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

3 files changed, 172 insertions, 1 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)