Use this in addition to the C library features, not instead of, since the warnings do not cover the same cases as the C library extension, nor can it add run-time checks. This is on by default, but it’s recommended to enforce fixing issues with -Werror=fortify-source. The most reliable way to do this is by adding -D_FORTIFY_SOURCE=2 to your compiler flags.Ĭlang can also statically detect some of these issues by using -Wfortify-source (also new in r21).
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To enable, simply define _FORTIFY_SOURCE=2. If you’re using a build system other than ndk-build or CMake via the NDK’s toolchain file, this will not be enabled by default. In those cases, a run-time check will be used instead that will cause the program to abort rather than continue unsafely. It is not always possible for the compiler to detect this issue at compile-time. Test.cpp:10:18: error: 'strcpy' called with string bigger than buffer With fortify, the buffer overflow is diagnosed at compile-time:
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For example, without fortify the following code compiles fine:Ĭonst char src = "this string is too long" Fortify enables additional checks in the standard library that can help catch bugs sooner and mitigate security issues. Build system owners should check the updated Build System Maintainers guide.įortify is now enabled by default when using ndk-build or the CMake toolchain file (this includes ExternalNativeBuild users).
#Download android ndk driver
OpenMP is now available as a dynamic library (and this is the new default behavior, so link with -static-openmp if you want to stick with the static runtime).Ī handful of driver improvements have been made to reduce the amount of compiler configuration required by each build system as well. This includes fixes for quite a few bugs in the previous release, perhaps most importantly LLD no longer hangs when using multithreaded linking on Windows. The toolchain has been updated to r365631 (the master branch as of 10 July 2019). GDB has been updated to version 8.3, which includes fixes for debugging modern Intel CPUs.Īs always, we’ve updated LLVM and all of its components (Clang, lld, libc++, etc) which includes many improvements. This also includes a number of bug fixes, including fixing the pesky CreateProcess errors on Windows. This is enabled by default with ndk-build. We’ve updated GNU Make to version 4.2, which enables -output-sync to avoid interleaving output with error messages. There are quite a lot of new things in this release, resolving bugs and helping you write better, safer code. More detail, including the criteria we will use to determine what will be backported, what kinds of bugs will trigger a point release, and the bar we hold each release to can be found documented on our GitHub Wiki. If you want the latest features from Clang and libc++, this is the release for you. These will be approximately quarterly releases of our latest set of features, which will only be patched later for critical toolchain fixes. The non-LTS releases each year, which we call the “rolling” release, will be similar to our current process. Generally releasing in Q4, our first LTS release will be NDK r21. The release will undergo a longer beta cycle before being released, and will receive bug fixes as backports until next year’s LTS release. One release a year will be our Long Term Support (LTS) release for users that want stability more than they need new features. Linux users must have glibc 2.17 or newer. While this change will not affect most developers, this change does have an impact if you use 32-bit versions of Microsoft® Windows®.
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Following Android Studio and the SDK, 32-bit Windows is no longer supported. This release comes with new minimum system requirements. We have the usual toolchain updates, improved defaults for better security and performance, and are making changes to our release process to better accommodate users that need stability without hindering those that want new features. Posted by Dan Albert, Android NDK Tech LeadĪndroid NDK r21 is now in beta! It’s been a longer than usual development cycle (four months since NDK r20), so there’s quite a lot to discuss for this release.