diff --git a/Makefile b/Makefile
index 24a7c09..5052758 100644
--- a/Makefile
+++ b/Makefile
@@ -362,9 +362,6 @@ tar:    tcc-doc.html
 	rm -rf $(TCC-VERSION)
 	git reset
 
-Makefile: $(top_srcdir)/Makefile
-	cp $< $@
-
 .PHONY: all clean tar distclean install uninstall FORCE
 
 endif # ifeq ($(TOP),.)
diff --git a/lib/Makefile b/lib/Makefile
index a8a2b5d..394df67 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -111,6 +111,3 @@ $(DIR)/exists :
 
 clean :
 	rm -rfv i386-win32 x86_64-win32 i386 x86_64
-
-Makefile: $(top_srcdir)/lib/Makefile
-	cp $< $@
diff --git a/libtcc.c b/libtcc.c
index df201ae..072b77f 100644
--- a/libtcc.c
+++ b/libtcc.c
@@ -214,7 +214,7 @@ PUB_FUNC void *tcc_malloc(unsigned long size)
     void *ptr;
     ptr = malloc(size);
     if (!ptr && size)
-        tcc_error("memory full");
+        tcc_error("memory full (malloc)");
 #ifdef MEM_DEBUG
     mem_cur_size += malloc_usable_size(ptr);
     if (mem_cur_size > mem_max_size)
@@ -239,7 +239,7 @@ PUB_FUNC void *tcc_realloc(void *ptr, unsigned long size)
 #endif
     ptr1 = realloc(ptr, size);
     if (!ptr1 && size)
-        tcc_error("memory full");
+        tcc_error("memory full (realloc)");
 #ifdef MEM_DEBUG
     /* NOTE: count not correct if alloc error, but not critical */
     mem_cur_size += malloc_usable_size(ptr1);
diff --git a/tcc.h b/tcc.h
index 21957e7..0933b01 100644
--- a/tcc.h
+++ b/tcc.h
@@ -169,13 +169,18 @@
 #ifndef CONFIG_LDDIR
 # define CONFIG_LDDIR "lib"
 #endif
-#ifndef CONFIG_MULTIARCHDIR
-#define CONFIG_MULTIARCHDIR
+
+#ifdef CONFIG_MULTIARCHDIR
+# define USE_MUADIR(s) s "/" CONFIG_MULTIARCHDIR
+# define ALSO_MUADIR(s) s "/" CONFIG_MULTIARCHDIR ":" s
+#else
+# define USE_MUADIR(s) s
+# define ALSO_MUADIR(s) s
 #endif
 
 /* path to find crt1.o, crti.o and crtn.o */
 #ifndef CONFIG_TCC_CRTPREFIX
-# define CONFIG_TCC_CRTPREFIX CONFIG_SYSROOT "/usr/" CONFIG_LDDIR "/" CONFIG_MULTIARCHDIR
+# define CONFIG_TCC_CRTPREFIX USE_MUADIR(CONFIG_SYSROOT "/usr/" CONFIG_LDDIR)
 #endif
 
 /* Below: {B} is substituted by CONFIG_TCCDIR (rsp. -B option) */
@@ -186,10 +191,8 @@
 #  define CONFIG_TCC_SYSINCLUDEPATHS "{B}/include;{B}/include/winapi"
 # else
 #  define CONFIG_TCC_SYSINCLUDEPATHS \
-        CONFIG_SYSROOT "/usr/local/include/" CONFIG_MULTIARCHDIR \
-    ":" CONFIG_SYSROOT "/usr/local/include" \
-    ":" CONFIG_SYSROOT "/usr/include/" CONFIG_MULTIARCHDIR \
-    ":" CONFIG_SYSROOT "/usr/include" \
+        ALSO_MUADIR(CONFIG_SYSROOT "/usr/local/include") \
+    ":" ALSO_MUADIR(CONFIG_SYSROOT "/usr/include") \
     ":" "{B}/include"
 # endif
 #endif
@@ -197,15 +200,12 @@
 /* library search paths */
 #ifndef CONFIG_TCC_LIBPATHS
 # ifdef TCC_TARGET_PE
-#  define CONFIG_TCC_LIBPATHS "{B}/lib;{B}"
+#  define CONFIG_TCC_LIBPATHS "{B}/lib"
 # else
 #  define CONFIG_TCC_LIBPATHS \
-        CONFIG_SYSROOT "/usr/" CONFIG_LDDIR "/" CONFIG_MULTIARCHDIR \
-    ":" CONFIG_SYSROOT "/usr/" CONFIG_LDDIR \
-    ":" CONFIG_SYSROOT "/" CONFIG_LDDIR "/" CONFIG_MULTIARCHDIR \
-    ":" CONFIG_SYSROOT "/" CONFIG_LDDIR \
-    ":" CONFIG_SYSROOT "/usr/local/" CONFIG_LDDIR "/" CONFIG_MULTIARCHDIR \
-    ":" CONFIG_SYSROOT "/usr/local/" CONFIG_LDDIR
+        ALSO_MUADIR(CONFIG_SYSROOT "/usr/" CONFIG_LDDIR) \
+    ":" ALSO_MUADIR(CONFIG_SYSROOT "/" CONFIG_LDDIR) \
+    ":" ALSO_MUADIR(CONFIG_SYSROOT "/usr/local/" CONFIG_LDDIR)
 # endif
 #endif
 
