compiling for no_std

[the-shank]

Hi, I cant seem to build the crate for no_std.

From lib.rs, I understand that a cfg no_std is required in order to enable no_std.

In order to enable this, I am trying to build using the command:

cargo +stable rustc -- --cfg no_std

But then the build fails.

❯ cargo +stable rustc -- --cfg no_std
   Compiling proc-macro2 v1.0.79
   Compiling autocfg v1.2.0
   Compiling unicode-ident v1.0.12
   Compiling syn v1.0.109
   Compiling cfg-if v1.0.0
   Compiling cargo-emit v0.2.1
   Compiling indoc v1.0.9
   Compiling convert_case v0.4.0
   Compiling log v0.4.21
   Compiling float-cmp v0.9.0
   Compiling num-traits v0.2.18
   Compiling integer_or_float v0.3.2 (/home/common/rustforembedded-ws/crates_nostd_stable/integer_or_float-0.3.2)
   Compiling quote v1.0.35
   Compiling derive_more v0.99.17
error[E0433]: failed to resolve: use of undeclared crate or module `std`
 --> src/error/str_conv.rs:5:5
  |
5 | use std::error::Error;
  |     ^^^ use of undeclared crate or module `std`

error[E0412]: cannot find type `String` in this scope
  --> src/str_conv/ryu.rs:19:39
   |
19 | pub(crate) fn _maybe_ryu(f: f_iof) -> String {
   |                                       ^^^^^^ not found in this scope

error[E0412]: cannot find type `String` in this scope
  --> src/str_conv/mod.rs:16:31
   |
16 | impl From<IntegerOrFloat> for String {
   |                               ^^^^^^ not found in this scope

Some errors have detailed explanations: E0412, E0433.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `integer_or_float` (lib) due to 3 previous errors