Linking fails with 'undefined reference to' libdl functions.

[ziglibs]

Linking fails with 'undefined reference to' libdl functions.

[BratishkaErik]

I do not understand why the compiler does not grab the available system libraries, which do seem to have to correct symbols in them.

See ziglang/zig#6469

./libs/zgl/c.zig:6:5: error: C import failed
    @cImport({
    ^
./zig-cache/o/fca946021a1176b5ad82bf37c8570071/cimport.h:1:10: note: 'epoxy/gl.h' file not found
#include <epoxy/gl.h>
         ^
./libs/zgl/zgl.zig:228:6: error: container '.zgl.c' has no member called 'glClear'
    c.glClear(@as(types.BitField, if (mask.color) c.GL_COLOR_BUFFER_BIT else 0) |

Do you have libepoxy headers (usually package libepoxy-dev or smth.) installed on your system?

[Linouth]

Yeah. I'm using Arch which has the headers included in the libepoxy package.

[BratishkaErik]

Yeah. I'm using Arch which has the headers included in the libepoxy package.

Ok, maybe clearing cache will help you

$ rm -r ~/.cache/zig/ where-project/zig-cache/

[Linouth]

Same issue.
Though, explicitly adding exe.addSystemIncludePath("/usr/include/"); gives the error ld.lld: error: unable to find library -lepoxy. So it does seem that the compiler has trouble finding the lib and header files..?

[BratishkaErik]

Try this (and clear cache):

    const exe = b.addExecutable("motorsim", "src/main.zig");
    exe.setTarget(target);
    exe.setBuildMode(mode);

    exe.addPackagePath("glfw", "libs/mach-glfw/src/main.zig");
    glfw.link(b, exe, .{});

    exe.addPackagePath("zgl", "libs/zgl/zgl.zig");
    exe.linkSystemLibrary("dl");
    exe.linkSystemLibrary("epoxy");

    exe.install();

[Linouth]

Same include error.

[BratishkaErik]

Same include error.

Try this (and clear cache):

    const exe = b.addExecutable("motorsim", "src/main.zig");

    exe.addPackagePath("glfw", "libs/mach-glfw/src/main.zig");
    glfw.link(b, exe, .{});

    exe.addPackagePath("zgl", "libs/zgl/zgl.zig");
    exe.linkSystemLibrary("dl");
    exe.linkSystemLibrary("epoxy");

    exe.setTarget(target);
    exe.setBuildMode(mode);
    exe.install();

It works for me without -Dtarget=blabla etc.

[Linouth]

That did it! I had no idea that setTarget and setBuildMode are place dependent in the build file??
Thanks!