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quoting in heredocs zsh vs. /bin/sh

From: Greg Steuck (greg-openbsd-portsy2004.nest.cx)
Date: Sun Feb 01 2004 - 20:58:40 CST

Hello,

I am trying to make a port of ion2 and the thing started using GNU
configure (it worked so well without it, why add it now?).

Anyway, configure has the following fragment:

cat >>conftest.$ac_ext <<_ACEOF
... stuff
        printf("(found \"%s\")... ", lua_version());
... more stuff
_ACEOF

executing this fragment with /bin/sh results in:
        printf("(found "%s")... ", lua_version());

executing with /bin/zsh results in:
        printf("(found \"%s\")... ", lua_version());

Obviously the former does not compile and configure fails.

Is OpenBSD ksh doing the right thing here? Should the test be fixed
or the shell?

Thanks
Greg