package/lcms2: fix static building with tiff

Strangely enough, we have only one build failure on the autobuilder even
if lcms2 never used pkg-config to retrieve static dependencies of tiff
(which also depends on xz since 2016)

Fixes:
 - http://autobuild.buildroot.org/results/07c5ca780bcdbfcd7cad6502345f1553ce17bdc3

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/lcms2/0001-configure.ac-fix-static-linking-with-tiff.patch

@@ -0,0 +1,37 @@
+From 49eed94b8a1d3fda2d00f0120e14c4d78cc5e840 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Fri, 12 Feb 2021 09:28:39 +0100
+Subject: [PATCH] configure.ac: fix static linking with tiff
+
+Use pkg-config to retrieve the dependencies of tiff (e.g. xz) to fix
+the following static build failure:
+
+libtool: link: /home/buildroot/autobuild/run/instance-2/output-1/host/bin/xtensa-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -mlongcalls -mauto-litpools -Os -static -fvisibility=hidden -static -static -o tificc tificc.o ../common/xgetopt.o ../common/vprf.o  ../../src/.libs/liblcms2.a -ltiff -ljpeg -lz -lm -lpthread
+/home/buildroot/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/xtensa-buildroot-linux-uclibc/9.3.0/../../../../xtensa-buildroot-linux-uclibc/bin/ld: /home/buildroot/autobuild/run/instance-2/output-1/host/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libtiff.a(tif_lzma.o): in function `LZMAEncode':
+tif_lzma.c:(.text+0x168): undefined reference to `lzma_code'
+
+Fixes:
+ - http://autobuild.buildroot.org/results/07c5ca780bcdbfcd7cad6502345f1553ce17bdc3
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/mm2/Little-CMS/pull/244]
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index b3c8f2b..96440fe 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -330,7 +330,7 @@ then
+ 	AC_MSG_RESULT(no -- some components failed test)
+ 	have_tiff='no (failed tests)'
+     else
+-	LIB_TIFF='-ltiff'
++	PKG_CHECK_MODULES(PC_TIFF,libtiff-4,LIB_TIFF=$PC_TIFF_LIBS,LIB_TIFF='-ltiff')
+ 	LIBS="$LIB_TIFF $LIBS"
+ 	AC_DEFINE(HasTIFF,1,Define if you have TIFF library)
+ 	AC_MSG_RESULT(yes)
+-- 
+2.29.2
+

package/lcms2/lcms2.mk

@@ -11,6 +11,8 @@ LCMS2_LICENSE_FILES = COPYING
 LCMS2_CPE_ID_VENDOR = littlecms
 LCMS2_CPE_ID_PRODUCT = little_cms
 LCMS2_INSTALL_STAGING = YES
+# We're patching configure.ac
+LCMS2_AUTORECONF = YES
 
 ifeq ($(BR2_PACKAGE_JPEG),y)
 LCMS2_CONF_OPTS += --with-jpeg
@@ -21,7 +23,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_TIFF),y)
 LCMS2_CONF_OPTS += --with-tiff
-LCMS2_DEPENDENCIES += tiff
+LCMS2_DEPENDENCIES += host-pkgconf tiff
 else
 LCMS2_CONF_OPTS += --without-tiff
 endif