WIP - Add ARM job to Travis-CI

.travis.yml

@@ -10,6 +10,17 @@ env:
 
 matrix:
   include:
+    - name: "Ubuntu 16.04 - gcc-5.4 (Release) - ARM"
+      os: linux
+      arch: arm64
+      dist: xenial
+      sudo: required
+      compiler: gcc
+      env:
+        - BUILD_TYPE="Release"
+        - CONAN_WEBREADY_DISABLED=1
+        - COMMON_CMAKE_OPTIONS="-DEXIV2_ENABLE_WEBREADY=OFF -DEXIV2_ENABLE_CURL=OFF -DEXIV2_BUILD_UNIT_TESTS=ON -DEXIV2_TEAM_WARNINGS_AS_ERRORS=ON -DCMAKE_INSTALL_PREFIX=install"
+
     - name: "Ubuntu 16.04 - gcc-5.4 (Release)"
       os: linux
       dist: xenial

ci/run.sh

@@ -24,7 +24,14 @@ fi
 source conan/bin/activate
 
 mkdir build && cd build
-conan install .. -o webready=True --build missing
+if [ -n "$CONAN_WEBREADY_DISABLED" ]; then
+  conan install .. -o webready=False --build missing
+else
+  conan install .. -o webready=True  --build missing
+fi
+
+cmake --version
+gcc --version
 
 cmake ${CMAKE_OPTIONS} ..
 make -j2

cmake/compilerFlags.cmake

@@ -40,12 +40,15 @@ if ( MINGW OR UNIX OR MSYS ) # MINGW, Linux, APPLE, CYGWIN
             endif()
         endif()
 
-        add_compile_options(-Wp,-D_GLIBCXX_ASSERTIONS)
+        if (NOT MINGW)
+            add_compile_options(-Wp,-D_GLIBCXX_ASSERTIONS)
 
-        if (CMAKE_BUILD_TYPE STREQUAL Release AND NOT APPLE)
-            add_compile_options(-Wp,-D_FORTIFY_SOURCE=2) # Requires to compile with -O2
+            if (CMAKE_BUILD_TYPE STREQUAL Release AND NOT APPLE)
+                add_compile_options(-Wp,-D_FORTIFY_SOURCE=2) # Requires to compile with -O2
+            endif()
         endif()
 
+
         if(BUILD_WITH_COVERAGE)
             add_compile_options(--coverage)
             # TODO: From CMake 3.13 we could use add_link_options instead these 2 lines

cmake/linux-mingw64.cmake

@@ -0,0 +1,21 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+
+# cross compilers to use for C and C++
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc-posix)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++-posix)
+set(CMAKE_Fortran_COMPILER ${TOOLCHAIN_PREFIX}-gfortran)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+set(CMAKE_CXX_FLAGS "-fno-stack-protector")
+
+# target environment on the build host system
+#   set 1st to dir with the cross compiler's C/C++ headers/libs
+#set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX})
+#set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+
+# modify default behavior of FIND_XXX() commands to
+# search for headers/libs in the target environment and
+# search for programs in the build host environment
+#set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+#set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+#set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

notesOnCrossCompiling.txt

@@ -0,0 +1,56 @@
+Conan Profile for linux_to_win64
+
+luis@ryzenLinux:~/.conan/profiles$ cat linux_to_win64 
+        toolchain=/usr/x86_64-w64-mingw32 # Adjust this path
+        target_host=x86_64-w64-mingw32
+        cc_compiler=gcc
+        cxx_compiler=g++
+
+        [env]
+        CONAN_CMAKE_FIND_ROOT_PATH=$toolchain
+        CHOST=$target_host
+        AR=$target_host-ar
+        AS=$target_host-as
+        RANLIB=$target_host-ranlib
+        CC=$target_host-$cc_compiler
+        CXX=$target_host-$cxx_compiler
+        STRIP=$target_host-strip
+        RC=$target_host-windres
+
+        [settings]
+        # We are cross-building to Windows
+        os=Windows
+        arch=x86_64
+        compiler=gcc
+
+        # Adjust to the gcc version of your MinGW package
+        compiler.version=9.3
+        compiler.libcxx=libstdc++11
+        build_type=Release
+
+CMake Toolchain file:
+        set(CMAKE_SYSTEM_NAME Windows)
+        set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+        set(CMAKE_SYSROOT /usr/lib/gcc/x86_64-w64-mingw32/9.3-posix)
+
+        set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+        set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+        set(CMAKE_Fortran_COMPILER ${TOOLCHAIN_PREFIX}-gfortran)
+        set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+
+
+For configuring and building on mingw
+
+conan install --build missing --profile linux_to_win64 ../
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=../cmake/linux-mingw64.cmake -DBUILD_SHARED_LIBS=OFF ../
+
+It is possible to build the library and all the applications if the exiv2lib is STATIC
+(-DBUILD_SHARED_LIBS=OFF). However, when building the SHARED library we get this linking error:
+
+[ 56%] Linking CXX executable ../bin/exiv2.exe
+/usr/bin/x86_64-w64-mingw32-ld: CMakeFiles/exiv2.dir/objects.a(params.cpp.obj):params.cpp:(.text$_ZN5Exiv210BasicErrorIcEC1INSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEENS_9ErrorCodeERKT_[_ZN5Exiv210BasicErrorIcEC1INSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEENS_9ErrorCodeERKT_]+0x95): undefined reference to `__imp__ZN5Exiv210BasicErrorIcE6setMsgEv'
+collect2: error: ld returned 1 exit status
+
+As discussed in the following link, we have to deal with the BasicError::setMsg monster:
+https://github.com/Exiv2/exiv2/issues/663

xmpsdk/include/XMP_Environment.h

@@ -44,9 +44,15 @@
 #elif defined macintosh || defined MACOS_CLASSIC || defined MACOS_X_UNIX || defined MACOS_X || defined MACOS || defined(__APPLE__)
 # define MAC_ENV 1
 #else
+
+#ifdef __MINGW32__
+# define WIN_ENV 1
+#else
 # define UNIX_ENV 1
 #endif
 
+#endif
+
 // ! Tempting though it might be to have a standard macro for big or little endian, there seems to
 // ! be no decent way to do that on our own in UNIX. Forcing it on the client isn't acceptable.