How to hide command lines in SCons output ?
Sometimes you want SCons to only show a summary of the build commands rather than the full things with all the millions of options.
Starting from SCons 0.96.92, there are basically two ways to do this.
Define env['CCCOMSTR'] to whatever you want (like "Compiling $SOURCE ..."); that just overrides the C compiler message. All standard commands have a [XXXX]STR variable that is used instead of the actual command line if it's defined.
#!python # SConstruct env = Environment(CCCOMSTR = "*** Compiling $TARGET", LINKCOMSTR = "--- Linking $TARGET") env.Program('foo', [ 'foo.c', 'bar.c' ])
$ scons -Q *** Compiling bar.o *** Compiling foo.o --- Linking foo
This solution takes a little more work than the XXXXCOMSTR solution but is also more flexible: define a PRINT_CMD_LINE_FUNC that takes over the printing of the command lines.
This function will be called by SCons whenever it needs to print a command line, thus you can do basically any transformation of tha command line output.
#!python # SConstruct def print_cmd_line(s, targets, sources, env): """s is the original command line string targets is the list of target nodes sources is the list of source nodes env is the environment""" sys.stdout.write(" Making %s ...\n"% (' and '.join([str(x) for x in targets]))) env = Environment() env['PRINT_CMD_LINE_FUNC'] = print_cmd_line
I like to use this to print a short version to stdout, while logging the full command to a log file:
#!python # SConstruct def print_cmd_line(s, targets, sources, env): if config.quiet: sys.stdout.write(" %s...\n"%(' and '.join([str(x) for x in targets]))) # Save real cmd to log file open(env['CMD_LOGFILE'], 'a').write("%s\n" % s) else: sys.stdout.write("%s\n"%s) env['PRINT_CMD_LINE_FUNC'] = print_cmd_line env['CMD_LOGFILE'] = 'build-log.txt'
You can set config.quiet to 1 however you like; parse from cmdline option, use env['CMDLINE_QUIET'] instead, whatever. Notice it's not a full build-logging solution because the output from the commands doesn't go into the build-log file. But it's still better than clogging up your shell.