brotli: fix building of static libraries

Include a patch to make CMake honor the BUILD_SHARED_LIBS which
Buildroot sets to choose the kind of libraries to build.

Fixes:
- http://autobuild.buildroot.net/results/f1c4b5aeb12af7b7a3e8ae01c219004ecd9befd6/
- http://autobuild.buildroot.net/results/74d20ff38766466623cc4a9eb18afcda831bc20b/

Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/brotli/0001-CMake-Allow-using-BUILD_SHARED_LIBS-to-choose-static.patch

@@ -0,0 +1,144 @@
+From b60b613e7c2c9bf7a142c3c486ac6e77ad93f5d1 Mon Sep 17 00:00:00 2001
+From: Adrian Perez de Castro <aperez@igalia.com>
+Date: Mon, 26 Mar 2018 19:08:31 +0100
+Subject: [PATCH] CMake: Allow using BUILD_SHARED_LIBS to choose static/shared
+ libs
+
+By convention projects using CMake which can build either static or
+shared libraries use a BUILD_SHARED_LIBS flag to allow selecting between
+both: the add_library() command automatically switches between both using
+this variable when the library kind is not passed to add_library(). It
+is also usual to expose the BUILD_SHARED_LIBS as an user-facing setting
+with the option() command.
+
+This way, the following will both work as expected:
+
+   % cmake -DBUILD_SHARED_LIBS=OFF ...
+   % cmake -DBUILS_SHARED_LIBS=ON ...
+
+This is helpful for distributions which need (or want) to build only
+static libraries.
+---
+ CMakeLists.txt        | 42 ++++++++++++++----------------------------
+ c/fuzz/test_fuzzer.sh |  6 +++---
+ 2 files changed, 17 insertions(+), 31 deletions(-)
+
+Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
+Upstream-Status: Submitted [https://github.com/google/brotli/pull/655]
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 99b9258..3867931 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ cmake_minimum_required(VERSION 2.8.6)
+ 
+ project(brotli C)
+ 
++option(BUILD_SHARED_LIBS "Build shared libraries" ON)
++
+ # If Brotli is being bundled in another project, we don't want to
+ # install anything.  However, we want to let people override this, so
+ # we'll use the BROTLI_BUNDLED_MODE variable to let them do that; just
+@@ -114,10 +116,6 @@ set(BROTLI_LIBRARIES_CORE brotlienc brotlidec brotlicommon)
+ set(BROTLI_LIBRARIES ${BROTLI_LIBRARIES_CORE} ${LIBM_LIBRARY})
+ mark_as_advanced(BROTLI_LIBRARIES)
+ 
+-set(BROTLI_LIBRARIES_CORE_STATIC brotlienc-static brotlidec-static brotlicommon-static)
+-set(BROTLI_LIBRARIES_STATIC ${BROTLI_LIBRARIES_CORE_STATIC} ${LIBM_LIBRARY})
+-mark_as_advanced(BROTLI_LIBRARIES_STATIC)
+-
+ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+   add_definitions(-DOS_LINUX)
+ elseif(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
+@@ -137,24 +135,22 @@ endfunction()
+ transform_sources_list("scripts/sources.lst" "${CMAKE_CURRENT_BINARY_DIR}/sources.lst.cmake")
+ include("${CMAKE_CURRENT_BINARY_DIR}/sources.lst.cmake")
+ 
+-add_library(brotlicommon SHARED ${BROTLI_COMMON_C})
+-add_library(brotlidec SHARED ${BROTLI_DEC_C})
+-add_library(brotlienc SHARED ${BROTLI_ENC_C})
+-
+-add_library(brotlicommon-static STATIC ${BROTLI_COMMON_C})
+-add_library(brotlidec-static STATIC ${BROTLI_DEC_C})
+-add_library(brotlienc-static STATIC ${BROTLI_ENC_C})
