--nimargs: eg choosenim 1.2.0 --nimargs -d:danger -d:nimEmulateOverflowChecks

[timotheecour]

example use case: for users who need custom build options, eg: -d:nimEmulateOverflowChecks

ref: https://irclogs.nim-lang.org/05-04-2020.html#21:18:19

If choosenim needs to compile Nim for you then you cannot pass that flag to it

proposal

chosenim option --nimargs [args...]
which forwards as is arguments to nim compilation commands

[dom96]

See my comments on IRC

[timotheecour]

please explain:

• https://irclogs.nim-lang.org/05-04-2020.html#21:37:06

yeah, actually you may be able to do that without involving choosenim at all
AFAIK there is a global cfg file that Nim will read

we should not have to set global state (that may impact other running processes etc) just to pass options to choosenim

• https://irclogs.nim-lang.org/05-04-2020.html#21:37:42

that said, when compiling Nim you usually build C sources... which won't have the code that the -d flag enables

csources ships with its own nimbase.h (from v0.20) which doesn't need -d:nimEmulateOverflowChecks

so csources will build fine, building a working Nim/bin/nim

then the --nimargs options can be forwarded to the next boostrapping steps:

Nim/bin/nim c $(nim_args...) koch 
./koch boot $(nim_args...)

--nimargs could be anything user wants, eg --skipUserCfg, -d:danger, -d:nimEmulateOverflowChecks etc