Add scripts for building for arm Android (#9961)

* Add scripts for building for arm Android

* Use arm soft float for bringup

* Use NDK r14

* Set HAVE_PT_REGS to false, as they are not available on Android

* _aligned_alloc is not available on clang

* Detect Visual C++ instead of clang

* Detect Android instead of clang

4 files changed, 196 insertions, 13 deletions

diff --git a/cross/android/arm/toolchain.cmake b/cross/android/arm/toolchain.cmake
new file mode 100644
index 0000000000..a7e1c73501
--- /dev/null
+++ b/cross/android/arm/toolchain.cmake
@@ -0,0 +1,41 @@
+set(CROSS_NDK_TOOLCHAIN $ENV{ROOTFS_DIR}/../)
+set(CROSS_ROOTFS ${CROSS_NDK_TOOLCHAIN}/sysroot)
+set(CLR_CMAKE_PLATFORM_ANDROID "Android")
+
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+
+## Specify the toolchain
+set(TOOLCHAIN "arm-linux-androideabi")
+set(CMAKE_PREFIX_PATH ${CROSS_NDK_TOOLCHAIN})
+set(TOOLCHAIN_PREFIX ${TOOLCHAIN}-)
+
+find_program(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}clang)
+find_program(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}clang++)
+find_program(CMAKE_ASM_COMPILER ${TOOLCHAIN_PREFIX}clang)
+find_program(CMAKE_AR ${TOOLCHAIN_PREFIX}ar)
+find_program(CMAKE_LD ${TOOLCHAIN_PREFIX}ar)
+find_program(CMAKE_OBJCOPY ${TOOLCHAIN_PREFIX}objcopy)
+find_program(CMAKE_OBJDUMP ${TOOLCHAIN_PREFIX}objdump)
+
+add_compile_options(--sysroot=${CROSS_ROOTFS})
+add_compile_options(-fPIE)
+add_compile_options(-mfloat-abi=soft)
+include_directories(SYSTEM ${CROSS_NDK_TOOLCHAIN}/include/c++/4.9.x/)
+include_directories(SYSTEM ${CROSS_NDK_TOOLCHAIN}/include/c++/4.9.x/arm-linux-androideabi/)
+
+set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} -B ${CROSS_ROOTFS}/usr/lib/gcc/${TOOLCHAIN}")
+set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} -L${CROSS_ROOTFS}/lib/${TOOLCHAIN}")
+set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} --sysroot=${CROSS_ROOTFS}")
+set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} -fPIE -pie")
+
+set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    ${CROSS_LINK_FLAGS}" CACHE STRING "" FORCE)
+set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CROSS_LINK_FLAGS}" CACHE STRING "" FORCE)
+set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${CROSS_LINK_FLAGS}" CACHE STRING "" FORCE)
+
+set(CMAKE_FIND_ROOT_PATH "${CROSS_ROOTFS}")
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
diff --git a/cross/android/arm/tryrun.cmake b/cross/android/arm/tryrun.cmake
new file mode 100644
index 0000000000..bcc2cd202c
--- /dev/null
+++ b/cross/android/arm/tryrun.cmake
@@ -0,0 +1,131 @@
+SET( HAVE_PT_REGS 
+     0
+     CACHE STRING "PT_SETREGS is not available on Android" FORCE)
+
+SET( HAVE_COMPATIBLE_EXP_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( REALPATH_SUPPORTS_NONEXISTENT_FILES_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( SSCANF_SUPPORT_ll_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( SSCANF_CANNOT_HANDLE_MISSING_EXPONENT_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_LARGE_SNPRINTF_SUPPORT_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_SCHED_GET_PRIORITY_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_WORKING_GETTIMEOFDAY_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_WORKING_CLOCK_GETTIME_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_CLOCK_MONOTONIC_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_MMAP_DEV_ZERO_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( ONE_SHARED_MAPPING_PER_FILEREGION_PER_PROCESS_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( PTHREAD_CREATE_MODIFIES_ERRNO_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( SEM_INIT_MODIFIES_ERRNO_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_COMPATIBLE_ACOS_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_COMPATIBLE_ASIN_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_COMPATIBLE_POW_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_VALID_NEGATIVE_INF_POW_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_VALID_POSITIVE_INF_POW_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_COMPATIBLE_ATAN2_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_COMPATIBLE_LOG_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_COMPATIBLE_LOG10_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( UNGETC_NOT_RETURN_EOF_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAS_POSIX_SEMAPHORES_EXITCODE 
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( GETPWUID_R_SETS_ERRNO_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( FILE_OPS_CHECK_FERROR_OF_PREVIOUS_CALL_EXITCODE 
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_SCHED_GETCPU_EXITCODE
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_CLOCK_THREAD_CPUTIME_EXITCODE
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_CLOCK_MONOTONIC_COARSE_EXITCODE
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_PROCFS_CTL_EXITCODE
+     1
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_PROCFS_MAPS_EXITCODE
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_PROCFS_STAT_EXITCODE
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
+
+SET( HAVE_PROCFS_STATUS_EXITCODE
+     0
+     CACHE STRING "Result from TRY_RUN" FORCE)
diff --git a/cross/android/arm64/tryrun.cmake b/cross/android/arm64/tryrun.cmake
index 1bf42e4dca..f32065a3bc 100644
--- a/cross/android/arm64/tryrun.cmake
+++ b/cross/android/arm64/tryrun.cmake
@@ -1,4 +1,3 @@
-# Need to verify this
 SET( HAVE_COMPATIBLE_EXP_EXITCODE 
      1
      CACHE STRING "Result from TRY_RUN" FORCE)
diff --git a/cross/build-android-rootfs.sh b/cross/build-android-rootfs.sh
index 2e9cb0b363..23ca1d9384 100755
--- a/cross/build-android-rootfs.sh
+++ b/cross/build-android-rootfs.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+__NDK_Version=r14
 
