ci: clear and mark MAKEFLAGS exported just once

Clearing it once upfront, and turning all the assignment into
appending, would future-proof the code even more, to prevent
mistakes the previous one fixed from happening again.

Also, mark the variable exported just once at the beginning.  There
is no point in marking it exported repeatedly.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/ci/lib.sh b/ci/lib.sh
index cee51a4cc4c042fa119f5e38a17d6c7615a21972..288a5b3884ad825c99601ba5dc62ee81c62d7d64 100755 (executable)
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -74,6 +74,9 @@ check_unignored_build_artifacts ()
        }
 }
 
+# Clear MAKEFLAGS that may come from the outside world.
+export MAKEFLAGS=
+
 # Set 'exit on error' for all CI scripts to let the caller know that
 # something went wrong.
 # Set tracing executed commands, primarily setting environment variables
@@ -101,7 +104,7 @@ then
        BREW_INSTALL_PACKAGES="git-lfs gettext"
        export GIT_PROVE_OPTS="--timer --jobs 3 --state=failed,slow,save"
        export GIT_TEST_OPTS="--verbose-log -x --immediate"
-       export MAKEFLAGS="--jobs=2"
+       MAKEFLAGS="$MAKEFLAGS --jobs=2"
 elif test -n "$SYSTEM_COLLECTIONURI" || test -n "$SYSTEM_TASKDEFINITIONSURI"
 then
        CI_TYPE=azure-pipelines
@@ -126,7 +129,7 @@ then
        BREW_INSTALL_PACKAGES=gcc@8
        export GIT_PROVE_OPTS="--timer --jobs 10 --state=failed,slow,save"
        export GIT_TEST_OPTS="--verbose-log -x --write-junit-xml"
-       export MAKEFLAGS="--jobs=10"
+       MAKEFLAGS="$MAKEFLAGS --jobs=10"
        test windows_nt != "$CI_OS_NAME" ||
        GIT_TEST_OPTS="--no-chain-lint --no-bin-wrappers $GIT_TEST_OPTS"
 else
@@ -185,4 +188,4 @@ GIT_TEST_GETTEXT_POISON)
        ;;
 esac
 
-export MAKEFLAGS="$MAKEFLAGS CC=${CC:-cc}"
+MAKEFLAGS="$MAKEFLAGS CC=${CC:-cc}"