winebuild: Find main/wmain in static libraries.

Have the winebuild -spec.o include an undefined .globl referencing
symbols we know the winecrt0 entry point will eventually reference,
so ld knows about that need while scanning library archives.

Signed-off-by: Kevin Puetz <PuetzKevinA@JohnDeere.com>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

tools/winebuild/build.h

@@ -300,6 +300,7 @@ extern void output_gnu_stack_note(void);
 extern void add_import_dll( const char *name, const char *filename );
 extern void add_delayed_import( const char *name );
 extern void add_extra_ld_symbol( const char *name );
+extern void add_spec_extra_ld_symbol( const char *name );
 extern void read_undef_symbols( DLLSPEC *spec, char **argv );
 extern void resolve_imports( DLLSPEC *spec );
 extern int is_undefined( const char *name );

tools/winebuild/main.c

@@ -397,11 +397,22 @@ static const char *get_default_entry_point( const DLLSPEC *spec )
     if (spec->characteristics & IMAGE_FILE_DLL) return "DllMain";
     if (spec->subsystem == IMAGE_SUBSYSTEM_NATIVE) return "DriverEntry";
     if (spec->type == SPEC_WIN16)
+    {
+        add_spec_extra_ld_symbol("WinMain16");
         return "__wine_spec_exe16_entry";
+    }
     else if (spec->unicode_app)
+    {
+        /* __wine_spec_exe_wentry always calls wmain */
+        add_spec_extra_ld_symbol("wmain");
         return "__wine_spec_exe_wentry";
+    }
     else
+    {
+        /* __wine_spec_exe_entry always calls main */
+        add_spec_extra_ld_symbol("main");
         return "__wine_spec_exe_entry";
+    }
 }
 
 /* parse options from the argv array and remove all the recognized ones */

tools/winebuild/spec32.c

@@ -50,6 +50,13 @@ int needs_get_pc_thunk = 0;
 
 static const char builtin_signature[32] = "Wine builtin DLL";
 static const char fakedll_signature[32] = "Wine placeholder DLL";
+static struct strarray spec_extra_ld_symbols = { 0 }; /* list of extra symbols that ld should resolve */
+
+/* add a symbol to the list of extra symbols that ld must resolve */
+void add_spec_extra_ld_symbol( const char *name )
+{
+    strarray_add( &spec_extra_ld_symbols, name, NULL );
+}
 
 static unsigned int hash_filename( const char *name )
 {
@@ -610,6 +617,7 @@ void output_exports( DLLSPEC *spec )
 void output_module( DLLSPEC *spec )
 {
     int machine = 0;
+    int i;
     unsigned int page_size = get_page_size();
     const char *data_dirs[16] = { NULL };
 
@@ -688,6 +696,10 @@ void output_module( DLLSPEC *spec )
     output( "\t.long 0\n" );              /* SizeOfCode */
     output( "\t.long 0\n" );              /* SizeOfInitializedData */
     output( "\t.long 0\n" );              /* SizeOfUninitializedData */
+
+    for (i = 0; i < spec_extra_ld_symbols.count; i++)
+        output( "\t.globl %s\n", asm_name(spec_extra_ld_symbols.str[i]) );
+
     /* note: we expand the AddressOfEntryPoint field on 64-bit by overwriting the BaseOfCode field */
     output( "\t%s %s\n",                  /* AddressOfEntryPoint */
             get_asm_ptr_keyword(), spec->init_func ? asm_name(spec->init_func) : "0" );