CLI: detect MinGW-flavored static libraries

Ideally on Windows, static libraries look like "foo.lib". However, CMake
and other build systems will unfortunately produce static libraries that
instead look like "libfoo.a". This patch makes Zig's CLI resolve "-lfoo"
arguments into static libraries that match this other pattern.

This patch fixes an issue with zig-bootstrap where it won't find the
LLVM, Clang, and LLD libraries.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/main.zig b/src/main.zig
index 4d69bd51c7..9487f2e962 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -2118,6 +2118,25 @@ fn buildOutputType(
                 continue :syslib;
             }
 
+            // Unfortunately, in the case of MinGW we also need to look for `libfoo.a`.
+            if (target_info.target.isMinGW()) {
+                for (lib_dirs.items) |lib_dir_path| {
+                    test_path.clearRetainingCapacity();
+                    try test_path.writer().print("{s}" ++ sep ++ "lib{s}.a", .{
+                        lib_dir_path, lib_name,
+                    });
+                    fs.cwd().access(test_path.items, .{}) catch |err| switch (err) {
+                        error.FileNotFound => continue,
+                        else => |e| fatal("unable to search for static library '{s}': {s}", .{
+                            test_path.items, @errorName(e),
+                        }),
+                    };
+                    try link_objects.append(.{ .path = try arena.dupe(u8, test_path.items) });
+                    system_libs.orderedRemoveAt(i);
+                    continue :syslib;
+                }
+            }
+
             std.log.scoped(.cli).debug("depending on system for -l{s}", .{lib_name});
 
             i += 1;