From 7fdcabd80c823694d190e5baa8c657ffcae5e777 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Fri, 31 Jan 2020 17:14:11 +0100
Subject: [PATCH] cmake/FindLibMagic.cmake: fix static linking

libmagic can optionally depends on xz (for lzma) or bzip2 since version
5.38 and
https://github.com/file/file/commit/b259a07ea95827f565faa20f0316e5b2704064f7
so use pkg-config to retrieve those static dependencies and avoid the
following build failure:

[100%] Linking CXX executable gerbera
/home/br-user/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: /home/br-user/autobuild/run/instance-0/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libmagic.a(compress.o): in function `uncompressbuf':
compress.c:(.text+0x69c): undefined reference to `BZ2_bzDecompressInit'
/home/br-user/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: compress.c:(.text+0x710): undefined reference to `BZ2_bzDecompress'
/home/br-user/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: compress.c:(.text+0x730): undefined reference to `BZ2_bzDecompressEnd'
/home/br-user/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: compress.c:(.text+0x7bc): undefined reference to `lzma_auto_decoder'
/home/br-user/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: compress.c:(.text+0x828): undefined reference to `lzma_code'
/home/br-user/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: compress.c:(.text+0x848): undefined reference to `lzma_end'

It should be noted that libmagic.pc is not currently provided in the
official file package (which provides libmagic), an issue has been
opened to add libmagic.pc: https://bugs.astron.com/view.php?id=136

Fixes:
 - http://autobuild.buildroot.org/results/37b1ef54dc41100689f311fbc31fc9300dc6ae63

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from:
https://github.com/gerbera/gerbera/commit/7fdcabd80c823694d190e5baa8c657ffcae5e777]
---
 cmake/FindLibMagic.cmake | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/cmake/FindLibMagic.cmake b/cmake/FindLibMagic.cmake
index f68ab923..04995af4 100644
--- a/cmake/FindLibMagic.cmake
+++ b/cmake/FindLibMagic.cmake
@@ -1,11 +1,22 @@
 INCLUDE (FindPackageHandleStandardArgs)
 
-FIND_PATH(MAGIC_INCLUDE_DIR magic.h)
-FIND_LIBRARY(MAGIC_LIBRARIES NAMES magic)
+find_package(PkgConfig QUIET)
+
+pkg_check_modules(PC_MAGIC QUIET libmagic)
+
+FIND_PATH(MAGIC_INCLUDE_DIR magic.h
+    HINTS ${PC_MAGIC_INCLUDEDIR} ${PC_MAGIC_INCLUDE_DIRS})
+FIND_LIBRARY(MAGIC_LIBRARIES NAMES magic
+    HINTS ${PC_MAGIC_LIBDIR} ${PC_MAGIC_LIBRARY_DIRS})
 
 # handle the QUIETLY and REQUIRED arguments and set MAGIC_FOUND to TRUE
 find_package_handle_standard_args(MAGIC DEFAULT_MSG MAGIC_LIBRARIES)
 
+if (MAGIC_FOUND)
+    set (MAGIC_LIBRARIES ${MAGIC_LIBRARY} ${PC_MAGIC_LIBRARIES})
+    set (MAGIC_INCLUDE_DIRS ${MAGIC_INCLUDE_DIR} )
+endif ()
+
 MARK_AS_ADVANCED(
     MAGIC_LIBRARIES
     MAGIC_INCLUDE_DIRS )