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diff --git a/third_party/wasm2c/src/config.h.in b/third_party/wasm2c/src/config.h.in
new file mode 100644
index 0000000000..f7187c3228
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+++ b/third_party/wasm2c/src/config.h.in
@@ -0,0 +1,332 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WABT_CONFIG_H_
+#define WABT_CONFIG_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#cmakedefine WABT_VERSION_STRING "@WABT_VERSION_STRING@"
+
+#cmakedefine WABT_DEBUG @WABT_DEBUG@
+
+/* TODO(binji): nice way to define these with WABT_ prefix? */
+
+/* Whether <alloca.h> is available */
+#cmakedefine01 HAVE_ALLOCA_H
+
+/* Whether <unistd.h> is available */
+#cmakedefine01 HAVE_UNISTD_H
+
+/* Whether snprintf is defined by stdio.h */
+#cmakedefine01 HAVE_SNPRINTF
+
+/* Whether ssize_t is defined by stddef.h */
+#cmakedefine01 HAVE_SSIZE_T
+
+/* Whether strcasecmp is defined by strings.h */
+#cmakedefine01 HAVE_STRCASECMP
+
+/* Whether ENABLE_VIRTUAL_TERMINAL_PROCESSING is defined by windows.h */
+#cmakedefine01 HAVE_WIN32_VT100
+
+/* Whether the target architecture is big endian */
+#cmakedefine01 WABT_BIG_ENDIAN
+
+/* Whether <openssl/sha.h> is available */
+#cmakedefine01 HAVE_OPENSSL_SHA_H
+
+#cmakedefine01 COMPILER_IS_CLANG
+#cmakedefine01 COMPILER_IS_GNU
+#cmakedefine01 COMPILER_IS_MSVC
+
+#cmakedefine01 WITH_EXCEPTIONS
+
+#define SIZEOF_SIZE_T @SIZEOF_SIZE_T@
+
+#if HAVE_ALLOCA_H
+#include <alloca.h>
+#elif COMPILER_IS_MSVC
+#include <malloc.h>
+#define alloca _alloca
+#elif defined(__MINGW32__)
+#include <malloc.h>
+#endif
+
+#if COMPILER_IS_CLANG || COMPILER_IS_GNU
+
+#define WABT_UNLIKELY(x) __builtin_expect(!!(x), 0)
+#define WABT_LIKELY(x) __builtin_expect(!!(x), 1)
+
+#define WABT_VECTORCALL
+
+#if __MINGW32__
+// mingw defaults to printf format specifier being ms_printf (which doesn't
+// understand 'llu', etc.) We always want gnu_printf, and force mingw to always
+// use mingw_printf, mingw_vprintf, etc.
+#define WABT_PRINTF_FORMAT(format_arg, first_arg) \
+  __attribute__((format(gnu_printf, (format_arg), (first_arg))))
+#else
+#define WABT_PRINTF_FORMAT(format_arg, first_arg) \
+  __attribute__((format(printf, (format_arg), (first_arg))))
+#endif
+
+#ifdef __cplusplus
+#define WABT_STATIC_ASSERT(x) static_assert((x), #x)
+#else
+#define WABT_STATIC_ASSERT(x) _Static_assert((x), #x)
+#endif
+
+#elif COMPILER_IS_MSVC
+
+#include <intrin.h>
+#include <string.h>
+
+#define WABT_STATIC_ASSERT(x) _STATIC_ASSERT(x)
+#define WABT_UNLIKELY(x) (x)
+#define WABT_LIKELY(x) (x)
+#define WABT_PRINTF_FORMAT(format_arg, first_arg)
+
+#define WABT_VECTORCALL __vectorcall
+
+#else
+
+#error unknown compiler
+
+#endif
+
+#define WABT_UNREACHABLE abort()
+
+#ifdef __cplusplus
+
+namespace wabt {
+
+#if COMPILER_IS_CLANG || COMPILER_IS_GNU
+
+inline int Clz(unsigned x) { return x ? __builtin_clz(x) : sizeof(x) * 8; }
+inline int Clz(unsigned long x) { return x ? __builtin_clzl(x) : sizeof(x) * 8; }
+inline int Clz(unsigned long long x) { return x ? __builtin_clzll(x) : sizeof(x) * 8; }
+
+inline int Ctz(unsigned x) { return x ? __builtin_ctz(x) : sizeof(x) * 8; }
+inline int Ctz(unsigned long x) { return x ? __builtin_ctzl(x) : sizeof(x) * 8; }
+inline int Ctz(unsigned long long x) { return x ? __builtin_ctzll(x) : sizeof(x) * 8; }
+
+inline int Popcount(uint8_t x) { return __builtin_popcount(x); }
+inline int Popcount(unsigned x) { return __builtin_popcount(x); }
+inline int Popcount(unsigned long x) { return __builtin_popcountl(x); }
+inline int Popcount(unsigned long long x) { return __builtin_popcountll(x); }
+
+#elif COMPILER_IS_MSVC
+
+#if _M_IX86
+inline unsigned long LowDword(unsigned __int64 value) {
+  return (unsigned long)value;
+}
+
+inline unsigned long HighDword(unsigned __int64 value) {
+  unsigned long high;
