win32: adjust new unicode support

- lib/Makefile: add (win)crt1_w.o

- crt1.c/_runtmain: return to tcc & only use for UNICODE
  (because it might be not 100% reliable with for example
  wildcards (tcc *.c -run ...)

- tccrun.c/tccpe.c: load -run startup_code only if called
  from tcc_run(). Otherwise main may not be defined.  See
  libtcc_test.c

- tests2/Makefile: pass extra options in FLAGS to allow
  overriding TCC

Also:
- tccpe.c: support weak attribute.  (I first tried to solve
  the problem above by using it but then didn't)

win32/build-tcc.bat

@@ -137,12 +137,12 @@ copy>nul tiny_libmaker.exe tiny_libmaker-m%T%.exe
 %CC% -o tiny_libmaker-m%TX%.exe tools\tiny_libmaker.c %DX%
 
 :libtcc1.a
-@set O1=libtcc1.o crt1.o wincrt1.o crt1_w.o wincrt1_w.o dllcrt1.o dllmain.o chkstk.o bcheck.o
+@set O1=libtcc1.o crt1.o crt1w.o wincrt1.o wincrt1w.o dllcrt1.o dllmain.o chkstk.o bcheck.o
 .\tcc -m32 %D32% -c ../lib/libtcc1.c
 .\tcc -m32 %D32% -c lib/crt1.c
-.\tcc -m32 %D32% -c lib/crt1.c -D_UNICODE -DUNICODE -o crt1_w.o
+.\tcc -m32 %D32% -c lib/crt1w.c
 .\tcc -m32 %D32% -c lib/wincrt1.c
-.\tcc -m32 %D32% -c lib/wincrt1.c -D_UNICODE -DUNICODE -o wincrt1_w.o
+.\tcc -m32 %D32% -c lib/wincrt1w.c
 .\tcc -m32 %D32% -c lib/dllcrt1.c
 .\tcc -m32 %D32% -c lib/dllmain.c
 .\tcc -m32 %D32% -c lib/chkstk.S
@@ -153,9 +153,9 @@ tiny_libmaker-m32 lib/32/libtcc1.a %O1% alloca86.o alloca86-bt.o
 @if errorlevel 1 goto :the_end
 .\tcc -m64 %D64% -c ../lib/libtcc1.c
 .\tcc -m64 %D64% -c lib/crt1.c
-.\tcc -m64 %D64% -c lib/crt1.c -D_UNICODE -DUNICODE -o crt1_w.o
+.\tcc -m64 %D64% -c lib/crt1w.c
 .\tcc -m64 %D64% -c lib/wincrt1.c
-.\tcc -m64 %D64% -c lib/wincrt1.c -D_UNICODE -DUNICODE -o wincrt1_w.o
+.\tcc -m64 %D64% -c lib/wincrt1w.c
 .\tcc -m64 %D64% -c lib/dllcrt1.c
 .\tcc -m64 %D64% -c lib/dllmain.c
 .\tcc -m64 %D64% -c lib/chkstk.S

win32/lib/crt1.c

@@ -65,24 +65,23 @@ void _tstart(void)
     exit(ret);
 }
 
-void _runtmain(int argc0, /* as tcc passed in */ char **argv0)
+int _runtmain(int argc, /* as tcc passed in */ char **argv)
 {
-    __TRY__
-    int argc, ret;
-    _TCHAR **argv;
-    _TCHAR **env;
-    _startupinfo start_info;
+#ifdef UNICODE
+    int wargc;
+    _TCHAR **wargv, **wenv;
+    _startupinfo start_info = {0};
 
-    __set_app_type(_CONSOLE_APP);
+    __tgetmainargs(&wargc, &wargv, &wenv, _dowildcard, &start_info);
+    if (argc < wargc)
+        wargv += wargc - argc;
+#define argv wargv
+#endif
 
 #ifdef __i386
     _controlfp(_PC_53, _MCW_PC);
 #endif
-
-    start_info.newmode = 0;
-    __tgetmainargs( &argc, &argv, &env, _dowildcard, &start_info);
-    ret = _tmain(argc0, argv + argc - argc0, env);
-    exit(ret);
+    return _tmain(argc, argv, NULL);
 }
 
 // =============================================

win32/lib/crt1w.c

@@ -0,0 +1,3 @@
+#define _UNICODE 1
+#define UNICODE 1
+#include "crt1.c"

win32/lib/wincrt1.c

@@ -68,22 +68,25 @@ int _twinstart(void)
     exit(ret);
 }
 
-int _runtwinmain(int argc0, /* as tcc passed in */ char **argv0)
+int _runtwinmain(int argc, /* as tcc passed in */ char **argv)
 {
     _TCHAR *szCmd, *p;
 
-    int argc;
-    _TCHAR **argv;
-    _TCHAR **env;
-    _startupinfo start_info;
+#ifdef UNICODE
+    int wargc;
+    _TCHAR **wargv, **wenv;
+    _startupinfo start_info = {0};
 
-    start_info.newmode = 0;
-    __tgetmainargs(&argc, &argv, &env, 0, &start_info);
+    __tgetmainargs(&wargc, &wargv, &wenv, 0, &start_info);
+    if (argc < wargc)
+        wargv += wargc - argc;
+#define argv wargv
+#endif
 
     p = GetCommandLine();
     szCmd = NULL;
-    if (argc0 > 1)
-        szCmd = _tcsstr(p, argv[argc - argc0 + 1]);
+    if (argc > 1)
+        szCmd = _tcsstr(p, argv[1]);
     if (NULL == szCmd)
         szCmd = __T("");
     else if (szCmd > p && szCmd[-1] == __T('\"'))

win32/lib/wincrt1w.c

@@ -0,0 +1,3 @@
+#define _UNICODE 1
+#define UNICODE 1
+#include "wincrt1.c"