There may come a time when you will want to save certain
commands to be executed when everything else is done. For
instance: you are making several different libraries at one
time and you want to create the members in parallel. Problem is,
ranlib is another one of those
programs that can not be run more than once in the same directory
at the same time (each one creates a file called
__.SYMDEF
into which it stuffs information
for the linker to use. Two of them running at once will
overwrite each other's file and the result will be garbage for
both parties). You might want a way to save the ranlib
commands til the end so they can be run one after the other,
thus keeping them from trashing each other's file.
PMake allows you to do this by
inserting an ellipsis (“...”) as a command between
commands to be run at once and those to be run later.
So for the ranlib case above, you might do this:
lib1.a : $(LIB1OBJS) rm -f $(.TARGET) ar cr $(.TARGET) $(.ALLSRC) ... ranlib $(.TARGET) lib2.a : $(LIB2OBJS) rm -f $(.TARGET) ar cr $(.TARGET) $(.ALLSRC) ... ranlib $(.TARGET)
This would save both
ranlib $(.TARGET)
commands until the end, when they would run one after the
other (using the correct value for the
.TARGET
variable, of course).
Commands saved in this manner are only executed if PMake manages to re-create everything without an error.
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