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build: Update scripts/makefile.*
Apply the following updates: * Tidy up the compiler flag definitions. * Update the Darwin, Linux and MSYS makefiles to match the compiler flags used in scripts/makefile.clang and scripts/makefile.gcc. * Add the `pngtest-static` target in the Darwin makefile, following on the Linux makefile. * Rewrite some of the implicit make rules to match one another more consistently. * Make corrections in the copyright years to match git log.
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@@ -1,5 +1,5 @@
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# makefile for libpng using gcc (generic, static library)
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# Copyright (C) 2000, 2020-2024 Cosmin Truta
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# Copyright (C) 2000, 2020-2025 Cosmin Truta
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# Copyright (C) 2002, 2006-2009, 2014 Glenn Randers-Pehrson
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# Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
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# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
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@@ -22,9 +22,8 @@ RM_F = rm -f
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LIBNAME = libpng16
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PNGMAJ = 16
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WARNMORE =
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CPPFLAGS = -I$(ZLIBINC) # -DPNG_DEBUG=5
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CFLAGS = -O2 -Wall -Wextra -Wundef # $(WARNMORE) -g
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CFLAGS = -O2 # -g
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ARFLAGS = rc
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LDFLAGS = -L. -L$(ZLIBLIB) -lpng16 -lz -lm # -g
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@@ -35,7 +34,7 @@ OBJS = png.o pngerror.o pngget.o pngmem.o pngpread.o \
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# Targets
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.c.o:
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$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
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$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $*.c
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all: $(LIBNAME).a pngtest
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