makefile - How do I tell GNU make to remove intermediate files right away? -

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i'm using make automate creation of file depends on several other files, each of depends on intermediate file being created, , on file on hard drive.

       /   \  a1     a2   |      |  b1     b2   |      | file1  file2

all depends on a1 , a2, depend on intermediate files b1 , b2, in turn made file1 , file2 on hard drive. here's makefile.

all: $(patsubst %, a%, 1 2)     echo "making all"  a%: b%     echo "making $@ $^"  b%: file%     echo "making $@ $^"

when make -n, see following output (after touching file1 , file2).

echo "making b1 file1" echo "making a1 b1" echo "making b2 file2" echo "making a2 b2" echo "making all" rm b1 b2

my problem b1 , b2 extremely large, , can't keep them both on hard drive @ same time (in real situation, it's not 2 dozens of these files). there way tell make dispose of b1 a1 finished, before starting make a2? in other words, see following output.

echo "making b1 file1" echo "making a1 b1" rm b1 echo "making b2 file2" echo "making a2 b2" rm b2 echo "making all"


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