On 1/4/07, Dave Korn <[EMAIL PROTECTED]> wrote:
On 05 January 2007 01:05, David Boyce wrote:> My build model has a common link line which contains a number of -z > options (-z is a way of passing keywords to the linker on Linux and > Solaris). For instance: > > $(CC) -o program -z combreloc -z noversion -z defs ... > > The problem is that occasionally a target will need one of these > removed as a special case. But of course using $(filter-out -z > foo,...) will remove *all* the -z flags, leaving the other keywords > hanging there alone, while quoting the string like $(filter-out "-z > foo",...) doesn't match anything. Does anybody know a reasonable way > to remove a whitespace-containing string? I can think of ways > involving $(shell) with but would prefer to do it all within the make > process. Another complication is that, because this needs to be > compatible with clearmake's GNU-compatibility mode, I'm limited to > those features available since GNU make 3.76 or so. Filter out the word name, then patsubst any "-z -z" sequences into a single "-z"? /tmp $ cat foo.mk LDFLAGS:=-z combreloc -z noversion -z defs LDFLAGS_LESS_1:=$(filter-out noversion,$(LDFLAGS)) LDFLAGS_LESS:=$(patsubst -z -z,-z,$(LDFLAGS_LESS_1)) all: @echo 1 is $(LDFLAGS_LESS_1) @echo result is $(LDFLAGS_LESS) @echo done /tmp $ make -f foo.mk 1 is -z combreloc -z -z defs result is -z combreloc -z defs done /tmp $
That doesn't quite work if the flags are interspersed (like "-z foo -r -z bar"), but if you know all the -z flags are in the same spot that won't be an issue. Also removing the last flag doesn't work since you won't have two -z's in a row. You can probably hack around that by appending a -z flag that you later remove, or something. You may just be able to use $(subst), since that works on the whole string instead of each whitespace-separated element. Like: newflags := $(subst -z foo,,$(LDFLAGS)) Unfortunately this doesn't work if there may be multiple spaces between the "-z" and "foo". So to answer the OP, there might not be a "reasonable" way to do what you want - is there any reason why you absolutely have to add the -z flags in the first place if you're going to remove them later? Maybe you can move your conditional logic elsewhere and only add the correct flags when you need them. -Mike _______________________________________________ Help-make mailing list Help-make@gnu.org http://lists.gnu.org/mailman/listinfo/help-make
