Zig cross build for powerpc64-linux-gnu failed by not setting _CALL_ELF correctly

[congcongkuo]

Zig Version

zig-macos-aarch64-0.14.0

Steps to Reproduce and Observed Behavior

I am trying to upgrade bdwgc's build.zig file to Zig 0.14. I encountered problems when cross build to powerpc64-linux-gnu.

minimal reproducible example:
main.c

#include <stdio.h>

int fun(int a, int b) {
    printf("%d", _CALL_ELF);
}

build.zig

const builtin = @import("builtin");
const std = @import("std");

pub fn build(b: *std.Build) void {
    const optimize = b.standardOptimizeOption(.{});
    const target = b.standardTargetOptions(.{});

    const gc_mod = b.createModule(.{
        .target = target,
        .optimize = optimize,
    });

    const gc = b.addLibrary(.{
        .linkage = .dynamic,
        .name = "gc",
        .root_module = gc_mod,
    });

    gc.addCSourceFiles(.{
        .files = &.{"main.c"},
    });

    gc.linkLibC();

    b.installArtifact(gc);
}

erroe message:

install
└─ install gc
   └─ zig build-lib gc Debug powerpc64-linux-gnu 1 errors
/zig-macos-aarch64-0.14.0/lib//libc/include/powerpc64-linux-gnu/gnu/stubs.h:14:11: error: 'gnu/stubs-64-v2.h' file not found
# include <gnu/stubs-64-v2.h>
          ^~~~~~~~~~~~~~~~~~~~
/Developer/_play/zig/play5/main.c:1:10: note: in file included from /Developer/_play/zig/play5/main.c:1:
#include <stdio.h>
         ^
/zig-macos-aarch64-0.14.0/lib//libc/include/generic-glibc/stdio.h:28:10: note: in file included from /zig-macos-aarch64-0.14.0/lib//libc/include/generic-glibc/stdio.h:28:
#include <bits/libc-header-start.h>
         ^
/zig-macos-aarch64-0.14.0/lib//libc/include/generic-glibc/bits/libc-header-start.h:33:10: note: in file included from /zig-macos-aarch64-0.14.0/lib//libc/include/generic-glibc/bits/libc-header-start.h:33:
#include <features.h>
         ^
/zig-macos-aarch64-0.14.0/lib//libc/include/generic-glibc/features.h:564:10: note: in file included from /zig-macos-aarch64-0.14.0/lib//libc/include/generic-glibc/features.h:564:
#include <gnu/stubs.h>
         ^
error: warning(compilation): failed to delete '/Users/guo/Developer/_play/zig/play5/.zig-cache/tmp/8e9ccc696ed1dc25-main.o.d': FileNotFound

error: the following command failed with 1 compilation errors:
/zig-macos-aarch64-0.14.0/zig build-lib /Developer/_play/zig/play5/main.c -ODebug -target powerpc64-linux-gnu -mcpu baseline -Mroot -lc --cache-dir /Developer/_play/zig/play5/.zig-cache --global-cache-dir /.cache/zig --name gc -dynamic --zig-lib-dir /zig-macos-aarch64-0.14.0/lib/ --listen=-
Build Summary: 0/3 steps succeeded; 1 failed
install transitive failure
└─ install gc transitive failure
   └─ zig build-lib gc Debug powerpc64-linux-gnu 1 errors
error: the following build command failed with exit code 1:
/Developer/_play/zig/play5/.zig-cache/o/f7380d759af2e9268205837f85703565/build /zig-macos-aarch64-0.14.0/zig /zig-macos-aarch64-0.14.0/lib /Developer/_play/zig/play5 /Developer/_play/zig/play5/.zig-cache /.cache/zig --seed 0x5be4522d -Zf2f28acb7b0e9878 -Dtarget=powerpc64-linux-gnu

Expected Behavior

According to a stackoverflow post, powerpc64-linux-gnu build should use <gnu/stubs-64-v1.h> as the file content of /zig-macos-aarch64-0.14.0/lib/libc/include/powerpc64-linux-gnu/gnu/stubs.h

#include <bits/wordsize.h>

#if __WORDSIZE == 32
# include <gnu/stubs-32.h>
#endif
#if __WORDSIZE == 64 && _CALL_ELF != 2
# include <gnu/stubs-64-v1.h>
#endif
#if __WORDSIZE == 64 && _CALL_ELF == 2
# include <gnu/stubs-64-v2.h>
#endif

I think _CALL_ELF doesn't be set properly.

[alexrp]

powerpc64-linux-gnu is not currently supported due to #5927. We force ELFv2 because it at least allows powerpc64-linux-none to work for Zig code that doesn't link libc.