Remove obsolete compiler option on Cygwin

ChangeLog

@@ -1,3 +1,10 @@
+2018-09-01  Ken Brown  <kbrown@cornell.edu>
+
+	* configure.ac: Don't use -mno-cygwin in the Cygwin build.  This
+	has been unsupported since GCC 4 and causes the build to fail.
+	* jit/jit-dump.c (dump_object_code): Remove obsolete comment.
+	* jitdynamic/jit-dynlib.c (jit_dynlib_open): Remove obsolete code.
+
 2018-08-25  Aurelien Aptel  <aaptel@suse.com>
 
 	* jit/jit-rules-x86-64.c (small_block_copy, small_block_set): fix

configure.ac

@@ -35,27 +35,11 @@ case "$host" in
 esac
 AC_MSG_RESULT($JIT_ARCH)
 
-dnl Turn off the cygwin library if building for Win32.
 dnl Note: We have to include <stdlib.h> if we will be using "__int64"
 dnl because otherwise the mingw32 compiler won't define it correctly.
-AC_MSG_CHECKING([if building for some Win32 platform])
+AC_MSG_CHECKING([if building for Win32])
 AC_SUBST(JIT_INT64_INCLUDE)
 case "$host" in
-	*-*-cygwin*)
-		platform_win32=yes
-		if test "x$CC" = "x" ; then
-			CC="gcc -mno-cygwin"
-		fi
-		if test "x$CXX" = "x" ; then
-			if test "x$CC" = "xcl" ; then
-				CXX="cl"
-			else
-				CXX="g++ -mno-cygwin"
-			fi
-		fi
-		suppress_libm=yes
-		JIT_INT64_INCLUDE='#include <stdlib.h>'
-		;;
 	*-*-mingw*)
 		platform_win32=yes
 		if test "x$CC" = "xcl" ; then

jit/jit-dump.c

@@ -688,16 +688,6 @@ static void dump_object_code(FILE *stream, void *start, void *end)
 	int ch;
 
 #if JIT_WIN32_PLATFORM
-	/*
-	 * NOTE: If libjit is compiled on cygwin with -mno-cygwin flag then
-	 * fopen("/tmp/foo.s", ...) will use the root folder of the current
-	 * drive. That is the full file name will be like "c:/tmp/foo". But
-	 * the ``as'' and ``objdump'' utilities still use the cygwin's root.
-	 * So "as /tmp/foo.s" will look for "c:/cygwin/tmp/foo.s". To avoid
-	 * this ambiguity the file name has to contian the drive spec (e.g.
-	 * fopen("c:/tmp/foo.s", ...) and "as c;/tmp/foo.s"). Here we assume
-	 * that the TMP or TEMP environment variables always contain it.
-	 */
 	char s_path[BUFSIZ];
 	char o_path[BUFSIZ];
 	char *tmp_dir = getenv("TMP");

jitdynamic/jit-dynlib.c

@@ -234,24 +234,6 @@ jit_dynlib_handle_t jit_dynlib_open(const char *name)
 	void *libHandle;
 	char *newName = 0;
 
-#if defined(JIT_WIN32_CYGWIN) && defined(HAVE_SYS_CYGWIN_H) && \
-    defined(HAVE_CYGWIN_CONV_TO_WIN32_PATH)
-
-	/* Use Cygwin to expand the path */
-	{
-		char buf[4096];
-		if(cygwin_conv_to_win32_path(name, buf) == 0)
-		{
-			newName = jit_strdup(buf);
-			if(!newName)
-			{
-				return 0;
-			}
-		}
-	}
-
-#endif
-
 	/* Attempt to load the library */
 	libHandle = (void *)LoadLibrary((newName ? newName : name));
 	if(libHandle == 0)