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scripts: Set the compiler warning options to "-Wall -Wextra -Wundef"
Considering that "-Wextra" is a more descriptive alternative to "-W", and that "-Wundef" is a highly useful warning option that has been available in ancient versions of gcc (version 2.x), we replace all occurrences of "-W -Wall" with "-Wall -Wextra -Wundef". Also clean up the makefiles.
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@@ -1,5 +1,5 @@
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# makefile for libpng
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# Copyright (C) 2020 Cosmin Truta
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# Copyright (C) 2020-2022 Cosmin Truta
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# Copyright (C) 1998-2014 Glenn Randers-Pehrson
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# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
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#
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@@ -50,7 +50,7 @@ pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
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$(CP) $(PNGLIBCONF_H_PREBUILT) $@
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libpng.a: $(OBJS)
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ar rc $@ $(OBJS)
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ar rc $@ $(OBJS)
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$(RANLIB) $@
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pngtest: pngtest.o libpng.a
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