CODEWITHSUNDEEP
c++glibnixos
myaumyau
myaumyau

Reputation: 23

Why does nix-shell with glib not provide proper .h files?

I am trying to use nixOS to build a gtk4 application that requires glib. When running a nix-shell with the following shell.nix:

{ pkgs ? import <nixpkgs> {} }:
  pkgs.mkShell {
    nativeBuildInputs = with pkgs.buildPackages; [
    libgcc
    glib
    clang-tools
    ];
}

And the following main.cpp:

#include <glib-2.0/glib.h>

int main(){ }

Running g++ main.cpp returns

/nix/store/f8y44c3k32piprp8wj999cdlakpz86kz-glib-2.80.2-dev/include/glib-2.0/glib.h:32:10: fatal error: glib/galloca.h: No such file or directory
   32 | #include <glib/galloca.h>
      |          ^~~~~~~~~~~~~~~~
compilation terminated.

Also, another dependency (shumate) seems to expect the header file #include <glib.h>, but glib in a nix-shell seems to instead provide #include <glib-2.0/glib.h>

How can I correctly use glib in a nix-shell for development? Thank you

Upvotes: 1

Views: 167

Answers (1)

user2793489
user2793489

Reputation: 59

You might need to explicitly specify the directories for headers packages.

example:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
  buildInputs = with pkgs; [
    glib
    clang-tools
    ];
  
  # Add additional environment variables if needed
  NIX_CFLAGS_COMPILE = [ "-I${glib.dev}/include" ];
  NIX_LDFLAGS = [ "-L${glib.lib}" ];

  # Set the PKG_CONFIG_PATH to include pkg-config files for glib during build
  PKG_CONFIG_PATH = "${glib.lib}/pkgconfig";
}

The -I${glib.dev}/include flag ensures that the compiler can find the Glib headers; The -L${glib.lib} entry ensures that the linker knows where to look for the libraries;

Upvotes: 2

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