 usage()
 {
@@ -12,7 +13,7 @@ usage()
     echo "By default, the toolchain and sysroot will be generated in cross/android-rootfs/toolchain/[BuildArch]. You can change this behavior"
     echo "by setting the TOOLCHAIN_DIR environment variable"
     echo.
-    echo "By default, the NDK will be downloaded into the cross/android-rootfs/android-ndk-r13b directory. If you already have an NDK installation,"
+    echo "By default, the NDK will be downloaded into the cross/android-rootfs/android-ndk-$__NDK_Version directory. If you already have an NDK installation,"
     echo "you can set the NDK_DIR environment variable to have this script use that installation of the NDK."
     exit 1
 }
@@ -20,6 +21,7 @@ usage()
 __ApiLevel=21 # The minimum platform for arm64 is API level 21
 __BuildArch=arm64
 __AndroidArch=aarch64
+__AndroidToolchain=aarch64-linux-android
 
 for i in "$@"
     do
@@ -32,6 +34,12 @@ for i in "$@"
         arm64)
             __BuildArch=arm64
             __AndroidArch=aarch64
+            __AndroidToolchain=aarch64-linux-android
+            ;;
+        arm)
+            __BuildArch=arm
+            __AndroidArch=arm
+            __AndroidToolchain=arm-linux-androideabi
             ;;
         *[0-9])
             __ApiLevel=$i
@@ -46,7 +54,7 @@ done
 __CrossDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 __Android_Cross_Dir="$__CrossDir/android-rootfs"
-__NDK_Dir="$__Android_Cross_Dir/android-ndk-r13b"
+__NDK_Dir="$__Android_Cross_Dir/android-ndk-$__NDK_Version"
 __libunwind_Dir="$__Android_Cross_Dir/libunwind"
 __lldb_Dir="$__Android_Cross_Dir/lldb"
 __ToolchainDir="$__Android_Cross_Dir/toolchain/$__BuildArch"
@@ -68,8 +76,8 @@ echo "Target Toolchain location: $__ToolchainDir"
 if [ ! -d $__NDK_Dir ]; then
     echo Downloading the NDK into $__NDK_Dir
     mkdir -p $__NDK_Dir
-    wget -nv -nc --show-progress https://dl.google.com/android/repository/android-ndk-r13b-linux-x86_64.zip -O $__Android_Cross_Dir/android-ndk-r13b-linux-x86_64.zip
-    unzip -q $__Android_Cross_Dir/android-ndk-r13b-linux-x86_64.zip -d $__Android_Cross_Dir
+    wget -nv -nc --show-progress https://dl.google.com/android/repository/android-ndk-$__NDK_Version-linux-x86_64.zip -O $__Android_Cross_Dir/android-ndk-$__NDK_Version-linux-x86_64.zip
+    unzip -q $__Android_Cross_Dir/android-ndk-$__NDK_Version-linux-x86_64.zip -d $__Android_Cross_Dir
 fi
 
