MySQL 5.7 fails to build recently

[bbarker]

Issue description

MySQL 5.7 fails to build recently:

mysql57_build_error.txt
default.nix

for me. This worked at one time, without issue.

Steps to reproduce

You can use the attached default.nix with nix-shell, or perhaps just try installing the mysql57 package. One thing that really confuses me, by the way, is that if you comment out mysql57 in default.nix, it still seems to try to build mysql. Seemingly it does this based on a reference in the shellHook, but this seems strange to me.

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

• system: "x86_64-linux"
• host os: Linux 4.13.0-32-generic, Ubuntu, 16.04.3 LTS (Xenial Xerus)
• multi-user?: no
• sandbox: no
• version: nix-env (Nix) 1.11.16
• channels(brandon): "nixpkgs-18.03pre129212.098c7f3d945, nixos-18.03pre129076.831ef4756e3"
• nixpkgs: /nix/var/nix/profiles/per-user/brandon/channels/nixpkgs

[vcunat]

To help you, MySQLs started to fail after gcc: 6 -> 7.

[vcunat]

One thing that really confuses me [...]

Why would that be strange? You want to refer to a path that isn't (validly) in nix store yet.

[bbarker]

@vcunat Thanks, that makes sense. I didn't know how much "magic" the interpreter does for stuff in shellHook.

So, how does one override the gcc version? was trying something like (mysql57.override { gcc = gcc6; }) but this is plainly incorrect on trying.

I also saw some truly ancient documentation here about overrideGCC.

[vcunat]

I had tried building with gcc overridden to gcc6 – via the usual stdenv = overrideCC stdenv gcc6; as in many other places, but that wasn't enough for me.

[bbarker]

@vcunat Indeed, if I try that I get the following output still:

-- Running cmake version 3.10.2                                                                                                                                                                                                                                                
-- Could NOT find Git (missing: GIT_EXECUTABLE)                                                                                                                                                                                                                                
-- Configuring with MAX_INDEXES = 64U                                                                                                                                                                                                                                          
-- The C compiler identification is GNU 7.3.0                                                                                                                                                                                                                                  
-- The CXX compiler identification is GNU 7.3.0                                                                                                                                                                                                                                
-- Check for working C compiler: /nix/store/gqg2vrcq7krqi9rrl6pphvsg81sb8pjw-gcc-wrapper-7.3.0/bin/gcc                                                                                                                                                                         
-- Check for working C compiler: /nix/store/gqg2vrcq7krqi9rrl6pphvsg81sb8pjw-gcc-wrapper-7.3.0/bin/gcc -- works                                                                                                                                                                
-- Detecting C compiler ABI info                                                                                                                                                                                                                                               
-- Detecting C compiler ABI info - done                                                                                                                                                                                                                                        
-- Detecting C compile features                                                                                                                                                                                                                                                
-- Detecting C compile features - done                                                                                                                                                                                                                                         
-- Check for working CXX compiler: /nix/store/gqg2vrcq7krqi9rrl6pphvsg81sb8pjw-gcc-wrapper-7.3.0/bin/g++                                                                                                                                                                       
-- Check for working CXX compiler: /nix/store/gqg2vrcq7krqi9rrl6pphvsg81sb8pjw-gcc-wrapper-7.3.0/bin/g++ -- works         

[nightkr]

{pkgs, ...}: {
  services.mysql.enable = true;
  services.mysql.package = pkgs.mysql57.override {
    stdenv = pkgs.overrideCC pkgs.stdenv pkgs.gcc6;
  };
}

Seems to build correctly with GCC 6.4 for me (running nixos-unstable).