-d:lto doesn't work on OSX: invalid linker name in argument '-fuse-ld=lld'; + other issues with -d:lto

[timotheecour]

• -d:lto doesn't work on OSX: invalid linker name in argument '-fuse-ld=lld'
• -d:lto should be renamed to -d:nimlto to avoid clashes with user/3rd party packages
• -d:lto isn't documented in https://nim-lang.github.io/Nim/nimc.html (reason more to rename to -d:nimlto)

Example

echo 'echo 1' | nim r -d:lto -

Current Output

clang: error: invalid linker name in argument '-fuse-ld=lld'
Error: execution of an external program failed: 'clang   -o /Users/timothee/.cache/nim/stdinfile_d/stdinfile  /Users/timothee/.cache/nim/stdinfile_d/stdlib_io.nim.c.o /Users/timothee/.cache/nim/stdinfile_d/stdlib_system.nim.c.o /Users/timothee/.cache/nim/stdinfile_d/@mstdinfile.nim.c.o    -ldl -fuse-ld=lld -flto'

Expected Output

works

Additional Information

• devel c2ba4ef 1.3.7
• it works on ubuntu
• --passc:-flto works on OSX
• -d:lto was added recently in Add LTO support for most compilers and do some VCC fixes #14013 /cc @Keithcat1

questions

• is --passl:-flto actually needed or just --passc:-flto? at least on some tests, only --passc:-flto seemed to matter

[juancarlospaco]

@timotheecour #15498 (comment)

[ghost]

@juancarlospaco not sure how that is related, but thanks for the link :)

[ghost]

@timotheecour I actually got the same error if you check that PR - #14013 (comment)