 if [ ! -d $__lldb_Dir ]; then
@@ -93,16 +101,21 @@ mkdir -p $__Android_Cross_Dir/deb/
 mkdir -p $__Android_Cross_Dir/tmp/$arch/
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libicu_58.2_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libicu_58.2_$__AndroidArch.deb
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libicu-dev_58.2_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libicu-dev_58.2_$__AndroidArch.deb
-wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libuuid-dev_1.0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libuuid-dev_1.0.3_$__AndroidArch.deb
-wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libuuid_1.0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libuuid_1.0.3_$__AndroidArch.deb
+
+if [ "$__AndroidArch" == "arm" ]; then
+    wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libuuid-dev-1.0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libuuid-dev_1.0.3_$__AndroidArch.deb
+    wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libuuid-1.0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libuuid_1.0.3_$__AndroidArch.deb
+else
+    wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libuuid-dev_1.0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libuuid-dev_1.0.3_$__AndroidArch.deb
+    wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libuuid_1.0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libuuid_1.0.3_$__AndroidArch.deb
+fi
+
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libandroid-glob-dev_0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libandroid-glob-dev_0.3_$__AndroidArch.deb
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libandroid-glob_0.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libandroid-glob_0.3_$__AndroidArch.deb
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libandroid-support-dev_13.10_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libandroid-support-dev_13.10_$__AndroidArch.deb
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libandroid-support_13.10_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libandroid-support_13.10_$__AndroidArch.deb
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/liblzma-dev_5.2.3_$__AndroidArch.deb  -O $__Android_Cross_Dir/deb/liblzma-dev_5.2.3_$__AndroidArch.deb
 wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/liblzma_5.2.3_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/liblzma_5.2.3_$__AndroidArch.deb
-wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libcurl-dev_7.52.1_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libcurl-dev_7.52.1_$__AndroidArch.deb
-wget -nv -nc http://termux.net/dists/stable/main/binary-$__AndroidArch/libcurl_7.52.1_$__AndroidArch.deb -O $__Android_Cross_Dir/deb/libcurl_7.52.1_$__AndroidArch.deb
 
 echo Unpacking Termux packages
 dpkg -x $__Android_Cross_Dir/deb/libicu_58.2_$__AndroidArch.deb $__Android_Cross_Dir/tmp/$__AndroidArch/
@@ -115,8 +128,6 @@ dpkg -x $__Android_Cross_Dir/deb/libandroid-support-dev_13.10_$__AndroidArch.deb
 dpkg -x $__Android_Cross_Dir/deb/libandroid-support_13.10_$__AndroidArch.deb $__Android_Cross_Dir/tmp/$__AndroidArch/
 dpkg -x $__Android_Cross_Dir/deb/liblzma-dev_5.2.3_$__AndroidArch.deb $__Android_Cross_Dir/tmp/$__AndroidArch/
 dpkg -x $__Android_Cross_Dir/deb/liblzma_5.2.3_$__AndroidArch.deb $__Android_Cross_Dir/tmp/$__AndroidArch/
-dpkg -x $__Android_Cross_Dir/deb/libcurl-dev_7.52.1_$__AndroidArch.deb $__Android_Cross_Dir/tmp/$__AndroidArch/
-dpkg -x $__Android_Cross_Dir/deb/libcurl_7.52.1_$__AndroidArch.deb $__Android_Cross_Dir/tmp/$__AndroidArch/
 
 cp -R $__Android_Cross_Dir/tmp/$__AndroidArch/data/data/com.termux/files/usr/* $__ToolchainDir/sysroot/usr/
 
@@ -138,7 +149,8 @@ git clean -xfd
 # libunwind is available on Android, but not included in the NDK.
 echo Building libunwind
 autoreconf --force -v --install 2> /dev/null
-./configure CC=$__ToolchainDir/bin/$__AndroidArch-linux-android-clang --with-sysroot=$__ToolchainDir/sysroot --host=$__AndroidArch-eabi --target=$__AndroidArch-eabi --disable-tests --disable-coredump --prefix=$__ToolchainDir/sysroot/usr 2> /dev/null
+echo ./configure CC=$__ToolchainDir/bin/$__AndroidToolchain-clang --with-sysroot=$__ToolchainDir/sysroot --host=$__AndroidArch-eabi --target=$__AndroidArch-eabi --disable-tests --disable-coredump --prefix=$__ToolchainDir/sysroot/usr 2> /dev/null
+./configure CC=$__ToolchainDir/bin/$__AndroidToolchain-clang --with-sysroot=$__ToolchainDir/sysroot --host=$__AndroidArch-eabi --target=$__AndroidArch-eabi --disable-tests --disable-coredump --prefix=$__ToolchainDir/sysroot/usr 2> /dev/null
 make > /dev/null
 make install > /dev/null
 
@@ -146,5 +158,5 @@ make install > /dev/null
 cp include/libunwind.h $__ToolchainDir/sysroot/usr/include/
 
 echo Now run:
-echo CONFIG_DIR=\`realpath cross/android/arm64\` ROOTFS_DIR=\`realpath $__ToolchainDir/sysroot\` ./build.sh cross arm64 skipgenerateversion skipnuget cmakeargs -DENABLE_LLDBPLUGIN=0
+echo CONFIG_DIR=\`realpath cross/android/$__BuildArch\` ROOTFS_DIR=\`realpath $__ToolchainDir/sysroot\` ./build.sh cross $__BuildArch skipgenerateversion skipnuget cmakeargs -DENABLE_LLDBPLUGIN=0