygwin*)
 		AC_DEFINE(DISABLE_PORTABILITY,1,[Disable the io-portability layer])
@@ -350,6 +367,10 @@ case "$host" in
 		libdl="-ldl"
 		;;
 esac
+
+# WASM hack
+fi
+
 AC_MSG_RESULT(ok)
 
 if test x$need_link_unlink = xyes; then
@@ -3038,6 +3059,19 @@ jit_wanted=true
 boehm_supported=true
 BTLS_SUPPORTED=no
 BTLS_PLATFORM=
+
+if test "x$enable_wasm" = "xyes"; then
+TARGET=WASM
+HOST=WASM
+arch_target=wasm
+AC_DEFINE(MONO_CROSS_COMPILE,1,[The runtime is compiled for cross-compiling mode])
+AC_DEFINE(TARGET_WASM, 1, [Target wasm])
+BTLS_SUPPORTED=no
+with_tls=pthread
+target_mach=no
+
+else
+
 case "$host" in
 	mips*)
 		TARGET=MIPS;
@@ -3440,6 +3474,8 @@ SPARC64)
 	;;
 esac
 
+#WASM hack
+fi
 
 
 dnl *************
@@ -4309,6 +4345,8 @@ AM_CONDITIONAL(HOST_X86, test x$HOST = xX86)
 AM_CONDITIONAL(HOST_AMD64, test x$HOST = xAMD64)
 AM_CONDITIONAL(HOST_ARM, test x$HOST = xARM)
 AM_CONDITIONAL(HOST_ARM64, test x$HOST = xARM64)
+AM_CONDITIONAL(HOST_WASM, test x$HOST = xWASM)
+
 AM_CONDITIONAL(CROSS_COMPILE, test "x$host" != "x$target")
 
 AC_SUBST(LIBC)
-- 
2.25.1