windows: fixes to support using zig cc/c++ with CMake on Windows

Using zig cc with CMake on Windows was failing during compiler
detection. -nostdinc was causing the crt not to be linked, and Coff/lld.zig
assumed that wWinMainCRTStartup would be present in this case.

-nostdlib did not prevent the default behaviour of linking libc++ when
zig c++ was used. This caused libc++ to be built when CMake ran
ABI detection using zig c++, which fails as libcxxabi cannot compile
under MSVC.

- Change the behaviour of COFF -nostdinc to set /entry to the function that the
default CRT method for the specified subsystem would have called.
- Fix -ENTRY being passed twice if it was specified explicitly and -nostdlib was present.
- Add support for /pdb, /version, /implib, and /subsystem as linker args (passed by CMake)
- Remove -Ddisable-zstd, no longer needed
- Add -Ddisable-libcpp for use when bootstrapping on msvc

1 files changed, 7 insertions, 0 deletions

diff --git a/src/Compilation.zig b/src/Compilation.zig
index aa352fb9ab..5d0a9308af 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -1042,6 +1042,11 @@ pub const InitOptions = struct {
     /// (Darwin) remove dylibs that are unreachable by the entry point or exported symbols
     dead_strip_dylibs: bool = false,
     libcxx_abi_version: libcxx.AbiVersion = libcxx.AbiVersion.default,
+    /// (Windows) PDB source path prefix to instruct the linker how to resolve relative
+    /// paths when consolidating CodeView streams into a single PDB file.
+    pdb_source_path: ?[]const u8 = null,
+    /// (Windows) PDB output path
+    pdb_out_path: ?[]const u8 = null,
 };
 
 fn addPackageTableToCacheHash(
@@ -1892,6 +1897,8 @@ pub fn create(gpa: Allocator, options: InitOptions) !*Compilation {
             .headerpad_max_install_names = options.headerpad_max_install_names,
             .dead_strip_dylibs = options.dead_strip_dylibs,
             .force_undefined_symbols = .{},
+            .pdb_source_path = pdb_source_path,
+            .pdb_out_path = options.pdb_out_path,
         });
         errdefer bin_file.destroy();
         comp.* = .{