From 339cae7fd0af5730673fcba7d97568af24b5aa4f Mon Sep 17 00:00:00 2001
From: Eric Joldasov <bratishkaerik@getgoogleoff.me>
Date: Tue, 10 Jan 2023 13:20:40 +0600
Subject: [PATCH] cmake: install zig to 'build_dir/stage3' during building

This commit installs Zig to "build_dir/stage3" during building
so that distros' can easily find binary and use it for testing/etc.
This commit also splits "add_custom_target(stage3 ALL" and command that it invokes,
so that it won't retry it during installation,
as target will be considered not out-of-date.

See also https://www.github.com/ziglang/zig/issues/14240#issuecomment-1374642063
---
 CMakeLists.txt | 8 ++++++--
 build.zig      | 3 ---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c63bff6e0..23222d73c7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -860,8 +860,12 @@ set(ZIG_BUILD_ARGS
 )
 
 add_custom_target(stage3 ALL
-  COMMAND zig2 build compile ${ZIG_BUILD_ARGS}
-  DEPENDS zig2
+  DEPENDS "${CMAKE_BINARY_DIR}/stage3/bin/zig"
+)
+
+add_custom_command(
+  OUTPUT "${CMAKE_BINARY_DIR}/stage3/bin/zig"
+  COMMAND zig2 build --prefix "${CMAKE_BINARY_DIR}/stage3" ${ZIG_BUILD_ARGS}
   COMMENT STATUS "Building stage3"
   WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
 )
diff --git a/build.zig b/build.zig
index 6cb3e35488..78345ac9e4 100644
--- a/build.zig
+++ b/build.zig
@@ -179,9 +179,6 @@ pub fn build(b: *std.Build) !void {
     exe.entitlements = entitlements;
     b.installArtifact(exe);
 
-    const compile_step = b.step("compile", "Build the self-hosted compiler");
-    compile_step.dependOn(&exe.step);
-
     test_step.dependOn(&exe.step);
 
     exe.single_threaded = single_threaded;