make有用的选项：
-d Print debugging information in addition to normal processing. The debugging information says which files are being considered for remaking, which
file-times are being compared and with what results, which files actually need to be remade, which implicit rules are considered and which are
applied---everything interesting about how make decides what to do.
--debug[=FLAGS]
Print debugging information in addition to normal processing. If the FLAGS are omitted, then the behavior is the same as if -d was specified.
FLAGS may be a for all debugging output (same as using -d), b for basic debugging, v for more verbose basic debugging, i for showing implicit
rules, j for details on invocation of commands, and m for debugging while remaking makefiles.
-p, --print-data-base
Print the data base (rules and variable values) that results from reading the makefiles; then execute as usual or as otherwise specified. This
also prints the version information given by the -v switch (see below). To print the data base without trying to remake any files, use make -p
-f/dev/null.
-n, --just-print, --dry-run, --recon
Print the commands that would be executed, but do not execute them.
--no-print-directory
Turn off -w, even if it was turned on implicitly.
-q, --question
‘‘Question mode’’. Do not run any commands, or print anything; just return an exit status that is zero if the specified targets
are already up to date, nonzero otherwise
-s, --silent, --quiet
Silent operation; do not print the commands as they are executed.
--warn-undefined-variables
Warn when an undefined variable is referenced.
make -n xxxx
如果嫌内容太多，可以过滤掉多余的信息：
make -n xxxx | grep “make -f”
