Important changes:

• Integrated the workaround for Cortex-A53 Erratum 843419 into the aarch64-linux-android-4.9 linker. For more information on this workaround, see Workaround for cortex-a53 erratum 843419.

• Added Clang 3.6; NDK_TOOLCHAIN_VERSION=clang now picks that version of Clang by default.

• Removed Clang 3.4.

• Removed GCC 4.6.

• Implemented multithreading support in ld.gold for all architectures. It can now link with or without support for multithreading; the default is to do it without.

• To compile with multithreading, use the --threads option.

• To compile without multithreading, use the --no-threads option.

• Upgraded GDB/gdbserver to 7.7 for all architectures.

• Removed the NDK package for 32-bit Darwin.

• Important bug fixes:

• • Fixed a crash that occurred when there were OpenMP loops outside of the main thread.

  • Fixed a GCC 4.9 internal compiler error (ICE) that occured when the user declared #pragma GCC optimize ("O0"), but had a different level of optimization specified on the command line. The pragma takes precedence.

  • Fixed an error that used to produce a crash with the following error message:

    in add_stores, at var-tracking.c:6000

  • Implemented a workaround for a Clang 3.5 issue in which LLVM auto-vectorization generatesllvm.cttz.v2i64(), an instruction with no counterpart in the ARM instruction set.

• Other bug fixes:

• • Made the following header and library fixes:

  • Fixed PROPERTY_* in media/NdkMediaDrm.h.

  • Fixed sys/ucontext.h for mips64.

  • Dropped the Clang version check for __builtin_isnan and __builtin_isinf.

  • Added android-21/arch-mips/usr/include/asm/reg.h and android-21/arch-mips64/usr/include/asm/reg.h.

  • Fixed a spurious array-bounds warning that GCC 4.9 produced for x86, and reenabled the array bounds warning that GCC 4.9 had produced for ARM. The warning for ARM had previously been unconditionally disabled.

  • Fixed Clang 3.5 for mips and mips64 to create a writable .gcc_except_table section, thus matching GCC behavior. This change allows you to avoid the following linker warning:

    .../ld: warning: creating a DT_TEXTREL in a shared object

  • Backported a fix for compiler-rt issues that were causing crashes when Clang compiled for mips64. For more information, see LLVM Issue 20098.

  • Fixed Clang 3.5 crashes that occurred on non-ASCII comments. (Issue 81440)

  • Fixed stlport collate::compare to return -1 and 1. Previously, it had returned arbitrary signed numbers.

  • Fixed ndk-gdb for 64-bit ABIs. (Issue 118300)

  • Fixed the crash that the HelloComputeNDK sample for RenderScript was producing on Android 4.4 (Android API level 19). For more information, see this page.

  • Fixed libc++ __wrap_iter for GCC. For more information, see LLVM Issue 22355.

  • Fixed .asm support for ABI x86_64.

  • Implemented a workaround for the GCC 4.8 stlport issue. (Issue 127773)

  • Removed the trailing directory separator \\ from the project path in Windows. (Issue 160584)

  • Fixed a no rule to make target error that occurred when compiling a single .c file by executing the ndk-build.cmd command from gradle. (Issue 66937)

  • Added the libatomic.a and libgomp.a libraries that had been missing from the following host toolchains:

  • aarch64-linux-android-4.9

  • mips64el-linux-android-4.9

  • mipsel-linux-android-4.9

  • x86_64-4.9

• Other changes:

• • Added ld.gold for aarch64. The default linker remains ld.bfd. To explicitly enable ld.gold, add -fuse-ld=gold to the LOCAL_LDFLAGS or APP_LDFLAGS variable.

  • Built the MIPS and MIPS64 toolchains with binutils-2.25, which provides improved R6 support.

  • Made -fstandalone-debug (full debug info) a default option for Clang.

  • Replaced -fstack-protector with -fstack-protector-strong for the ARM, AArch64, X86, and X86_64 toolchains for GCC 4.9, Clang 3.5, and Clang 3.6.

  • Added the --package command-line switch to ndk-gdb to allow the build system to override the package name. (Issue 56189)

  • Deprecated -mno-ldc1-stc1 for MIPS. This option may not work with the new -fpxx and -mno-odd-spreg options, or with the FPXX ABI.

  • Added MIPS MSA and R6 detection to cpu-features.