From 101c33309896ca3849f7c489cbfb97297ca2f8a2 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <natechancellor@gmail.com>
Date: Mon, 22 Apr 2019 15:44:54 -0700
Subject: [PATCH] env-setup.sh: Remove GNU tools in the Docker image before
 building

This will help ensure that the GNU tools aren't hard coded anywhere as
the goal of the LLVM tools is to be as compatible as possible.

Closes: #122
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 env-setup.sh | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/env-setup.sh b/env-setup.sh
index 46a6e2b..c997f9d 100755
--- a/env-setup.sh
+++ b/env-setup.sh
@@ -20,3 +20,32 @@ ccache --set-config=cache_dir=/travis/.ccache
 
 # Clear out the stats so we actually know the cache stats
 ccache -z
+
+# Ensure that GNU tools are not available when using LLVM tools
+function remove() {
+    mapfile -t files < <(type -ap "${@}")
+    for file in "${files[@]}"; do rm -vf "${file}"; done
+}
+
+case ${ARCH:=arm64} in
+    arm32*) CROSS_COMPILE=arm-linux-gnueabi- ;;
+    arm64) CROSS_COMPILE=aarch64-linux-gnu- ;;
+    ppc32) CROSS_COMPILE=powerpc-linux-gnu- ;;
+    ppc64le) CROSS_COMPILE=powerpc64le-linux-gnu- ;;
+esac
+
+# Remove the target's tools
+remove "${CROSS_COMPILE:-}"ar
+remove "${CROSS_COMPILE:-}"gcc
+[[ ${LD:-} =~ ld.lld ]] && remove ${CROSS_COMPILE:-}{ld,ld.bfd,ld.gold}
+
+# Remove the host tools if we are cross compiling
+if [[ -n ${CROSS_COMPILE:-} ]]; then
+    remove ar
+    remove gcc
+    [[ ${LD:-} =~ ld.lld ]] && remove {ld,ld.bfd,ld.gold}
+fi
+
+# Ensure that we always exit cleanly because a bash script's
+# exit code is always the code of the last command
+exit 0