[RFC] Improve/clarify versioninfo output

[christiangnrd]

**Best reviewed with "Ignore whitespace"

When looking into #61292, I tried to use versioninfo to get the JIT’s cpu target. I found out that even though it shares parentheses with “ORCJIT”, the displayed cpu is always just the host CPU.

Then I fell into the confusing and undocumented output of versioninfo rabbit hole trying to improve it and this is the result of that. Once I have a better idea about which changes are/aren't welcome, I’ll edit the docstring to be more explicit about what each item is.

May be worth reviewing per-commit as I've tried to separate each change

This PR:

• Changes “GB” and “MB” to “GiB” and “MiB” when reporting memory information.
• Hides WORD_SIZE behind the verbose flag.
• Moves the detected host cpu llvm target to be with the CPU instead of in the LLVM section. I changed this because the previous way implied it was the JIT target cpu. They usually match, but they may not if julia was launched with the -C flag
• The build commit has been moved down into “Build Information”
• Refactors the “Build Information” section. It will now always be shown, and the GC julia was built with was moved from the “Platform Information” section.
• Adds the target cpu and triple that the base system image was built with when verbose=true. This adds a new Sys.BASE_SYSIMG_TARGET constant variable because calling sysimage_target from InteractiveUtils returns “sysimage”. Hidden behind verbose flag
• LLVM section now reports the JIT target CPU where the host CPU use to be. This expands/uses API that was added by @gbaraldi for GPUCompiler in Expose the Julia JIT with a C API #49858.
• The triple on the OS line is now the JIT target triple (same implementations worries as above), and the build machine triple (MACHINE) is now reported in the verbose-only sysimage line in “Build Information”. This is probably more relevant on macOS, where the triple includes the kernel version, but I find it confusing to show the build kernel version when reporting the current OS.

Current output (master):

julia> versioninfo()
Julia Version 1.14.0-DEV.1927
Commit 7d591fcb00c (2026-03-21 05:36 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 12 × Apple M2 Max
  WORD_SIZE: 64
  LLVM: libLLVM-20.1.8 (ORCJIT, apple-m2)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

julia> versioninfo(verbose=true)
Julia Version 1.14.0-DEV.1927
Commit 7d591fcb00c (2026-03-21 05:36 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  uname: Darwin 25.4.0 Darwin Kernel Version 25.4.0: Thu Mar  5 21:59:20 PST 2026; root:xnu-12377.101.14~18/RELEASE_ARM64_T6020 arm64 arm
  CPU: Apple M2 Max:
                 speed         user         nice          sys         idle          irq
       #1-12  2400 MHz      72878 s          0 s      49120 s     496724 s          0 s
  Memory: 32.0 GB (1832.421875 MB free)
  Uptime: 171177.0 sec
  Load Avg:  3.67041015625  4.4208984375  4.2578125
  WORD_SIZE: 64
  LLVM: libLLVM-20.1.8 (ORCJIT, apple-m2)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)
Environment:

This PR:

julia> versioninfo()
Julia Version 1.14.0-DEV.1940
Build Info:
  Official https://julialang.org release
  Commit: 756eb8be874 (2026-03-24 13:31 UTC)
  GC: Built with stock GC
Platform Info:
  OS: macOS (arm64-apple-darwin25.4.0)
  CPU: 12 × Apple M2 Max (apple-m2)
  LLVM: libLLVM-20.1.8 (ORCJIT, apple-m2)
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

julia> versioninfo(verbose=true)
Julia Version 1.14.0-DEV.1940
Build Info:
  Official https://julialang.org release
  Commit: 756eb8be874 (2026-03-24 13:31 UTC)
  GC: Built with stock GC
  Sysimage: generic;apple-m1,clone_all (arm64-apple-darwin24.0.0)
Platform Info:
  OS: macOS (arm64-apple-darwin25.4.0)
  uname: Darwin 25.4.0 Darwin Kernel Version 25.4.0: Thu Mar  5 21:59:20 PST 2026; root:xnu-12377.101.14~18/RELEASE_ARM64_T6020 arm64 arm
  CPU: Apple M2 Max (apple-m2):
                 speed         user         nice          sys         idle          irq
       #1-12  2400 MHz     245810 s          0 s     120835 s    1650663 s          0 s
  Memory: 32.0 GiB (6047.796875 MiB free)
  Uptime: 412120.0 sec
  Load Avg:  5.1875  4.126953125  4.16015625
  WORD_SIZE: 64
  LLVM: libLLVM-20.1.8 (ORCJIT, apple-m2)
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)
Environment: