[Buildroot] [PATCH 1/1] package/mongodb: fix build with glibc >= 2.34

[Yann E. MORIN]

Fabrice, All,

On 2021-11-13 09:35 +0100, Fabrice Fontaine spake thusly:
> Fix the following build failure with glibc >= 2.34:
> 
> In file included from /home/giuliobenetti/autobuild/run/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/signal.h:328,
>                  from /home/giuliobenetti/autobuild/run/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/include/c++/11.2.0/csignal:42,
>                  from src/mongo/stdx/thread.h:33,
>                  from src/mongo/db/client.h:46,
>                  from src/mongo/db/operation_context.h:36,
>                  from src/mongo/db/pipeline/variables.h:32,
>                  from src/mongo/db/pipeline/dependencies.h:37,
>                  from src/mongo/db/matcher/expression.h:38,
>                  from src/mongo/db/matcher/expression_parser.h:34,
>                  from src/mongo/db/pipeline/document_source_list_sessions.cpp:34:
> src/mongo/stdx/thread.h:107:56: error: call to non-'constexpr' function 'long int sysconf(int)'
>   107 |         std::max(kMongoMinSignalStackSize, std::size_t{MINSIGSTKSZ});
>       |
> 
> Fixes:
>  - http://autobuild.buildroot.org/results/6be8efb96547f8ec6e9b776abae8c1b51501e9ed
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
>  ...-MINSIGSTKSZ-is-no-longer-a-constant.patch | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 package/mongodb/0003-SERVER-59459-With-glibc-2-34-MINSIGSTKSZ-is-no-longer-a-constant.patch
> 
> diff --git a/package/mongodb/0003-SERVER-59459-With-glibc-2-34-MINSIGSTKSZ-is-no-longer-a-constant.patch b/package/mongodb/0003-SERVER-59459-With-glibc-2-34-MINSIGSTKSZ-is-no-longer-a-constant.patch
> new file mode 100644
> index 0000000000..02b35c6e4f
> --- /dev/null
> +++ b/package/mongodb/0003-SERVER-59459-With-glibc-2-34-MINSIGSTKSZ-is-no-longer-a-constant.patch
> @@ -0,0 +1,49 @@
> +From ef08d0dbc99db8c4620512e92bfb3154282eb5d3 Mon Sep 17 00:00:00 2001
> +From: Andrew Morrow <acm at mongodb.com>
> +Date: Wed, 15 Sep 2021 15:23:42 -0400
> +Subject: [PATCH] SERVER-59459 With glibc-2.34, MINSIGSTKSZ is no longer a
> + constant
> +
> +[Retrieved (and backported) from:
> +https://github.com/mongodb/mongo/commit/ef08d0dbc99db8c4620512e92bfb3154282eb5d3]
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> +---
> + src/mongo/stdx/thread.h | 14 ++++++++++----
> + 1 file changed, 10 insertions(+), 4 deletions(-)
> +
> +diff --git a/src/mongo/stdx/thread.h b/src/mongo/stdx/thread.h
> +index 7b15bb561bd9..6f1e16cdeb36 100644
> +--- a/src/mongo/stdx/thread.h
> ++++ b/src/mongo/stdx/thread.h
> +@@ -76,11 +76,19 @@ class SigAltStackController {
> +     }
> + 
> + private:
> ++    static size_t _getStackSize() {
> ++        // It would be nice for this to be a constexpr, but
> ++        // MINSIGSTKSZ became a macro that invoked `sysconf` in glibc
> ++        // 2.34.
> ++        static const std::size_t kMinSigStkSz = MINSIGSTKSZ;
> ++        return std::max(kMongoMinSignalStackSize, kMinSigStkSz);
> ++    }
> ++
> +     void _install() const {
> +         stack_t ss;
> +         ss.ss_sp = _stackStorage.get();
> +         ss.ss_flags = 0;
> +-        ss.ss_size = kStackSize;
> ++        ss.ss_size = _getStackSize();
> +         if (sigaltstack(&ss, nullptr)) {
> +             abort();
> +         }
> +@@ -107,9 +115,7 @@ class SigAltStackController {
> +     //   ( https://jira.mongodb.org/secure/attachment/233569/233569_stacktrace-writeup.txt )
> +     static constexpr std::size_t kMongoMinSignalStackSize = std::size_t{64} << 10;
> + 
> +-    static constexpr std::size_t kStackSize =
> +-        std::max(kMongoMinSignalStackSize, std::size_t{MINSIGSTKSZ});
> +-    std::unique_ptr<std::byte[]> _stackStorage = std::make_unique<std::byte[]>(kStackSize);
> ++    std::unique_ptr<std::byte[]> _stackStorage = std::make_unique<std::byte[]>(_getStackSize());
> + 
> + #else   // !MONGO_HAS_SIGALTSTACK
> +     auto makeInstallGuard() const {
> -- 
> 2.33.0
> 
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