Confirm which compiler we're using and if using clang could be faster to compile

[gustavovalverde]

Motivation

clang builds faster than gcc (linux default) but if we have both available, we have to ensure we're using clang when running cargo build

Origin: #3431 (comment)

Specifications

The C compiler should be auto-detected.

There seems to be a variable to set the preferred compiler: rust-lang/rust#635 (comment)
Maybe we need this too (?) https://stackoverflow.com/a/57817848

Tasks

Try installing clang, and making sure gcc g++ are not installed, and see if any parts of the build fail.

[teor2345]

The C compiler should be auto-detected.

We should try installing clang and not gcc g++, and see if any parts of the build fail.

[gustavovalverde]

At least on the Dockerfile, Rust comes with gcc and g++ preinstalled. We're adding clang. I'm not sure if removing gcc g++ would be the best option.

[ftm1000]

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[teor2345]

At least on the Dockerfile, Rust comes with gcc and g++ preinstalled. We're adding clang. I'm not sure if removing gcc g++ would be the best option.

Ah right. Maybe we should only remove gcc and g++ to check if clang is quicker. And if it will work for everything we build.

Then if it is quicker, we can find the right config to always use clang without removing gcc.

[mpguerra]

closing as stale