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: ClangBuiltLinux#122 Signed-off-by: Nathan Chancellor <[email protected]>
nathanchance · Apr 22, 2019 · 4871f8b · 4871f8b
1 parent 5df0988
commit 4871f8b
Showing 1 changed file with 29 additions and 0 deletions.
diff --git 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