hosted-libc: fixes for glibc

Author: mikdusan

src/link/Elf.zig

@@ -3294,8 +3294,17 @@ const CsuObjects = struct {
                         .static_pie  => result.set( "rcrt1.o", "crti.o", "crtbeginS.o", "crtendS.o", "crtn.o" ),
                         // zig fmt: on
                     }
-                    // Bundled glibc only has Scrt1.o .
-                    if (result.crt0 != null and link_options.target.isGnuLibC()) result.crt0 = "Scrt1.o";
+                    if (link_options.libc_installation) |_| {
+                        // hosted-glibc provides crtbegin/end objects in platform/compiler-specific dirs
+                        // and they are not known at comptime. For now null-out crtbegin/end objects;
+                        // there is no feature loss, zig has never linked those objects in before.
+                        // TODO: probe for paths, ie. `cc -print-file-name`
+                        result.crtbegin = null;
+                        result.crtend = null;
+                    } else {
+                        // Bundled glibc only has Scrt1.o .
+                        if (result.crt0 != null and link_options.target.isGnuLibC()) result.crt0 = "Scrt1.o";
+                    }
                 },
                 .dragonfly => switch (mode) {
                     // zig fmt: off
@@ -3359,11 +3368,7 @@ const CsuObjects = struct {
                 else => {
                     inline for (std.meta.fields(@TypeOf(result))) |f,i| {
                         if (@field(result, f.name)) |*obj| {
-                            if (comp.crt_files.get(obj.*)) |crtf| {
-                                obj.* = crtf.full_object_path;
-                            } else {
-                                @field(result, f.name) = null;
-                            }
+                            obj.* = try fs.path.join(arena, &[_][]const u8{ crt_dir_path, obj.* });
                         }
                     }
                 }