winebuild: Add a --prefer-native option to set a Wine-specific flag in the PE header.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>

tools/winebuild/build.h

@@ -217,6 +217,7 @@ struct strarray
 #define IMAGE_FILE_UP_SYSTEM_ONLY	   0x4000
 #define IMAGE_FILE_BYTES_REVERSED_HI	   0x8000
 
+#define IMAGE_DLLCHARACTERISTICS_PREFER_NATIVE 0x0010 /* Wine extension */
 #define IMAGE_DLLCHARACTERISTICS_NX_COMPAT     0x0100
 
 #define	IMAGE_SUBSYSTEM_NATIVE      1
@@ -380,6 +381,7 @@ extern int unwind_tables;
 extern int use_msvcrt;
 extern int unix_lib;
 extern int safe_seh;
+extern int prefer_native;
 
 extern char *input_file_name;
 extern char *spec_file_name;

tools/winebuild/main.c

@@ -49,6 +49,7 @@ int unwind_tables = 0;
 int use_msvcrt = 0;
 int unix_lib = 0;
 int safe_seh = 0;
+int prefer_native = 0;
 
 #ifdef __i386__
 enum target_cpu target_cpu = CPU_x86;
@@ -294,6 +295,7 @@ static const char usage_str[] =
 "       --nxcompat=y|n        Set the NX compatibility flag (default: yes)\n"
 "   -N, --dll-name=DLLNAME    Set the DLL name (default: from input file name)\n"
 "   -o, --output=NAME         Set the output file name (default: stdout)\n"
+"       --prefer-native       Set the flag to prefer loading native at run time\n"
 "   -r, --res=RSRC.RES        Load resources from RSRC.RES\n"
 "       --safeseh             Mark object files as SEH compatible\n"
 "       --save-temps          Do not delete the generated intermediate files\n"
@@ -329,6 +331,7 @@ enum long_options_values
     LONG_OPT_LDCMD,
     LONG_OPT_NMCMD,
     LONG_OPT_NXCOMPAT,
+    LONG_OPT_PREFER_NATIVE,
     LONG_OPT_RESOURCES,
     LONG_OPT_SAFE_SEH,
     LONG_OPT_SAVE_TEMPS,
@@ -356,6 +359,7 @@ static const struct option long_options[] =
     { "ld-cmd",        1, 0, LONG_OPT_LDCMD },
     { "nm-cmd",        1, 0, LONG_OPT_NMCMD },
     { "nxcompat",      1, 0, LONG_OPT_NXCOMPAT },
+    { "prefer-native", 0, 0, LONG_OPT_PREFER_NATIVE },
     { "resources",     0, 0, LONG_OPT_RESOURCES },
     { "safeseh",       0, 0, LONG_OPT_SAFE_SEH },
     { "save-temps",    0, 0, LONG_OPT_SAVE_TEMPS },
@@ -575,6 +579,10 @@ static char **parse_options( int argc, char **argv, DLLSPEC *spec )
         case LONG_OPT_SAFE_SEH:
             safe_seh = 1;
             break;
+        case LONG_OPT_PREFER_NATIVE:
+            prefer_native = 1;
+            spec->dll_characteristics |= IMAGE_DLLCHARACTERISTICS_PREFER_NATIVE;
+            break;
         case LONG_OPT_RESOURCES:
             set_exec_mode( MODE_RESOURCES );
             break;

tools/winebuild/spec32.c

@@ -1076,6 +1076,19 @@ void make_builtin_files( char *argv[] )
             if (header.e_lfanew < sizeof(header) + sizeof(builtin_signature))
                 fatal_error( "%s: Not enough space (%x) for Wine signature\n", argv[i], header.e_lfanew );
             write( fd, builtin_signature, sizeof(builtin_signature) );
+
+            if (prefer_native)
+            {
+                unsigned int pos = header.e_lfanew + 0x5e;  /* OptionalHeader.DllCharacteristics */
+                unsigned short dll_charact;
+                lseek( fd, pos, SEEK_SET );
+                if (read( fd, &dll_charact, sizeof(dll_charact) ) == sizeof(dll_charact))
+                {
+                    dll_charact |= IMAGE_DLLCHARACTERISTICS_PREFER_NATIVE;
+                    lseek( fd, pos, SEEK_SET );
+                    write( fd, &dll_charact, sizeof(dll_charact) );
+                }
+            }
         }
         else fatal_error( "%s: Unrecognized file format\n", argv[i] );
         close( fd );

tools/winebuild/winebuild.man.in

@@ -209,6 +209,10 @@ output file name ends in .o, the text output is sent to a
 temporary file that is then assembled to produce the specified .o
 file.
 .TP
+.B --prefer-native
+Specify that the native DLL should be preferred if available at run
+time. This can be used on modules that are mostly unimplemented.
+.TP
 .BI \-r,\ --res= rsrc.res
 Load resources from the specified binary resource file. The
 \fIrsrc.res\fR file can be produced from a source resource file with