This is GNU make 3.79.1, running on Solaris 2.6.
Using this Makefile (tabs may be lost in the mail)
CC = gcc
INCS = -Iblorch
foo.o: INCS += -Ifoo
foo.o: INCS += -Ibar
foo.o: INCS += -Ibaz
foo: foo.o
$(CC) $(LIBS) $^ -o $@
foo.o: foo.c
$(CC) $(INCS) -c $< -o $@
foo.c:
echo "int main() { return 0; }" > foo.c
when I run a 'make', the command contains -Iblorch -Ibaz, with no reference
to the additional assignments of -Ifoo or -Ibar. I was expecting to see an
expansion of $(INCS) as "-Iblorch -Ifoo -Ibar -Ibaz".
Considering that if I specify multiple prerequisites for foo.o as follows:
foo.o: bar.h
foo.o: baz.h
each of the listed files is added to the dependency graph, I was expecting
variable assignments to happen in this fashion as well. The manual states as
follows:
All variables that appear within the variable-assignment are evaluated
within the
context of the target: thus, any previously-defined target-specific
variable values
will be in effect (make.info, node "Target-specific variable values)
Note that I can have multiple variables assigned using the same target name
foo.o: FOO += -IFOO
foo.o: INCS += -IFOO
will append -IFOO to each of $(FOO) and $(INCS), but the previous example
doesn't
process each invocation of the variable assignment.
david d zuhn
[EMAIL PROTECTED]
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