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)

1 files changed, 14 insertions, 11 deletions

diff --git a/tccpe.c b/tccpe.c
index 8bb3d85..cf2e475 100644
--- a/tccpe.c
+++ b/tccpe.c
@@ -358,6 +358,7 @@ struct pe_info {
     int type;
     DWORD sizeofheaders;
     ADDR3264 imagebase;
+    const char *start_symbol;
     DWORD start_addr;
     DWORD imp_offs;
     DWORD imp_size;
@@ -638,7 +639,6 @@ static int pe_write(struct pe_info *pe)
         switch (si->cls) {
             case sec_text:
                 pe_header.opthdr.BaseOfCode = addr;
-                pe_header.opthdr.AddressOfEntryPoint = addr + pe->start_addr;
                 break;
 
             case sec_data:
@@ -700,6 +700,7 @@ static int pe_write(struct pe_info *pe)
 
     //pe_header.filehdr.TimeDateStamp = time(NULL);
     pe_header.filehdr.NumberOfSections = pe->sec_count;
+    pe_header.opthdr.AddressOfEntryPoint = pe->start_addr;
     pe_header.opthdr.SizeOfHeaders = pe->sizeofheaders;
     pe_header.opthdr.ImageBase = pe->imagebase;
     pe_header.opthdr.Subsystem = pe->subsystem;
@@ -1309,6 +1310,9 @@ static int pe_check_symbols(struct pe_info *pe)
             }
 
         not_found:
+            if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
+                /* STB_WEAK undefined symbols are accepted */
+                continue;
             tcc_error_noabort("undefined symbol '%s'", name);
             ret = -1;
 
@@ -1793,8 +1797,9 @@ static void pe_add_runtime(TCCState *s1, struct pe_info *pe)
         ++start_symbol;
 
     /* grab the startup code from libtcc1 */
-    /* only (PE_Dll == pe_type) doesn't need it,
-       (TCC_OUTPUT_MEMORY == s1->output_type && PE_Dll == pe_type) is illegal */
+#ifdef TCC_IS_NATIVE
+    if (TCC_OUTPUT_MEMORY != s1->output_type || s1->runtime_main)
+#endif
     set_elf_sym(symtab_section,
         0, 0,
         ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
@@ -1817,16 +1822,10 @@ static void pe_add_runtime(TCCState *s1, struct pe_info *pe)
         }
     }
 
-    if (TCC_OUTPUT_MEMORY == s1->output_type) {
+    if (TCC_OUTPUT_MEMORY == s1->output_type)
         pe_type = PE_RUN;
-#ifdef TCC_IS_NATIVE
-        s1->runtime_main = start_symbol;
-#endif
-    } else {
-        pe->start_addr = (DWORD)(uintptr_t)tcc_get_symbol_err(s1, start_symbol);
-    }
-
     pe->type = pe_type;
+    pe->start_symbol = start_symbol;
 }
 
 static void pe_set_options(TCCState * s1, struct pe_info *pe)
@@ -1905,6 +1904,9 @@ ST_FUNC int pe_output_file(TCCState *s1, const char *filename)
                 pe_relocate_rva(&pe, s);
             }
         }
+        pe.start_addr = (DWORD)
+            ((uintptr_t)tcc_get_symbol_err(s1, pe.start_symbol)
+                - pe.imagebase);
         if (s1->nb_errors)
             ret = -1;
         else
@@ -1914,6 +1916,7 @@ ST_FUNC int pe_output_file(TCCState *s1, const char *filename)
 #ifdef TCC_IS_NATIVE
         pe.thunk = data_section;
         pe_build_imports(&pe);
+        s1->runtime_main = pe.start_symbol;
 #endif
     }