winebuild: Support a -mno-cygwin flag.

tools/winebuild/build.h

@@ -363,6 +363,7 @@ extern int verbose;
 extern int link_ext_symbols;
 extern int force_pointer_size;
 extern int unwind_tables;
+extern int use_msvcrt;
 extern int unix_lib;
 extern int safe_seh;
 

tools/winebuild/import.c

@@ -643,7 +643,7 @@ void read_undef_symbols( DLLSPEC *spec, char **argv )
             add_undef_import( p + strlen( import_func_prefix ), 0 );
         else if (!strncmp( p, import_ord_prefix, strlen(import_ord_prefix) ))
             add_undef_import( p + strlen( import_ord_prefix ), 1 );
-        else if (!unix_lib || !find_name( p, &stdc_functions ))
+        else if (use_msvcrt || !find_name( p, &stdc_functions ))
             strarray_add( &undef_symbols, xstrdup( p ), NULL );
     }
     if ((err = pclose( f ))) warning( "%s failed with status %d\n", cmd, err );

tools/winebuild/main.c

@@ -46,6 +46,7 @@ int verbose = 0;
 int link_ext_symbols = 0;
 int force_pointer_size = 0;
 int unwind_tables = 0;
+int use_msvcrt = 0;
 int unix_lib = 0;
 int safe_seh = 0;
 
@@ -445,6 +446,7 @@ static char **parse_options( int argc, char **argv, DLLSPEC *spec )
             else if (!strcmp( optarg, "64" )) force_pointer_size = 8;
             else if (!strcmp( optarg, "arm" )) thumb_mode = 0;
             else if (!strcmp( optarg, "thumb" )) thumb_mode = 1;
+            else if (!strcmp( optarg, "no-cygwin" )) use_msvcrt = 1;
             else if (!strcmp( optarg, "unix" )) unix_lib = 1;
             else if (!strncmp( optarg, "cpu=", 4 )) cpu_option = xstrdup( optarg + 4 );
             else if (!strncmp( optarg, "fpu=", 4 )) fpu_option = xstrdup( optarg + 4 );

tools/winebuild/winebuild.man.in

@@ -177,9 +177,12 @@ Generate respectively 16-bit, 32-bit or 64-bit code.
 .BI \-marm,\ \-mthumb,\ \-march= option ,\ \-mcpu= option ,\ \-mfpu= option ,\ \-mfloat-abi= option
 Set code generation options for the assembler.
 .TP
+.B \-mno-cygwin
+Build a library that uses the Windows runtime instead of the Unix C
+library.
+.TP
 .B \-munix
-Build a library that imports standard functions from the Unix C
-library instead of the Windows runtime.
+Build the Unix counterpart of a builtin module.
 .TP
 .BI \-M,\ --main-module= module
 When building a 16-bit dll, set the name of its 32-bit counterpart to