emxbind, ld: generate binaries like OMF linkers do

[komh]

AOUT linker behaves differently from OMF linkers when generating .EXEs and .DLLs.

Here is the patch to mimic OMF linkers:

0001-emxbind-ld-generate-binaries-like-OMF-linkers-do.patch

From 50e2b3f79f68ed08aa61f61e61c4d94707e9b71a Mon Sep 17 00:00:00 2001
From: KO Myung-Hun <komh@chollian.net>
Date: Sat, 27 Jun 2015 18:09:41 +0900
Subject: [PATCH] emxbind, ld: generate binaries like OMF linkers do

1. Append default extension if not specified

.exe for the executable, .dll for DLLs.

2. Generate DLL if -Zdll is given, even if extension is not .dll

3. The behavior of -Zexe does not change for the backward compatibility

After all, emxbind and ld generate binaries like:

    -Zexe -o test[.xxx] : test[.xxx](stub) and test[.xxx].exe
    -Zexe -o test.exe   : test.exe
    -o test[.exe]       : test.exe
    -o test.dll         : test.dll(dll)
    -o test.xxx         : test.xxx(neither executable nor dll)
    -Zdll -o test[.dll] : test.dll
    -Zdll -o test.xxx   : test.xxx(dll)
---
 src/emx/src/emxbind/emxbind.c |  3 ++-
 src/emx/src/ld/ld.c           | 12 +++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/emx/src/emxbind/emxbind.c b/src/emx/src/emxbind/emxbind.c
index f59f953..1f96bfb 100644
--- a/src/emx/src/emxbind/emxbind.c
+++ b/src/emx/src/emxbind/emxbind.c
@@ -472,7 +472,8 @@ static void get_args (void)
 	  _defext (def_fname, "def");
           read_def_file ();
 	}
-      file_name (out_fname, (dll_flag ? "dll" : "exe"),
+      file_name (out_fname, (opt_o != NULL && _getext(opt_o)) ? NULL :
+                            (dll_flag ? "dll" : "exe"),
                  (opt_o != NULL ? opt_o : inp_fname));
       if (stricmp (inp_fname, out_fname) == 0)
         error ("The input and output files have the same name");
diff --git a/src/emx/src/ld/ld.c b/src/emx/src/ld/ld.c
index 4b2829c..1dd2e2e 100644
--- a/src/emx/src/ld/ld.c
+++ b/src/emx/src/ld/ld.c
@@ -1081,6 +1081,7 @@ static struct option longopts[] =
   {"Zwin32", 0, 0, 140},        /* Create GUI, CUI Win32 */
   {"Zrsx32", 0, 0, 141},        /* Create Win32/DOS win32 base */
   {"Zemx32", 0, 0, 142},        /* Create Win32/DOS emx base */
+  {"Zdll", 0, 0, 143},          /* Create .dll file */
   {"S", 0, 0, 'S'},
   {"T", 1, 0, 'T'},
   {"Ttext", 1, 0, 'T'},
@@ -1281,6 +1282,10 @@ decode_command (argc, argv)
           rsxnt_linked = RSXNT_EMX;
           break;
 
+        case 143:               /* -Zdll */
+          dll_flag = 1;
+          break;
+
         case 'R':
 	  reloc_flag = 1;
 	  break;
@@ -3850,10 +3855,15 @@ void check_exe (void)
   else
     {
       ext = _getext2 (output_filename);
-      if (stricmp (ext, ".dll") == 0)
+      if (dll_flag || stricmp (ext, ".dll") == 0)
         {
+          if (!*ext)
+            output_filename = concat (output_filename, ".dll", NULL);
+
           reloc_flag = 1; dll_flag = 1;
         }
+      else if (!*ext)
+          output_filename = concat (output_filename, ".exe", NULL);
       else if (stricmp (ext, ".exe") != 0)
         {
           exe_filename = NULL;
-- 
2.50.1