$ zig build -Denable-llvm
$ zig2 build -p build-stage3
$ cat a.zig
const std = @import("std");
pub fn main() void {
    const stderr = std.io.getStdErr();
    stderr.writeAll("Hello, world!\n") catch {};
}
$ build-stage3/bin/zig run a.zig
Hello, world!

LLVM backend needs some adjustments still.

Closes #11375

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$ cd build
$ cmake .. -DZIG_PREFER_CLANG_CPP_DYLIB=ON -DZIG_OMIT_STAGE2=on -DCMAKE_BUILD_TYPE=Release
-- Configuring zig version 0.10.0-dev.1825+101aac92c
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vexu/Documents/zig/zig/build
$ make -s -j 12
Consolidate compiler generated dependencies of target opt_c_util
Consolidate compiler generated dependencies of target zigcpp
Consolidate compiler generated dependencies of target embedded_softfloat
[  1%] Built target opt_c_util
[  5%] Built target zigcpp
[ 86%] Built target embedded_softfloat
Consolidate compiler generated dependencies of target zigstage1
[ 98%] Built target zigstage1
Consolidate compiler generated dependencies of target zig0
[ 99%] Building CXX object CMakeFiles/zig0.dir/src/stage1/zig0.cpp.o
[ 99%] Linking CXX executable zig0
[ 99%] Built target zig0
[ 99%] Building self-hosted component /home/vexu/Documents/zig/zig/build/zig1.o
Consolidate compiler generated dependencies of target zig
[ 99%] Linking CXX executable zig
[100%] Built target zig
$ cd ..
$ build/zig build -p build-stage2 -Denable-llvm -Dconfig_h=build/config.h
$ build-stage2/bin/zig build -p build-stage3 -Denable-llvm -Dconfig_h=build/config.h
$ build-stage3/bin/zig build -p build-stage4 -Denable-llvm -Dconfig_h=build/config.h
$ 

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stage1 (release) build stage2 (debug) (LLVM backend):
 * wall clock: 47.80 seconds
 * peak rss: 8.6 GiB

stage2 (release) build stage3 (debug) (LLVM backend):
 * wall clock: 43.26 seconds
 * peak rss: 2.3 GiB