From 6e8f869bf37b4aa2e4dbfda10aadf06925226b2e Mon Sep 17 00:00:00 2001
From: Tony Duan <tony84727@gmail.com>
Date: Tue, 14 Jun 2022 22:58:15 +0800
Subject: [PATCH] chore: a separate target directory for runtimetest

building static-linked runtimetest requires additional RUSTFLAGS env
var. Unfortunately, the additional env var invalids the build cache,
leading cargo rebuilding everytime.

See https://github.com/rust-lang/cargo/issues/8716

A temporary solution is to build runtimetest in a seperate
`runtimetest-target` directory.

Signed-off-by: Tony Duan <tony84727@gmail.com>
---
 .gitignore       | 1 +
 scripts/build.sh | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.gitignore b/.gitignore
index a5fcd5d1..40befbf5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .idea/
 
 **/target
+/runtimetest-target
 .vagrant/
 
 tags
diff --git a/scripts/build.sh b/scripts/build.sh
index 045bfa32..9d771d71 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -11,6 +11,7 @@ usage_exit() {
 
 VERSION=debug
 TARGET=x86_64-unknown-linux-gnu
+RUNTIMETEST_TARGET="$ROOT/runtimetest-target"
 while getopts ro:h OPT; do
     case $OPT in
         o) output=${OPTARG}
@@ -36,8 +37,9 @@ OUTPUT=${output:-$ROOT/bin}
 
 cargo build --target ${TARGET} ${OPTION} --bin youki
 cargo build --target ${TARGET} ${OPTION} --bin integration_test
-RUSTFLAGS="-Ctarget-feature=+crt-static" cargo build --target ${TARGET} ${OPTION} --bin runtimetest
+CARGO_TARGET_DIR=${RUNTIMETEST_TARGET} RUSTFLAGS="-Ctarget-feature=+crt-static" cargo build --target ${TARGET} ${OPTION} --bin runtimetest
 
-mv ${ROOT}/target/${TARGET}/${VERSION}/{youki,integration_test,runtimetest} ${OUTPUT}/
+mv ${ROOT}/target/${TARGET}/${VERSION}/{youki,integration_test} ${OUTPUT}/
+mv ${RUNTIMETEST_TARGET}/${TARGET}/${VERSION}/runtimetest ${OUTPUT}/
 
 exit 0