RFA: cygwin-specific patch for ldfile.c

["Charles S. Wilson" <cwilson at ece dot gatech dot edu>]

The following patch to binutils/ld/ldfile.c allows ld to search the
library path for foo.dll and libfoo.dll, prior to searching for
libfoo.a, in response to a '-lfoo' argument if linking is dynamic
(-Bdynamic). This takes advantage of the recent ability of ld to link
against a dll without an explicit import library (that is, generating an
implicit import lib from the dll on-the-fly)

This may also work for MINGW, but I can't test that; for now, I just
guarded the extra code with '#ifdef __CYGWIN__' instead of '#if defined
(__CYGWIN__) || (MINGW)'.

The patch is against binutils-19990818, which is the most recent version
distributed with cygwin. It is pasted below for your perusal, and a
gzipped & uuencoded version is attached as well.

--Chuck Wilson

----------------------snip---------------------
--- ldfile.c.orig       Mon May 15 12:59:05 2000
+++ ldfile.c    Mon May 15 13:34:05 2000
@@ -241,6 +241,18 @@
           arch != (search_arch_type *) NULL;
           arch = arch->next)
        {
+#ifdef __CYGWIN__
+         /* First look for foo.dll, then libfoo.dll */
+         /* This is *before* hunting for libfoo.a, if and only if
-Bdynamic */
+         if (entry->dynamic) {
+                if (ldfile_open_file_search (arch->name, entry, "",
".dll")) {
+                       return;
+                }
+           if (ldfile_open_file_search (arch->name, entry, "lib",
".dll")) {
+             return;
+           }
+         }
+#endif
          if (ldfile_open_file_search (arch->name, entry, "lib", ".a"))
            return;
 #ifdef VMS
----------------------snip------------------------


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