@@ -237,7 +237,7 @@
 #endif
 
 /* library to use with CONFIG_USE_LIBGCC instead of libtcc1.a */
-#define TCC_LIBGCC CONFIG_SYSROOT "/" CONFIG_LDDIR "/" CONFIG_MULTIARCHDIR "/libgcc_s.so.1"
+#define TCC_LIBGCC USE_MUADIR(CONFIG_SYSROOT "/" CONFIG_LDDIR) "/libgcc_s.so.1"
 
 /* -------------------------------------------- */
 /* include the target specific definitions */
diff --git a/tccgen.c b/tccgen.c
index 8355aae..f23cd07 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -309,7 +309,7 @@ static void vsetc(CType *type, int r, CValue *vc)
     int v;
 
     if (vtop >= vstack + (VSTACK_SIZE - 1))
-        tcc_error("memory full");
+        tcc_error("memory full (vstack)");
     /* cannot let cpu flags if other instruction are generated. Also
        avoid leaving VT_JMP anywhere except on the top of the stack
        because it would complicate the code generator. */
@@ -483,7 +483,7 @@ ST_FUNC void vswap(void)
 ST_FUNC void vpushv(SValue *v)
 {
     if (vtop >= vstack + (VSTACK_SIZE - 1))
-        tcc_error("memory full");
+        tcc_error("memory full (vstack)");
     vtop++;
     *vtop = *v;
 }
@@ -2348,8 +2348,8 @@ static void gen_assign_cast(CType *dt)
     st = &vtop->type; /* source type */
     dbt = dt->t & VT_BTYPE;
     sbt = st->t & VT_BTYPE;
-    if (sbt == VT_VOID)
-        tcc_error("Cannot assign void value");
+    if (sbt == VT_VOID || dbt == VT_VOID)
+        tcc_error("cannot cast from/to void");
     if (dt->t & VT_CONSTANT)
         tcc_warning("assignment of read-only location");
     switch(dbt) {
diff --git a/tccpp.c b/tccpp.c
index aeaf6be..e1ccded 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -197,7 +197,7 @@ static TokenSym *tok_alloc_new(TokenSym **pts, const char *str, int len)
     int i;
 
     if (tok_ident >= SYM_FIRST_ANOM) 
-        tcc_error("memory full");
+        tcc_error("memory full (symbols)");
 
     /* expand token table if needed */
     i = tok_ident - TOK_IDENT;
@@ -1528,7 +1528,7 @@ include_done:
         c = (define_find(tok) != 0) ^ c;
     do_if:
         if (s1->ifdef_stack_ptr >= s1->ifdef_stack + IFDEF_STACK_SIZE)
-            tcc_error("memory full");
+            tcc_error("memory full (ifdef)");
         *s1->ifdef_stack_ptr++ = c;
         goto test_skip;
     case TOK_ELSE:
diff --git a/tests/Makefile b/tests/Makefile
index 08dfa42..b958a48 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -27,7 +27,7 @@ ifneq ($(ARCH),i386)
  TESTS := $(filter-out btest,$(TESTS))
 endif
 ifdef CONFIG_WIN32
- TESTS := $(filter-out test3,$(TESTS))
+ TESTS := w32-prep $(filter-out test3,$(TESTS))
 endif
 ifeq ($(TARGETOS),Darwin)
  TESTS := $(filter-out hello-exe test3 btest,$(TESTS))
@@ -84,6 +84,9 @@ moretests:
 	@echo ------------ $@ ------------
 	$(MAKE) -C tests2
 
+w32-prep:
+	cp ../libtcc1.a ../lib
+
 # test.ref - generate using gcc
 # copy only tcclib.h so GCC's stddef and stdarg will be used
 test.ref: tcctest.c
@@ -91,41 +94,41 @@ test.ref: tcctest.c
 	./tcctest.gcc > $@
 
 # auto test
-test1: test.ref
+test1: tcctest.c test.ref
 	@echo ------------ $@ ------------
-	$(TCC) -run $(SRCDIR)/tcctest.c > test.out1
+	$(TCC) -run $< > test.out1
 	@if diff -u test.ref test.out1 ; then echo "Auto Test OK"; fi
 
 # iterated test2 (compile tcc then compile tcctest.c !)
-test2: test.ref
+test2: tcctest.c test.ref
 	@echo ------------ $@ ------------
-	$(TCC) $(RUN_TCC) $(RUN_TCC) -run $(SRCDIR)/tcctest.c > test.out2
+	$(TCC) $(RUN_TCC) $(RUN_TCC) -run $< > test.out2
 	@if diff -u test.ref test.out2 ; then echo "Auto Test2 OK"; fi
 
