coff: fix incorrect default image_base values and re-enable shared …

…library tests on Windows

This was the cause of aarch64-windows shared libraries causing  "bad image" errors
during load-time linking. I also re-enabled the tests that were surfacing this bug.

src/link/Coff.zig

@@ -274,11 +274,15 @@ pub fn createEmpty(
 
         .image_base = options.image_base orelse switch (output_mode) {
             .Exe => switch (target.cpu.arch) {
-                .aarch64 => 0x140000000,
-                .thumb, .x86_64, .x86 => 0x400000,
+                .aarch64, .x86_64 => 0x140000000,
+                .thumb, .x86 => 0x400000,
+                else => unreachable,
+            },
+            .Lib => switch (target.cpu.arch) {
+                .aarch64, .x86_64 => 0x180000000,
+                .thumb, .x86 => 0x10000000,
                 else => unreachable,
             },
-            .Lib => 0x10000000,
             .Obj => 0,
         },
 

test/standalone/c_compiler/build.zig

@@ -5,11 +5,6 @@ pub fn build(b: *std.Build) void {
     const test_step = b.step("test", "Test it");
     b.default_step = test_step;
 
-    if (builtin.os.tag == .windows) {
-        // https://github.com/ziglang/zig/issues/16965
-        return;
-    }
-
     add(b, test_step, "test_c_Debug", "test_cpp_Debug", .Debug);
     add(b, test_step, "test_c_ReleaseFast", "test_cpp_ReleaseFast", .ReleaseFast);
     add(b, test_step, "test_c_ReleaseSmall", "test_cpp_ReleaseSmall", .ReleaseSmall);

test/standalone/coff_dwarf/build.zig

@@ -12,11 +12,6 @@ pub fn build(b: *std.Build) void {
     else
         b.resolveTargetQuery(.{ .os_tag = .windows });
 
-    if (builtin.cpu.arch == .aarch64) {
-        // https://github.com/ziglang/zig/issues/18427
-        return;
-    }
-
     const exe = b.addExecutable(.{
         .name = "main",
         .root_source_file = b.path("main.zig"),

test/standalone/load_dynamic_library/build.zig

@@ -10,11 +10,6 @@ pub fn build(b: *std.Build) void {
 
     if (builtin.os.tag == .wasi) return;
 
-    if (builtin.os.tag == .windows) {
-        // https://github.com/ziglang/zig/issues/16960
-        return;
-    }
-
     const lib = b.addSharedLibrary(.{
         .name = "add",
         .root_source_file = b.path("add.zig"),

test/standalone/shared_library/build.zig

@@ -4,11 +4,6 @@ pub fn build(b: *std.Build) void {
     const test_step = b.step("test", "Test it");
     b.default_step = test_step;
 
-    if (@import("builtin").os.tag == .windows) {
-        // https://github.com/ziglang/zig/issues/16959
-        return;
-    }
-
     const optimize: std.builtin.OptimizeMode = .Debug;
     const target = b.graph.host;
     const lib = b.addSharedLibrary(.{