Re: compilation error in VPATH build

[Bruno Haible]

> The cause is that I have a 3-months old pkl-gen.pkc in $(srcdir) and a
> freshly generated one in the builddir. But the compilation picks up the
> one in $(srcdir).

The same symptom also occurs with the pvm-vm.h file:

$ make
...
../libpoke/.libs/libpoke.so: undefined reference to `pvm_routine_disassemble'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:2174: poke] Error 1

The cause is that there are two copies of pvm-vm.h: a new one that defines
pvm_routine_disassemble as a macro, and an old one that doesn't.

$ ll libpoke/pvm-vm*
-rw-rw-r-- 1 bruno bruno  488789 Nov 21 20:39 libpoke/pvm-vm1.c
-rw-rw-r-- 1 bruno bruno 2069692 Nov 21 20:39 libpoke/pvm-vm2.c
-rw-rw-r-- 1 bruno bruno  107729 Nov 21 20:39 libpoke/pvm-vm.h
$ ll build-64/libpoke/pvm-vm*
-rw-rw-r-- 1 bruno bruno  520809 Feb 19 21:47 build-64/libpoke/pvm-vm1.c
-rw-rw-r-- 1 bruno bruno 2437279 Feb 19 21:47 build-64/libpoke/pvm-vm2.c
-rw-rw-r-- 1 bruno bruno  112382 Feb 19 21:47 build-64/libpoke/pvm-vm.h

Here is a proposed patch.

0001-Fix-another-compilation-error-in-a-VPATH-build.patch
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