makepkg: Don't double-layer distcc on ccache

buildenv is set once for build() and a second time for package(). When
using both distcc and ccache, this lead to CCACHE_PREFIX="distcc distcc"
in package(), which breaks PKGBUILDs that execute the compiler in
package() because distcc complains:

    distcc[383041] (main) CRITICAL! distcc seems to have invoked itself
    recursively!

Avoid causing this error by only adding "distcc" to CCACHE_PREFIX if
it's not yet there.

Signed-off-by: Matti Niemenmaa <matti.niemenmaa+git@iki.fi>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/libmakepkg/buildenv/compiler.sh.in b/scripts/libmakepkg/buildenv/compiler.sh.in
index 33f19288..1cd5a019 100644
--- a/scripts/libmakepkg/buildenv/compiler.sh.in
+++ b/scripts/libmakepkg/buildenv/compiler.sh.in
@@ -44,7 +44,9 @@ buildenv_ccache() {
 buildenv_distcc() {
 	if check_buildoption "distcc" "y"; then
 		if (( using_ccache )); then
-			export CCACHE_PREFIX="${CCACHE_PREFIX:+$CCACHE_PREFIX }distcc"
+			if [[ " $CCACHE_PREFIX " != *" distcc "* ]]; then
+				export CCACHE_PREFIX="${CCACHE_PREFIX:+$CCACHE_PREFIX }distcc"
+			fi
 			export CCACHE_BASEDIR="$srcdir"
 		elif [[ -d /usr/lib/distcc/bin ]]; then
 			export PATH="/usr/lib/distcc/bin:$PATH"