From 55f0d8b41cc0c633effe51554f1bc67793f62623 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Sat, 16 Sep 2023 11:02:19 -0700
Subject: [PATCH] std: correct getcontext for Android bionic libc

I have updated Felix's ZigAndroidTemplate to work with the latest
version of Zig and we are exploring adding Android support to Mach engine.

`std.c.getcontext` is _referenced_ but not _used_, and Android's bionic libc
does not implement `getcontext`. `std.os.linux.getcontext` also cannot be
used with bionic libc, so it seems prudent to just disable this extern for now.

This may not be the perfect long-term fix, but I have a golden rebuttal to that:
before I was unable to compile Zig applications for Android, and now I can.

<img width="828" alt="image" src="https://github.com/hexops/mach/assets/3173176/1e29142b-0419-4459-9c8b-75d92f87f822">

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 lib/std/c.zig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/std/c.zig b/lib/std/c.zig
index 66875eadd0..bbfbc51633 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -408,7 +408,11 @@ pub extern "c" fn setlogmask(maskpri: c_int) c_int;
 
 pub extern "c" fn if_nametoindex([*:0]const u8) c_int;
 
-pub usingnamespace if (builtin.os.tag == .linux and builtin.target.isMusl()) struct {
+pub usingnamespace if (builtin.target.isAndroid()) struct {
+    // android bionic libc does not implement getcontext,
+    // and std.os.linux.getcontext also cannot be built for
+    // bionic libc currently.
+} else if (builtin.os.tag == .linux and builtin.target.isMusl()) struct {
     // musl does not implement getcontext
     pub const getcontext = std.os.linux.getcontext;
 } else struct {