Land temporary workaround for clang-cl not yet understanding __emul

third_party/libopenjpeg20/opj_intmath.h

 /*
  * The copyright in this software is being made available under the 2-clauses 
  * BSD License, included below. This software may be subject to other third 
  * party and contributor rights, including patent rights, and no such rights
  * are granted under this license.
  *
  * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
  * Copyright (c) 2002-2014, Professor Benoit Macq
  * Copyright (c) 2001-2003, David Janssens
  * Copyright (c) 2002-2003, Yannick Verschueren
@@ skipping 174 matching lines @@
         return l;
 }
 
 /**
 Multiply two fixed-precision rational numbers.
 @param a
 @param b
 @return Returns a * b
 */
 static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b) {
-#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
+// TODO(thakis): Remove __clang__ once chromium's clang has clang r250301
+#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86) && !defined(__clang__)
         OPJ_INT64 temp = __emul(a, b);
 #else
         OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
 #endif
         temp += 4096;
         assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF);
         assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
         return (OPJ_INT32) (temp >> 13);
 }
 
 static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b) {
-#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
+// TODO(thakis): Remove __clang__ once chromium's clang has clang r250301
+#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86) && !defined(__clang__)
         OPJ_INT64 temp = __emul(a, b);
 #else
         OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
 #endif
         temp += 4096;
         assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF);
         assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
         return (OPJ_INT32) (temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
 }
 
 /* ----------------------------------------------------------------------- */
 /*@}*/
 
 /*@}*/
 
 #endif