 # iterated test3 (compile tcc then compile tcc then compile tcctest.c !)
-test3: test.ref
+test3: tcctest.c test.ref
 	@echo ------------ $@ ------------
-	$(TCC) $(RUN_TCC) $(RUN_TCC) $(RUN_TCC) -run $(SRCDIR)/tcctest.c > test.out3
+	$(TCC) $(RUN_TCC) $(RUN_TCC) $(RUN_TCC) -run $< > test.out3
 	@if diff -u test.ref test.out3 ; then echo "Auto Test3 OK"; fi
 
 # binary output test
-test4: test.ref
+test4: tcctest.c test.ref
 	@echo ------------ $@ ------------
 # object + link output
-	$(TCC) -c -o tcctest3.o $(SRCDIR)/tcctest.c
+	$(TCC) -c -o tcctest3.o $<
 	$(TCC) -o tcctest3 tcctest3.o
 	./tcctest3 > test3.out
 	@if diff -u test.ref test3.out ; then echo "Object Auto Test OK"; fi
 # dynamic output
-	$(TCC) -o tcctest1 $(SRCDIR)/tcctest.c
+	$(TCC) -o tcctest1 $<
 	./tcctest1 > test1.out
 	@if diff -u test.ref test1.out ; then echo "Dynamic Auto Test OK"; fi
 # dynamic output + bound check
-	$(TCC) -b -o tcctest4 $(SRCDIR)/tcctest.c
+	$(TCC) -b -o tcctest4 $<
 	./tcctest4 > test4.out
 	@if diff -u test.ref test4.out ; then echo "BCheck Auto Test OK"; fi
 # static output
-	$(TCC) -static -o tcctest2 $(SRCDIR)/tcctest.c
+	$(TCC) -static -o tcctest2 $<
 	./tcctest2 > test2.out
 	@if diff -u test.ref test2.out ; then echo "Static Auto Test OK"; fi
 
@@ -161,9 +164,9 @@ speedtest: ex2 ex3
 	time ./ex3 35
 	time $(TCC) -run $(top_srcdir)/examples/ex3.c 35
 
-weaktest: test.ref
-	$(TCC) -c tcctest.c -o weaktest.tcc.o $(CPPFLAGS) $(CFLAGS)
-	 $(CC) -c tcctest.c -o weaktest.gcc.o -I. $(CPPFLAGS) -w $(CFLAGS)
+weaktest: tcctest.c test.ref
+	$(TCC) -c $< -o weaktest.tcc.o $(CPPFLAGS) $(CFLAGS)
+	 $(CC) -c $< -o weaktest.gcc.o -I. $(CPPFLAGS) -w $(CFLAGS)
 	objdump -t weaktest.tcc.o | grep ' w ' | sed -e 's/.* \([a-zA-Z0-9_]*\)$$/\1/' | LC_ALL=C sort > weaktest.tcc.o.txt
 	objdump -t weaktest.gcc.o | grep ' w ' | sed -e 's/.* \([a-zA-Z0-9_]*\)$$/\1/' | LC_ALL=C sort > weaktest.gcc.o.txt
 	diff weaktest.gcc.o.txt weaktest.tcc.o.txt && echo "Weak Auto Test OK"
@@ -220,7 +223,5 @@ cache: tcc_g
 clean:
 	$(MAKE) -C tests2 $@
 	rm -vf *~ *.o *.a *.bin *.i *.ref *.out *.out? *.out?b *.gcc *.exe \
-	   hello libtcc_test tcctest[1234] ex? tcc_g tcclib.h
-
-Makefile: $(SRCDIR)/Makefile
-	cp $< $@
+	       hello libtcc_test tcctest[1234] ex? tcc_g tcclib.h \
+	       ../lib/libtcc1.a
diff --git a/tests/tests2/03_struct.c b/tests/tests2/03_struct.c
index df0d3e7..c5d48c5 100644
--- a/tests/tests2/03_struct.c
+++ b/tests/tests2/03_struct.c
@@ -6,7 +6,7 @@ struct fred
    int natasha;
 };
 
-void main() 
+int main()
 {
    struct fred bloggs;
 
diff --git a/tests/tests2/Makefile b/tests/tests2/Makefile
index 369ed47..51dc38d 100644
--- a/tests/tests2/Makefile
+++ b/tests/tests2/Makefile
@@ -96,6 +96,3 @@ all test: $(TESTS)
 
 clean:
 	rm -vf fred.txt *.output
-
-Makefile: $(top_srcdir)/tests/tests2/Makefile
-	cp $< $@
diff --git a/win32/build-tcc.bat b/win32/build-tcc.bat
index 772ed26..bd897c4 100644
--- a/win32/build-tcc.bat
+++ b/win32/build-tcc.bat
@@ -63,5 +63,5 @@ del *.o
 echo>..\config.texi @set VERSION %VERSION%
 if not exist doc md doc
 makeinfo --html --no-split -o doc\tcc-doc.html ../tcc-doc.texi
-if exist tcc-win32.txt move tcc-win32.txt doc\
-copy ..\tests\libtcc_test.c examples\
+copy tcc-win32.txt doc
+copy ..\tests\libtcc_test.c examples