Add an ENVVAR to append a suffix to the lib names.

Swift is expecting this libraries to be named `icuucswift` for Android to avoid name collision with Android's `icuuc`.

This should be temporal, a more appropriate solution (if any) should be applied to solve this lib conflict.

Author: gonzalolarralde

build.sh

@@ -159,14 +159,20 @@ cd $BUILDDIR/$ARCH
 
 cd $BUILDDIR/$ARCH
 
-[ -e libicuuc.a ] || {
+[ -e libicuuc$LIBSUFFIX.a ] || {
 
 	rm -rf icu
 
 	[ -e ../icu4c-55_1-src.tgz ] || exit 1
 
 	tar xvf ../icu4c-55_1-src.tgz
 
+	# The ENVVAR LIBSUFFIX should add the suffix only to the libname and not to the symbols.
+	# ToDo: Find the right way in Swift to refer to an alternative library with symbol prefixing or any other method to remove this.
+	if $[ -n "$LIBSUFFIX" ]; then
+		patch -p0 < ../patches/icu_suffix_only_on_libname.patch
+	fi
+
 	cd icu/source
 
 	#cp -f $BUILDDIR/config.sub .
@@ -189,6 +195,7 @@ cd $BUILDDIR/$ARCH
 		./configure \
 		--host=$GCCPREFIX \
 		--prefix=`pwd`/../../ \
+		--with-library-suffix=$LIBSUFFIX \
 		--with-cross-build=`pwd`/cross \
 		--enable-static --disable-shared \
 		|| exit 1
@@ -208,7 +215,7 @@ cd $BUILDDIR/$ARCH
 		$BUILDDIR/setCrossEnvironment-$ARCH.sh \
 		make V=1 install || exit 1
 
-	for f in libicudata libicutest libicui18n libicuio libicutu libicuuc; do
+	for f in libicudata$LIBSUFFIX libicutest$LIBSUFFIX libicui18n$LIBSUFFIX libicuio$LIBSUFFIX libicule$LIBSUFFIX libiculx$LIBSUFFIX libicutu$LIBSUFFIX libicuuc$LIBSUFFIX; do
 		#cp -f -H ../../lib/$f.so ../../
 		cp -f ../../lib/$f.a ../../
 		#$BUILDDIR/setCrossEnvironment-$ARCH.sh \

patches/icu_suffix_only_on_libname.patch

@@ -0,0 +1,18 @@
+--- icu/source/configure	2013-05-23 20:06:32.000000000 +0000
++++ icu/source/configure.patched	2018-02-21 23:35:25.934967613 +0000
+@@ -7217,14 +7217,7 @@
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $msg" >&5
+ $as_echo "$msg" >&6; }
+ 
+-if test "$ICULIBSUFFIX" != ""
+-then
+-    U_HAVE_LIB_SUFFIX=1
+-    ICULIBSUFFIXCNAME=`echo _$ICULIBSUFFIX | sed 's/^A-Za-z0-9_/_/g'`
+-    UCONFIG_CPPFLAGS="${UCONFIG_CPPFLAGS} -DU_HAVE_LIB_SUFFIX=1 -DU_LIB_SUFFIX_C_NAME=${ICULIBSUFFIXCNAME} "
+-else
+-    U_HAVE_LIB_SUFFIX=0
+-fi
++U_HAVE_LIB_SUFFIX=0
+ 
+ 
+