Add an option to avoid building shared libraries. (#766)

Add an option to avoid building shared libraries (for building with EMCC)

Drive-by:
* maven: ramp up java level to minimal required
* travis: replace deprecated clang-5.0 with clang-7
* maven: fallback to jdk10 to void javadoc bug

3 files changed, 36 insertions, 23 deletions

diff --git a/.travis.yml b/.travis.yml
index 5cfeafc..930bd63 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,27 +44,27 @@ matrix:
     ## Test that fuzzer is compiling / working.
     ###
     - os: linux
-      env: BUILD_SYSTEM=fuzz C_COMPILER=clang-5.0 CXX_COMPILER=clang++-5.0 ASAN_OPTIONS=detect_leaks=0
+      env: BUILD_SYSTEM=fuzz C_COMPILER=clang-7 CXX_COMPILER=clang++-7 ASAN_OPTIONS=detect_leaks=0
       addons:
         apt:
           sources:
           - ubuntu-toolchain-r-test
-          - llvm-toolchain-trusty-5.0
+          - llvm-toolchain-xenial-7
           packages:
-          - clang-5.0
+          - clang-7
 
     ###
     ## clang on Linux
     ###
     - os: linux
-      env: BUILD_SYSTEM=cmake C_COMPILER=clang-5.0 CXX_COMPILER=clang++-5.0
+      env: BUILD_SYSTEM=cmake C_COMPILER=clang-7 CXX_COMPILER=clang++-7
       addons:
         apt:
           sources:
-          - llvm-toolchain-trusty-5.0
+          - llvm-toolchain-xenial-7
           - ubuntu-toolchain-r-test
           packages:
-          - clang-5.0
+          - clang-7
     - os: linux
       env: BUILD_SYSTEM=cmake C_COMPILER=clang-3.5 CXX_COMPILER=clang++-3.5
       addons:
@@ -145,35 +145,38 @@ matrix:
     ## Sanitizers
     ###
     - os: linux
-      env: BUILD_SYSTEM=cmake C_COMPILER=clang-5.0 CXX_COMPILER=clang++-5.0 SANITIZER=address ASAN_OPTIONS=detect_leaks=0
+      env: BUILD_SYSTEM=cmake C_COMPILER=clang-7 CXX_COMPILER=clang++-7 SANITIZER=address ASAN_OPTIONS=detect_leaks=0
       addons:
         apt:
           sources:
           - ubuntu-toolchain-r-test
-          - llvm-toolchain-trusty-5.0
+          - llvm-toolchain-xenial-7
           packages:
-          - clang-5.0
+          - clang-7
     - os: linux
-      env: BUILD_SYSTEM=cmake C_COMPILER=clang-5.0 CXX_COMPILER=clang++-5.0 SANITIZER=thread
+      env: BUILD_SYSTEM=cmake C_COMPILER=clang-7 CXX_COMPILER=clang++-7 SANITIZER=thread
       addons:
         apt:
           sources:
           - ubuntu-toolchain-r-test
-          - llvm-toolchain-trusty-5.0
+          - llvm-toolchain-xenial-7
           packages:
-          - clang-5.0
+          - clang-7
     - os: linux
-      env: BUILD_SYSTEM=cmake C_COMPILER=clang-5.0 CXX_COMPILER=clang++-5.0 SANITIZER=undefined CFLAGS="-fno-sanitize-recover=undefined,integer"
+      env: BUILD_SYSTEM=cmake C_COMPILER=clang-7 CXX_COMPILER=clang++-7 SANITIZER=undefined CFLAGS="-fno-sanitize-recover=undefined,integer"
       addons:
         apt:
           sources:
           - ubuntu-toolchain-r-test
-          - llvm-toolchain-trusty-5.0
+          - llvm-toolchain-xenial-7
           packages:
-          - clang-5.0
+          - clang-7
 
     - os: linux
       env: BUILD_SYSTEM=maven
+      jdk:
+      # maven + jdk11 + javadoc == trouble
+      - openjdk10
       language: java
 
     - os: linux
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc45f80..3427802 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,8 @@ cmake_minimum_required(VERSION 2.8.6)
 
 project(brotli C)
 
+option(BROTLI_DISABLE_SHARED "do not build shared libraries")
+
 # 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
@@ -137,10 +139,16 @@ 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})
+if(BROTLI_DISABLE_SHARED)
+  set(BROTLI_SHARED_LIBS "")
+else()
+  set(BROTLI_SHARED_LIBS brotlicommon brotlidec brotlienc)
+  add_library(brotlicommon SHARED ${BROTLI_COMMON_C})
+  add_library(brotlidec SHARED ${BROTLI_DEC_C})
+  add_library(brotlienc SHARED ${BROTLI_ENC_C})
+endif()
 
+set(BROTLI_STATIC_LIBS brotlicommon-static brotlidec-static brotlienc-static)
 add_library(brotlicommon-static STATIC ${BROTLI_COMMON_C})
 add_library(brotlidec-static STATIC ${BROTLI_DEC_C})
 add_library(brotlienc-static STATIC ${BROTLI_ENC_C})
@@ -148,13 +156,13 @@ add_library(brotlienc-static STATIC ${BROTLI_ENC_C})
 # Older CMake versions does not understand INCLUDE_DIRECTORIES property.
 include_directories(${BROTLI_INCLUDE_DIRS})
 
-foreach(lib brotlicommon brotlidec brotlienc)
+foreach(lib IN LISTS BROTLI_SHARED_LIBS)
   target_compile_definitions(${lib} PUBLIC "BROTLI_SHARED_COMPILATION" )
   string(TOUPPER "${lib}" LIB)
-  set_target_properties (${lib} PROPERTIES DEFINE_SYMBOL "${LIB}_SHARED_COMPILATION" )
+  set_target_properties (${lib} PROPERTIES DEFINE_SYMBOL "${LIB}_SHARED_COMPILATION")
 endforeach()
 
-foreach(lib brotlicommon brotlidec brotlienc brotlicommon-static brotlidec-static brotlienc-static)
+foreach(lib IN LISTS BROTLI_SHARED_LIBS BROTLI_STATIC_LIBS)
   target_link_libraries(${lib} ${LIBM_LIBRARY})
   set_property(TARGET ${lib} APPEND PROPERTY INCLUDE_DIRECTORIES ${BROTLI_INCLUDE_DIRS})
   set_target_properties(${lib} PROPERTIES
@@ -164,8 +172,10 @@ foreach(lib brotlicommon brotlidec brotlienc brotlicommon-static brotlidec-stati
   set_property(TARGET ${lib} APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${BROTLI_INCLUDE_DIRS}")
 endforeach()
 
+if(NOT BROTLI_DISABLE_SHARED)
 target_link_libraries(brotlidec brotlicommon)
 target_link_libraries(brotlienc brotlicommon)
+endif()
 
 target_link_libraries(brotlidec-static brotlicommon-static)
 target_link_libraries(brotlienc-static brotlicommon-static)
diff --git a/java/org/brotli/pom.xml b/java/org/brotli/pom.xml
index bb4a5a3..9a7abd0 100644
--- a/java/org/brotli/pom.xml
+++ b/java/org/brotli/pom.xml
@@ -80,8 +80,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.1</version>
         <configuration>
-          <source>1.5</source>
-          <target>1.5</target>
+          <source>1.6</source>
+          <target>1.6</target>
         </configuration>
       </plugin>
       <plugin>