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Diffstat (limited to 'SConstruct')
| -rw-r--r-- | SConstruct | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/SConstruct b/SConstruct index d76ccfab807..041967fc278 100644 --- a/SConstruct +++ b/SConstruct @@ -2957,6 +2957,50 @@ def doConfigure(myenv): if not check_all_atomics(' with libatomic'): myenv.ConfError("The toolchain does not support std::atomic, cannot continue") + def CheckExtendedAlignment(context, size): + test_body = """ + #include <atomic> + #include <mutex> + #include <cstddef> + + static_assert(alignof(std::max_align_t) < {0}, "whatever"); + + alignas({0}) std::mutex aligned_mutex; + alignas({0}) std::atomic<int> aligned_atomic; + + struct alignas({0}) aligned_struct_mutex {{ + std::mutex m; + }}; + + struct alignas({0}) aligned_struct_atomic {{ + std::atomic<int> m; + }}; + + struct holds_aligned_mutexes {{ + alignas({0}) std::mutex m1; + alignas({0}) std::mutex m2; + }} hm; + + struct holds_aligned_atomics {{ + alignas({0}) std::atomic<int> a1; + alignas({0}) std::atomic<int> a2; + }} ha; + """.format(size) + + context.Message('Checking for extended alignment {0} for concurrency types... '.format(size)) + ret = context.TryCompile(textwrap.dedent(test_body), ".cpp") + context.Result(ret) + return ret + + conf.AddTest('CheckExtendedAlignment', CheckExtendedAlignment) + + # We are aware of no architecture with a cache line bigger than + # 256. If we had a way to get the cache line size of TARGET_ARCH + # that would be better, but we don't seem to have that. + for size in (64, 128, 256): + if conf.CheckExtendedAlignment(size): + conf.env.SetConfigHeaderDefine("MONGO_CONFIG_MAX_EXTENDED_ALIGNMENT", size) + # ask each module to configure itself and the build environment. moduleconfig.configure_modules(mongo_modules, conf) |