Dependencies & Solaris Make

[Andrew Pickin <PickinA at logica dot com>]

Can somebody confirm that gcc 3 and SUNPRO_DEPENDENCIES
dependencies with Solaris make are behaving differently than
version 2.9.5? And is this intended behaviour?

If we consider the make file dependency

.c.o:
    @cp $(@:.o=.c) /tmp/tmp.c
    gcc -c /tmp/tmp.c -o $@
    @rm /tmp/tmp.c

[ Don't ask why I'm doing this, I'm not, but it demonstrates the point ]

Version 2.9.5 produced dependency

main.o: ...
    <system headers>
    ..... 
    cp main.c /tmp/tmp.c
    gcc -g -O2 -c /tmp/tmp.c -o main.o
    rm /tmp/tmp.c

Whereas 3.0.4 produces:

main.o: /tmp/tmp.c 
    ...
    <system headers>
    ..... 
    cp main.c /tmp/tmp.c 
    gcc -c /tmp/tmp.c -o main.o
    rm /tmp/tmp.c 

Whereas 3.1.0 produces:

main.o: /tmp/tmp.c 
    cp main.c /tmp/tmp.c 
    gcc -g -O2 -c /tmp/tmp.c -o main.o
    rm /tmp/tmp.c

I have raised the problem with the System Headers previously
but GCC 3 has introduced a new dependency of object file on the source.

This means that in the best case everything will be compiles twice the
first time around, as Sun's make re-reads the dependency list again and 
identifies a new dependency. In the worst case builds fail as temporary
files may nolonger be present.

It this intended behaviour?

AMP  


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