MinGW64 no longer prefixes symbols with underscores by default

ChangeLog.txt

@@ -35,6 +35,14 @@ by tjEncodeYUV().
 the unaccelerated decoder and throws a warning if an unexpected marker is found
 in the middle of the JPEG data stream.
 
+[3] Older versions of MinGW64 prefixed symbol names with underscores by
+default, which differed from the behavior of 64-bit Visual C++.  MinGW64 1.0
+has adopted the behavior of 64-bit Visual C++ as the default, so to accommodate
+this, the libjpeg-turbo SIMD function names are no longer prefixed with an
+underscore when building with MinGW64.  This means that, when building
+libjpeg-turbo with older versions of MinGW64, you will now have to add
+-fno-leading-underscore to the CFLAGS.
+
 
 1.1.0
 =====

simd/jsimdext.inc

@@ -48,9 +48,7 @@
 ;
 %define SEG_TEXT    .text  align=16 public use64 class=CODE
 %define SEG_CONST   .rdata align=16 public use64 class=CONST
-%ifdef MSVC
 %define EXTN(name)  name			; foo() -> foo
-%endif
 
 %elifdef OBJ32	; ----(nasm -fobj -DOBJ32 ...)----------
 ; * Borland C++ (Win32)