Make and "cc" executable

Make and "cc" executable

[Pierre Neidhardt]

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Hi Guix!

With gcc-toolchain install, I still have no "cc" executable.
With many other distributions, "cc" is a symlink to either gcc and
clang.

Programs like "make" default to "cc" as the value of CC, the C compiler
environment variable.
Therefore a simple "make" fails on Guix when the Makefile does not
specify some fallback for CC.

What are the recommendations?  Should all Makefiles specify a fallback
for CC?  Or is it up to the user to either export a properly set CC
environment variable from their .profile or similar?

--
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Make and "cc" executable

[Ricardo Wurmus]

Hi Pierre,

> With gcc-toolchain install, I still have no "cc" executable.
> With many other distributions, "cc" is a symlink to either gcc and
> clang.

Right, “cc” is not provided by upstream GCC.  Some distributions provide
“cc” for compatibility with old Unices, but for Guix we generally don’t
augment upstream packages like that.

> What are the recommendations?

When CC is used, then it should be configured to be GCC with “CC=gcc”.

--
Ricardo

Re: Make and "cc" executable

[Pierre Neidhardt]

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Alright, so what I did is add the following to my ~/.profile.

--8<---------------cut here---------------start------------->8---
if ! command -v cc >/dev/null 2>&1; then
	if command -v clang >/dev/null 2>&1; then
		export CC=clang
	else
		export CC=gcc
	fi
fi
--8<---------------cut here---------------end--------------->8---

Now I can run `make` and it works as expected for projects that don't define CC.

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Make and "cc" executable

[Pierre Neidhardt]

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Actually it doesn't.  It breaks some Makefiles and some languages like Go (with
cgo).

Instead, I've added a "cc" script to my PATH with the following:

--8<---------------cut here---------------start------------->8---
for i in /usr/local/bin/cc /usr/bin/cc /bin/cc clang gcc; do
	command -v $i >/dev/null 2>&1 && exec $i "$@"
done
--8<---------------cut here---------------end--------------->8---

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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