Commits on Sep 26, 2023

1. fix(ci): do not use mongodbtoolchain v4 to compile mongosh MONGOSH-1604 …

   On x64 Linux, the v4 mongodbtoolchain gcc is configured with
   `--with-arch=sandybridge`, raising the minimum CPU requirements to
   that level. In particular, availability of the AVX CPU feature
   is made a prerequisite for the generated executables to run.
   
   It is possible to override this default for the v4 mongodbtoolchain
   when compiling a specific executable. However, another quirk of
   this toolchain (and reason why we want to migrate away from it) is
   that it statically links in the C++ standard library, which has
   unfortunately been compiled using the compiler's defaults.
   
   On the server side, 5.0+ uses AVX as a minimum hardware requirement,
   but since mongosh 2.x is intended to support both 4.2 and 4.4,
   we should stick to the requirements of these older versions.
   
   So, for now, just switch back to the v3 mongodbtoolchain, which
   seems to work fine in terms of compiling mongosh. The Node.js configure
   script *does* warn that the gcc version (8.5.0) in this toolchain
   is no longer officially supported, so that underlines the importance
   of switching away from the server’s toolchain in the near future
   (MONGOSH-864).
   
   We “test” this by inspecting the generated binary and looking
   at the instructions it contains, rather than trying to emulate
   older hardware.

   

   addaleax committed Sep 26, 2023
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