contrib/buildsystems: optionally capture the dry-run in a file

diff --git a/ci/lib.sh b/ci/lib.sh
index 16f4ecbc67196b19f45d4e5c2273b8ea35e0895d..0c7171a17354fd6dba5017e443b3d1b936f73e34 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
@@ -160,8 +163,10 @@ linux-clang|linux-gcc)
        export GIT_TEST_HTTPD=YesPlease
 
        # The Linux build installs the defined dependency versions below.
-       # The OS X build installs the latest available versions. Keep that
-       # in mind when you encounter a broken OS X build!
+       # The OS X build installs much more recent versions, whichever
+       # were recorded in the Homebrew database upon creating the OS X
+       # image.
+       # Keep that in mind when you encounter a broken OS X build!
        export LINUX_P4_VERSION="16.2"
        export LINUX_GIT_LFS_VERSION="1.5.2"
 
@@ -185,4 +190,4 @@ GIT_TEST_GETTEXT_POISON)
        ;;
 esac
 
-export MAKEFLAGS="CC=${CC:-cc}"
+MAKEFLAGS="$MAKEFLAGS CC=${CC:-cc}"