fixed MinGW compilation

Makefile

@@ -14,10 +14,12 @@ ZWRAPDIR = zlibWrapper
 TESTDIR  = tests
 
 # Define nul output
-ifneq (,$(filter Windows%,$(OS)))
-VOID = nul
-else
 VOID = /dev/null
+
+ifneq (,$(filter Windows%,$(OS)))
+EXT =.exe
+else
+EXT =
 endif
 
 .PHONY: default
@@ -35,7 +37,7 @@ lib:
 
 zstd:
 	@$(MAKE) -C $(PRGDIR)
-	cp $(PRGDIR)/zstd .
+	cp $(PRGDIR)/zstd$(EXT) .
 
 .PHONY: zlibwrapper
 zlibwrapper:
@@ -51,7 +53,7 @@ clean:
 	@$(MAKE) -C $(PRGDIR) $@ > $(VOID)
 	@$(MAKE) -C $(TESTDIR) $@ > $(VOID)
 	@$(MAKE) -C $(ZWRAPDIR) $@ > $(VOID)
-	@$(RM) zstd
+	@$(RM) zstd$(EXT)
 	@echo Cleaning completed
 
 

lib/Makefile

@@ -73,9 +73,11 @@ $(LIBZSTD): LDFLAGS += -shared -fPIC
 $(LIBZSTD): $(ZSTD_FILES)
 	@echo compiling dynamic library $(LIBVER)
 	@$(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@
+ifeq (,$(filter Windows%,$(OS)))
 	@echo creating versioned links
 	@ln -sf $@.$(SHARED_EXT_VER) libzstd.$(SHARED_EXT_MAJOR)
 	@ln -sf $@.$(SHARED_EXT_VER) libzstd.$(SHARED_EXT)
+endif
 
 libzstd : $(LIBZSTD)
 

programs/Makefile

@@ -56,7 +56,6 @@ endif
 # Define *.exe as extension for Windows systems
 ifneq (,$(filter Windows%,$(OS)))
 EXT =.exe
-VOID = nul
 RES64_FILE = windres\zstd64.res
 RES32_FILE = windres\zstd32.res
 ifneq (,$(filter x86_64%,$(shell $(CC) -dumpmachine)))
@@ -66,7 +65,6 @@ else
 endif
 else
 EXT =
-VOID = /dev/null
 endif