How to Fix the Rust Error "Linker 'Cc' Not Found" for Debian on Windows 10

Error: linker 'cc' not found when cross compiling a rust project from windows to linux using cargo

I've just figured it out.

It turns out you need to tell cargo to use the LLVM linker instead. You do this by creating a new directory called .cargo in your base directory, and then a new file called config.toml in this directory. Here you can add the lines:

[target.x86_64-unknown-linux-musl]
rustflags = ["-C", "linker-flavor=ld.lld"]

Then building with the command cargo build --target=x86_64-unknown-linux-musl should work!

linker `cc` not found,

As mentioned in the message, the linker 'cc' is missing.
You can install it using apt-get:

sudo apt-get install gcc

After the installation completes, the problem should be solved.

Linker cc not found when cross-compiling simple crate on Travis CI

Well, after experimenting and more googling, I changed my apt install command to:

sudo apt-get install -y gcc-4.8 cpp-4.8 gcc-multilib

(The first two are unmet dependencies of the third, which had to be manually installed).

Now the build runs properly.

Could not exec the linker `cc` error when running cargo build

It looks like you have installed GCC and LLVM/clang via Homebrew. Checking out the shared macOS configurations, the linker defaults to cc. I have installed the macOS developer tools:

$ clang --version
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

$ cc --version
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

This is potentially something that Rust itself could fix, but you'd have to file a bug report / enhancement request. It's possible that you might be able to work around this by symlinking clang as cc, instead of just aliasing it, as aliases probably don't exist in the environment that Rust is calling out from.

error: linker `x86_64-w64-mingw32-gcc` not found

TLDR;

Besides installing a cross target with rustup you need to install an actual cross linker and tell cargo about it using cargo config file or an environment variable

It seems you are attempting to cross compile your package.
you can read here more about cross compilation;
In a nutshell compiler is a program that takes your text source code and produces something the your operating system and cpu can understand.

When you are building software for the platform you are developing on, it's all nice. You have all the tools but when you want to target another platform or os, you need a compiler that is produced to work on your machine but outputs a binary that is supposed to work on the target platform/os.

So, In your case you need to install a cross toolchain that for mac for mingw target because rust does not have a cross linker itself. Once you get a cross toolchain all you need to do is to tell cargo how to find it.

Here is a project aims to make cross compilation less painful.

I also strongly advise you to read the cargo book

here you can see one of the ways of telling cargo about the cross linker
another way is to use an environment variable (which I like better and easier to use with makefiles)
and below you can see an example of that from one of my makefiles

and Again the cargo book refers to it

Overall cross compiling is painful it took me quite some time to understand the mechanics of it but it was worth it instead of copy pasting commands I found on the blogs.
I also feel like it lacks severe documentation. Cargo book doesn't tell you anything about finding a linker assumes you know this already and pictures cross compiling as something just work out of box after installing a target toolchain with rustup.

ld: library not found for -lpq when build rust in macOS

Firstly, I run these commands:

brew install libpq
brew link --force libpq

Then:

PQ_LIB_DIR="$(brew --prefix libpq)/lib"

cargo install diesel_cli --no-default-features --features postgres

It works for me.

macOS: Big Sur 11.5

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