On 07/27/2017 08:13 AM, Bosco wrote: > On 27 July 2017 at 12:54, Eric Blake <eblake@xxxxxxxxxx> wrote: >> Which man pages? Echo is one of those programs that varies widely, and >> you are MUCH better off using printf(1) instead of echo(1) if you are >> trying to get newline suppression, trying to print something that might >> begin with -, or trying to print something that might contain \. > > Sorry, maybe I did't explain it correctly, I mean the man pages of the > dash source: > https://git.kernel.org/pub/scm/utils/dash/dash.git/tree/src/dash.1#n1202 > > And because of this, I got an error compiling zziplib, you may see > https://github.com/gdraheim/zziplib/blob/v0.13.67/configure#L17542 Eww - storing generated files in git - that forces everyone that checks out your project to use the EXACT same version of autotools to avoid changing the generated files unintentionally. Looking at those lines: > if test -f $ac_prefix_conf_INP ; then > echo "s/^#undef *\\([ABCDEFGHIJKLMNOPQRSTUVWXYZ_]\\)/#undef $ac_prefix_conf_UPP""_\\1/" > conftest.prefix ac_prefix_conf_INP is not defined anywhere in autoconf 2.69 sources (and you really shouldn't use the ac_ prefix if you are writing code that is not part of autoconf proper). I couldn't find mention of it at https://github.com/gdraheim/zziplib/blob/v0.13.67/configure.ac, but it may be in one of your other included files. Can you pinpoint which part of your configure.ac results in that part of the generated configure file? In all likelihood, you are using a buggy macro that is using autoconf primitives incorrectly, and thus resulting in non-portable code. But without seeing the true source, I can't help you debug your problem. >> Arguably, since it is not required by POSIX, we don't have to do it. But >> I also can't argue that POSIX forbids us to support \1 as an extension >> (it says nothing about whether implementations can have additional >> escape sequences). So I'll argue that it is intentional as a dash >> extension. But if you can make dash smaller by getting rid of the >> extension, that might be an acceptable patch. > > In that case, I think, the man page of dash should be modified with > that extension. Indeed, or the fact that it is NOT documented means that it is an unintentional bug for providing the extension. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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