add Patch0: respect system compiler-flags

- touch a fake configure-script during prep
- export system cflags invoking configure-macro

pngquant.spec

@@ -3,12 +3,15 @@
 
 Name:		pngquant
 Version:	1.8.3
-Release:	2%{?dist}
+Release:	3%{?dist}
 Summary:	PNG quantization tool for reducing image file size
 License:	BSD with advertising
 URL:		http://%{name}.org
 Source0:	http://%{name}.org/%{name}-%{version}-src.tar.bz2
 
+# this will be in the next version
+Patch0:		pngquant_respect_system_flags.patch
+
 BuildRequires:	libpng-devel
 
 
@@ -23,26 +26,27 @@ median cut algorithm.
 
 %prep
 %setup -q
+%patch0
 
 
 %build
-# Using {C,LD}FLAGSADD here makes sure {optflags}
-# are appended to {C,LD}FLAGS set in Makefile.
+# since there is no autotools/configure-script in sources
+echo '#!/bin/sh' > configure
+chmod +x configure
+
+#have the compiler-flags exported properly
+%configure
 
-make	%{?_smp_mflags} \
-	CFLAGSADD="%{optflags}" \
-	LDFLAGSADD="%{optflags}"
+make %{?_smp_mflags}
 
 
 %install
-# repeating {C,LD}FLAGSADD from plain `make`
-# is required during install or `make install`
-# will start recompiling source without them.
+# have the compiler-flags exported properly, again
+# otherwise make_install will trigger rebuild without
+# proper compiler-flags
+%configure
 
-%make_install \
-	PREFIX=%{_prefix} \
-	CFLAGSADD="%{optflags}" \
-	LDFLAGSADD="%{optflags}"
+%make_install PREFIX=%{_prefix}
 
 install	-Dpm0644 %{name}.1 \
 	%{buildroot}/%{_mandir}/man1/%{name}.1
@@ -55,6 +59,11 @@ install	-Dpm0644 %{name}.1 \
 
 
 %changelog
+* Sun May 19 2013 Björn Esser <bjoern.esser@gmail.com> - 1.8.3-3
+- add Patch0: respect system compiler-flags
+- touch a fake configure-script during prep
+- export system cflags invoking configure-macro
+
 * Fri May 17 2013 Björn Esser <bjoern.esser@gmail.com> - 1.8.3-2
 - changed License: BSD --> BSD with advertising
 - removed -n{name}-{version} from prep

pngquant_respect_system_flags.patch

@@ -0,0 +1,37 @@
+--- Makefile	2013-02-26 01:03:50.000000000 +0100
++++ Makefile	2013-05-19 09:24:50.001314584 +0200
+@@ -12,13 +12,20 @@
+ # Alternatively, build libpng in this directory:
+ CUSTOMLIBPNG ?= ../libpng
+ 
+-CFLAGSOPT ?= -DNDEBUG -O3 -fstrict-aliasing -ffast-math -funroll-loops -fomit-frame-pointer -ffinite-math-only
++CFLAGSSYS := $(CFLAGS)
++LDFLAGSSYS := $(LDFLAGS)
+ 
+-CFLAGS ?= -Wall -Wno-unknown-pragmas -I. -I$(CUSTOMLIBPNG) -I/usr/local/include/ -I/usr/include/ -I/usr/X11/include/ $(CFLAGSOPT)
+-CFLAGS += -std=c99 $(CFLAGSADD)
++CFLAGSOPT ?= -DNDEBUG -O3 -fstrict-aliasing -ffast-math -funroll-loops
++CFLAGSOPT += -fomit-frame-pointer -ffinite-math-only
++CFLAGSOPT += -Wall -Wno-unknown-pragmas -I. -I$(CUSTOMLIBPNG) -I$(CUSTOMZLIB)
++CFLAGSOPT += -I/usr/local/include/ -I/usr/include/ -I/usr/X11/include/
++CFLAGSOPT += -std=c99 
+ 
+-LDFLAGS ?= -L$(CUSTOMLIBPNG) -L/usr/local/lib/ -L/usr/lib/ -L/usr/X11/lib/
+-LDFLAGS += -lpng -lm $(LDFLAGSADD)
++LDFLAGSOPT ?= -L$(CUSTOMLIBPNG) -L/usr/local/lib/ -L/usr/lib/ -L/usr/X11/lib/
++LDFLAGSOPT += -lpng -lm 
++
++CFLAGS = $(CFLAGSOPT) $(CFLAGSADD) $(CFLAGSSYS)
++LDFLAGS = $(LDFLAGSOPT) $(LDFLAGSADD) $(LDFLAGSSYS)
+ 
+ OBJS = pngquant.o rwpng.o pam.o mediancut.o blur.o mempool.o viter.o nearest.o
+ COCOA_OBJS = rwpng_cocoa.o
+@@ -28,7 +35,7 @@
+ TARFILE = $(TARNAME)-src.tar.bz2
+ 
+ ifdef USE_COCOA
+-CFLAGS += -DUSE_COCOA=1
++CFLAGSOPT += -DUSE_COCOA=1
+ OBJS += $(COCOA_OBJS)
+ FRAMEWORKS += -framework Cocoa
+ endif