Hello, I'm using GNU make 3.81 (on Linux, if this is important) and see strange behaviour in parallel builds with the following Makefile:
file1.txt file2.txt: file.in
cat $< >file1.txt|tee file2.txt
test: file1.txt file2.txt
cat $^ >$@
In a normal build, make does the right thing:
% make test
cat file.in >file1.txt|tee file2.txt
cat file1.txt file2.txt >test
In case of a parallel build, the "cat ... | tee ..." command for file[12].txt
is executed twice, which should not happen:
% make -j 2 test
cat file.in >file1.txt|tee file2.txt
cat file.in >file1.txt|tee file2.txt
cat file1.txt file2.txt >test
Bye...
Dirk
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