+  memcpy(&high, (unsigned char*)&value + sizeof(high), sizeof(high));
+  return high;
+}
+#endif
+
+inline int Clz(unsigned long mask) {
+  if (mask == 0)
+    return 32;
+
+  unsigned long index;
+  _BitScanReverse(&index, mask);
+  return sizeof(unsigned long) * 8 - (index + 1);
+}
+
+inline int Clz(unsigned int mask) {
+  return Clz((unsigned long)mask);
+}
+
+inline int Clz(unsigned __int64 mask) {
+#if _M_X64 || _M_ARM64
+  if (mask == 0)
+    return 64;
+
+  unsigned long index;
+  _BitScanReverse64(&index, mask);
+  return sizeof(unsigned __int64) * 8 - (index + 1);
+#elif _M_IX86
+  int result = Clz(HighDword(mask));
+  if (result == 32)
+    result += Clz(LowDword(mask));
+
+  return result;
+#else
+#error unexpected architecture
+#endif
+}
+
+inline int Ctz(unsigned long mask) {
+  if (mask == 0)
+    return 32;
+
+  unsigned long index;
+  _BitScanForward(&index, mask);
+  return index;
+}
+
+inline int Ctz(unsigned int mask) {
+  return Ctz((unsigned long)mask);
+}
+
+inline int Ctz(unsigned __int64 mask) {
+#if _M_X64 || _M_ARM64
+  if (mask == 0)
+    return 64;
+
+  unsigned long index;
+  _BitScanForward64(&index, mask);
+  return index;
+#elif _M_IX86
+  int result = Ctz(LowDword(mask));
+  if (result == 32)
+    result += Ctz(HighDword(mask));
+
+  return result;
+#else
+#error unexpected architecture
+#endif
+}
+
+#if _M_ARM64
+//https://stackoverflow.com/a/70012905
+template <typename T>
+int BrianKernighanPopcount(T value) {
+  int count;
+  for(count = 0; value; count++)
+  {
+    value &= value - 1;
+  }
+  return count;
+}
+#endif
+
+inline int Popcount(unsigned long value) {
+  #if _M_X64 || _M_IX86
+  return __popcnt(value);
+#elif _M_ARM64
+  return BrianKernighanPopcount(value);
+#else
+#error unexpected architecture
+#endif
+}
+
+inline int Popcount(uint8_t value) {
+  return Popcount((unsigned long)value);
+}
+
+inline int Popcount(unsigned int value) {
+  return Popcount((unsigned long)value);
+}
+
+inline int Popcount(unsigned __int64 value) {
+#if _M_X64
+  return __popcnt64(value);
+#elif _M_IX86
+  return Popcount(HighDword(value)) + Popcount(LowDword(value));
+#elif _M_ARM64
+  return BrianKernighanPopcount(value);
+#else
+#error unexpected architecture
+#endif
+}
+
+#else
+
+#error unknown compiler
+
+#endif
+
+}  // namespace wabt
+
+#if COMPILER_IS_MSVC
+
+/* print format specifier for size_t */
+#if SIZEOF_SIZE_T == 4
+#define PRIzd "d"
+#define PRIzx "x"
+#elif SIZEOF_SIZE_T == 8
+#define PRIzd "I64d"
+#define PRIzx "I64x"
+#else
+#error "weird sizeof size_t"
+#endif
+
+#elif COMPILER_IS_CLANG || COMPILER_IS_GNU
+
+/* print format specifier for size_t */
+#define PRIzd "zd"
+#define PRIzx "zx"
+
+#else
+
+#error unknown compiler
+
+#endif
+
+#if HAVE_SNPRINTF
+#define wabt_snprintf snprintf
+#elif COMPILER_IS_MSVC
+/* can't just use _snprintf because it doesn't always null terminate */
+#include <cstdarg>
+int wabt_snprintf(char* str, size_t size, const char* format, ...);
+#else
+#error no snprintf
+#endif
+
+#if COMPILER_IS_MSVC
+/* can't just use vsnprintf because it doesn't always null terminate */
+int wabt_vsnprintf(char* str, size_t size, const char* format, va_list ap);
+#else
+#define wabt_vsnprintf vsnprintf
+#endif
+
+#if !HAVE_SSIZE_T
+#if COMPILER_IS_MSVC
+/* define ssize_t identically to how LLVM does, to avoid conflicts if including both */
+#if defined(_WIN64)
+typedef signed __int64 ssize_t;
+#else
+typedef signed int ssize_t;
+#endif /* _WIN64 */
+#else
+typedef long ssize_t;
+#endif
+#endif
+
+#if !HAVE_STRCASECMP
+#if COMPILER_IS_MSVC
+#define strcasecmp _stricmp
+#else
+#error no strcasecmp
+#endif
+#endif
+
+double wabt_convert_uint64_to_double(uint64_t x);
+float wabt_convert_uint64_to_float(uint64_t x);
+double wabt_convert_int64_to_double(int64_t x);
+float wabt_convert_int64_to_float(int64_t x);
+
+#endif  // __cplusplus
+
+#endif /* WABT_CONFIG_H_ */