++add_library(brotlicommon ${BROTLI_COMMON_C})
++add_library(brotlidec ${BROTLI_DEC_C})
++add_library(brotlienc ${BROTLI_ENC_C})
+ 
+ # Older CMake versions does not understand INCLUDE_DIRECTORIES property.
+ include_directories(${BROTLI_INCLUDE_DIRS})
+ 
++if(BUILD_SHARED_LIBS)
++  foreach(lib brotlicommon brotlidec brotlienc)
++    target_compile_definitions(${lib} PUBLIC "BROTLI_SHARED_COMPILATION" )
++    string(TOUPPER "${lib}" LIB)
++    set_target_properties (${lib} PROPERTIES DEFINE_SYMBOL "${LIB}_SHARED_COMPILATION" )
++  endforeach()
++endif()
++
+ foreach(lib brotlicommon brotlidec brotlienc)
+-  target_compile_definitions(${lib} PUBLIC "BROTLI_SHARED_COMPILATION" )
+-  string(TOUPPER "${lib}" LIB)
+-  set_target_properties (${lib} PROPERTIES DEFINE_SYMBOL "${LIB}_SHARED_COMPILATION" )
+-endforeach()
+-
+-foreach(lib brotlicommon brotlidec brotlienc brotlicommon-static brotlidec-static brotlienc-static)
+   target_link_libraries(${lib} ${LIBM_LIBRARY})
+   set_property(TARGET ${lib} APPEND PROPERTY INCLUDE_DIRECTORIES ${BROTLI_INCLUDE_DIRS})
+   set_target_properties(${lib} PROPERTIES
+@@ -167,9 +163,6 @@ endforeach()
+ target_link_libraries(brotlidec brotlicommon)
+ target_link_libraries(brotlienc brotlicommon)
+ 
+-target_link_libraries(brotlidec-static brotlicommon-static)
+-target_link_libraries(brotlienc-static brotlicommon-static)
+-
+ # For projects stuck on older versions of CMake, this will set the
+ # BROTLI_INCLUDE_DIRS and BROTLI_LIBRARIES variables so they still
+ # have a relatively easy way to use Brotli:
+@@ -183,7 +176,7 @@ endif()
+ 
+ # Build the brotli executable
+ add_executable(brotli ${BROTLI_CLI_C})
+-target_link_libraries(brotli ${BROTLI_LIBRARIES_STATIC})
++target_link_libraries(brotli ${BROTLI_LIBRARIES})
+ 
+ # Installation
+ if(NOT BROTLI_BUNDLED_MODE)
+@@ -199,13 +192,6 @@ if(NOT BROTLI_BUNDLED_MODE)
+     RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+   )
+ 
+-  install(
+-    TARGETS ${BROTLI_LIBRARIES_CORE_STATIC}
+-    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+-    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+-    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+-  )
+-
+   install(
+     DIRECTORY ${BROTLI_INCLUDE_DIRS}/brotli
+     DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+diff --git a/c/fuzz/test_fuzzer.sh b/c/fuzz/test_fuzzer.sh
+index 5c754e1..e85e12f 100755
+--- a/c/fuzz/test_fuzzer.sh
++++ b/c/fuzz/test_fuzzer.sh
+@@ -14,12 +14,12 @@ mkdir bin
+ cd bin
+ 
+ cmake $BROTLI -DCMAKE_C_COMPILER="$CC" -DCMAKE_CXX_COMPILER="$CXX" \
+-    -DBUILD_TESTING=OFF -DENABLE_SANITIZER=address
+-make -j$(nproc) brotlidec-static
++    -DBUILD_TESTING=OFF -DBUILD_SHARED_LIBS=OFF -DENABLE_SANITIZER=address
++make -j$(nproc) brotlidec
+ 
+ ${CXX} -o run_decode_fuzzer -std=c++11 -fsanitize=address -I$SRC/include \
+     $SRC/fuzz/decode_fuzzer.cc $SRC/fuzz/run_decode_fuzzer.cc \
+-    ./libbrotlidec-static.a ./libbrotlicommon-static.a
++    ./libbrotlidec.a ./libbrotlicommon.a
+ 
+ mkdir decode_corpora
+ unzip $BROTLI/java/org/brotli/integration/fuzz_data.zip -d decode_corpora
+-- 
+2.16.3
+