app-arch/zopfli: respect CC, CXX, CFLAGS, CXXFLAGS, and LDFLAGS

app-arch/zopfli/files/zopfli-1.0.1-makefile.patch

@@ -0,0 +1,44 @@
+--- zopfli-zopfli-1.0.1/Makefile
++++ zopfli-zopfli-1.0.1/Makefile
+@@ -1,8 +1,10 @@
+-CC = gcc
+-CXX = g++
++CC ?= gcc
++CXX ?= g++
+
+-CFLAGS = -W -Wall -Wextra -ansi -pedantic -lm -O2
+-CXXFLAGS = -W -Wall -Wextra -ansi -pedantic -O2
++CFLAGS += -W -Wall -Wextra -ansi -pedantic
++CXXFLAGS += -W -Wall -Wextra -ansi -pedantic
++LIBS = -lm
++LDFLAGS += $(LIBS)
+
+ ZOPFLILIB_SRC = src/zopfli/blocksplitter.c src/zopfli/cache.c\
+                 src/zopfli/deflate.c src/zopfli/gzip_container.c\
+@@ -20,22 +22,22 @@
+
+ # Zopfli binary
+ zopfli:
+-	$(CC) $(ZOPFLILIB_SRC) $(ZOPFLIBIN_SRC) $(CFLAGS) -o zopfli
++	$(CC) $(ZOPFLILIB_SRC) $(ZOPFLIBIN_SRC) $(CFLAGS) $(LDFLAGS) -o zopfli
+
+ # Zopfli shared library
+ libzopfli:
+ 	$(CC) $(ZOPFLILIB_SRC) $(CFLAGS) -fPIC -c
+-	$(CC) $(ZOPFLILIB_OBJ) $(CFLAGS) -shared -Wl,-soname,libzopfli.so.1 -o libzopfli.so.1.0.1
++	$(CC) $(ZOPFLILIB_OBJ) $(CFLAGS) $(LDFLAGS) -shared -Wl,-soname,libzopfli.so.1 -o libzopfli.so.1.0.1
+
+ # ZopfliPNG binary
+ zopflipng:
+ 	$(CC) $(ZOPFLILIB_SRC) $(CFLAGS) -c
+-	$(CXX) $(ZOPFLILIB_OBJ) $(LODEPNG_SRC) $(ZOPFLIPNGLIB_SRC) $(ZOPFLIPNGBIN_SRC) $(CFLAGS) -o zopflipng
++	$(CXX) $(ZOPFLILIB_OBJ) $(LODEPNG_SRC) $(ZOPFLIPNGLIB_SRC) $(ZOPFLIPNGBIN_SRC) $(CFLAGS) $(LDFLAGS) -o zopflipng
+
+ # ZopfliPNG shared library
+ libzopflipng:
+ 	$(CC) $(ZOPFLILIB_SRC) $(CFLAGS) -fPIC -c
+-	$(CXX) $(ZOPFLILIB_OBJ) $(LODEPNG_SRC) $(ZOPFLIPNGLIB_SRC) $(CFLAGS) -fPIC --shared -Wl,-soname,libzopflipng.so.1 -o libzopflipng.so.1.0.0
++	$(CXX) $(ZOPFLILIB_OBJ) $(LODEPNG_SRC) $(ZOPFLIPNGLIB_SRC) $(CFLAGS) $(LDFLAGS) -fPIC --shared -Wl,-soname,libzopflipng.so.1 -o libzopflipng.so.1.0.0
+
+ # Remove all libraries and binaries
+ clean:

app-arch/zopfli/zopfli-1.0.1-r1.ebuild

@@ -0,0 +1,51 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+
+inherit toolchain-funcs
+
+DESCRIPTION="Very good, but slow, deflate or zlib compression"
+HOMEPAGE="https://github.com/google/zopfli/"
+SRC_URI="https://github.com/google/zopfli/archive/${P}.tar.gz"
+
+S="${WORKDIR}/${PN}-${P}"
+
+LICENSE="Apache-2.0"
+SLOT="0/1"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+
+DOCS=( CONTRIBUTORS README README.zopflipng )
+
+PATCHES=( "${FILESDIR}"/${P}-makefile.patch )
+
+# zopfli statically links libzopfli
+# zopflipng statically links libzopflipng
+# zopflipng also statically links an exact version of LodePNG (https://github.com/lvandeve/lodepng)
+# As of version 1.0.1 neither of the binaries
+# use the libraries we install. The libraries
+# exist solely for use by external programs.
+
+src_compile() {
+	tc-export CC CXX
+	emake libzopfli
+	emake zopfli
+
+	emake libzopflipng
+	emake zopflipng
+}
+
+# The Makefile has no install phase
+src_install() {
+	dolib.so libzopfli.so.${PV}
+	dosym libzopfli.so.${PV} /usr/$(get_libdir)/libzopfli.so.1
+
+	dobin ${PN}
+
+	# This version was erroneously not bumped to match ${PV}
+	dolib.so libzopflipng.so.1.0.0
+	dosym libzopflipng.so.1.0.0 /usr/$(get_libdir)/libzopflipng.so.1
+
+	dobin zopflipng
+}