support static linking, and openai_codex_responses in libpanto-c

3 files changed, 16 insertions, 9 deletions

diff --git a/docs/todos.md b/docs/todos.md
index 17dee74..72b2d4d 100644
--- a/docs/todos.md
+++ b/docs/todos.md
@@ -2,16 +2,16 @@
 
 - [x] user-provided system prompt (design: docs/archive/system-prompt.md)
 - [x] polish zig API
-- [ ] C ABI
+- [x] C ABI
 - [x] Agent compaction with custom compaction prompts
 - [x] Agent auto-compaction
 - [x] image upload support
 - [ ] google gemini native provider
-- [ ] openai responses API native provider
+- [x] openai responses API native provider
 - [ ] non-streaming
 - [ ] one-shot simple API
 - [x] message-level error retries
-- [ ] abort/cancellation
+- [x] abort/cancellation
 - [ ] user message queueing: steering, follow-up
 - [ ] step cap, stop conditions
 
diff --git a/libpanto-c/build.zig b/libpanto-c/build.zig
index 8c3cb8e..2e3160c 100644
--- a/libpanto-c/build.zig
+++ b/libpanto-c/build.zig
@@ -14,8 +14,15 @@ pub fn build(b: *std.Build) void {
     });
     mod.addImport("panto", panto_dep.module("panto"));
 
-    const lib = b.addLibrary(.{ .name = "panto", .root_module = mod, .linkage = .dynamic });
-    lib.rdynamic = true;
+    const linkage = b.option(std.builtin.LinkMode, "linkage", "Library linkage: dynamic (default) or static") orelse .dynamic;
+    const lib = b.addLibrary(.{ .name = "panto", .root_module = mod, .linkage = linkage });
+    if (linkage == .dynamic) {
+        lib.rdynamic = true;
+    } else {
+        // Bundle compiler_rt into the archive so the final consumer link
+        // (e.g. cgo) doesn't need Zig's runtime support library separately.
+        lib.bundle_compiler_rt = true;
+    }
     b.installArtifact(lib);
     b.installFile("include/panto.h", "include/panto.h");
 
diff --git a/libpanto-c/src/lib.zig b/libpanto-c/src/lib.zig
index d877abe..716e16b 100644
--- a/libpanto-c/src/lib.zig
+++ b/libpanto-c/src/lib.zig
@@ -368,10 +368,10 @@ fn freeProvider(pv: *panto.ProviderConfig) void {
             allocator.free(c.model);
             if (c.api_version.ptr != "2023-06-01".ptr) allocator.free(c.api_version);
         },
-        // The Responses style is not constructible across the C ABI (no
-        // PantoAPIStyle variant), so `convertProvider` never builds it; this
-        // case exists only to keep the union switch exhaustive.
-        .openai_responses => |c| {
+        // The Responses styles are not constructible across the C ABI (no
+        // PantoAPIStyle variant), so `convertProvider` never builds them; these
+        // cases exist only to keep the union switch exhaustive.
+        .openai_responses, .openai_codex_responses => |c| {
             allocator.free(c.api_key);
             allocator.free(c.base_url);
             allocator.free(c.model);