Roland Ver. 4.5 Technical Information PDF herunterladen (Seite 104)

94 GNU make

PROGRAMS = server client

server_OBJS = server.o server_priv.o server_access.o

server_LIBS = priv protocol

client_OBJS = client.o client_api.o client_mem.o

client_LIBS = protocol

# Everything after this is generic

.PHONY: all

all: $(PROGRAMS)

define PROGRAM_template =

$(1): $$($(1)_OBJS) $$($(1)_LIBS:%=-l%)

ALL_OBJS += $$($(1)_OBJS)

endef

$(foreach prog,$(PROGRAMS),$(eval $(call PROGRAM_template,$(prog))))

$(PROGRAMS):

$(LINK.o) $^ $(LDLIBS) -o $@

clean:

rm -f $(ALL_OBJS) $(PROGRAMS)

8.10 The origin Function

The origin function is unlike most other functions in that it does not operate on the values

of variables; it tells you something about a variable. Speciﬁcally, it tells you where it came

from.

The syntax of the origin function is:

$(origin variable)

Note that variable is the name of a variable to inquire about, not a reference to that

variable. Therefore you would not normally use a ‘$’ or parentheses when writing it. (You

can, however, use a variable reference in the name if you want the name not to be a

constant.)

The result of this function is a string telling you how the variable variable was deﬁned:

‘undefined’

if variable was never deﬁned.

‘default’

if variable has a default deﬁnition, as is usual with CC and so on. See Section 10.3

[Variables Used by Implicit Rules], page 115. Note that if you have redeﬁned a

default variable, the origin function will return the origin of the later deﬁnition.

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 211 212

Keine Kommentare

Roland Ver. 4.5 Technical Information Seite 104