GNU bug report logs - #33029
AM_LFLAGS --prefix option breaks build-aux/ylwrap script

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Package: automake; Severity: wishlist; Reported by: Sjoerd van Leent <svanleent@HIDDEN>; dated Fri, 12 Oct 2018 21:37:02 UTC; Maintainer for automake is bug-automake@HIDDEN.
Severity set to 'wishlist' from 'normal' Request was from Mathieu Lirzin <mthl@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 33029 <at> debbugs.gnu.org:


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From: Mathieu Lirzin <mthl@HIDDEN>
To: Sjoerd van Leent <svanleent@HIDDEN>
Subject: Re: bug#33029: AM_LFLAGS --prefix option breaks build-aux/ylwrap
 script
References: <8fe0231b-d687-08ec-283d-f3415e8b7ed1@HIDDEN>
Date: Tue, 23 Oct 2018 20:07:31 +0200
In-Reply-To: <8fe0231b-d687-08ec-283d-f3415e8b7ed1@HIDDEN> (Sjoerd van
 Leent's message of "Fri, 12 Oct 2018 23:35:49 +0200")
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Hello Sjoerd,

Sjoerd van Leent <svanleent@HIDDEN> writes:

> Using Automake 1.15.1, I attempted to create a prefix other than the
> default "yy" for usage of the Fast Lexical Analyzer Generator. The
> FLEX arguments used for this, can be set using Automake option
> AM_LFLAGS and friends. Doing this with the --prefix argument however,
> causes a side-effect which the ylwrap script fails to act on. The
> option does not only replace yy inside the generated lex.yy.c file,
> but also changes lex.yy.c to become lex.<PREFIX>.c. This behavior
> breaks the ylwrap script, as it can no longer find lex.yy.c and
> therefore no longer move and rename it to the proper location
> (breaking the build process).
>
> I managed my way around this, by forcing flex to generate a lex.yy.c
> file (adding -o lex.yy.c also to AM_LFLAGS). The solution to my mind
> is simple: if --prefix is used in the AM_LFLAGS and friends option,
> the ylwrap script should either expect this new prefix as a
> replacement token of the "yy" part of lex.yy.c, or ylwrap should add
> -o lex.yy.c on it's own initiative.
>
> I hope that you are able to aid in repairing this minor deefficiency,
> Best Regards,
> Sjoerd van Leent

I am not familiar with the details of how Flex is working but supporting
the =E2=80=98--prefix=E2=80=99 option seems desirable. Currently Automake h=
as very
little manpower, so I encourage you to work on it yourself if you have
some time to devote to it.

Thanks.

--=20
Mathieu Lirzin
GPG: F2A3 8D7E EB2B 6640 5761  070D 0ADE E100 9460 4D37




Information forwarded to bug-automake@HIDDEN:
bug#33029; Package automake. Full text available.

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To: bug-automake@HIDDEN
From: Sjoerd van Leent <svanleent@HIDDEN>
Subject: AM_LFLAGS --prefix option breaks build-aux/ylwrap script
Message-ID: <8fe0231b-d687-08ec-283d-f3415e8b7ed1@HIDDEN>
Date: Fri, 12 Oct 2018 23:35:49 +0200
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Dear Automake Maintainers,

Using Automake 1.15.1, I attempted to create a prefix other than the 
default "yy" for usage of the Fast Lexical Analyzer Generator. The FLEX 
arguments used for this, can be set using Automake option AM_LFLAGS and 
friends. Doing this with the --prefix argument however, causes a 
side-effect which the ylwrap script fails to act on. The option does not 
only replace yy inside the generated lex.yy.c file, but also changes 
lex.yy.c to become lex.<PREFIX>.c. This behavior breaks the ylwrap 
script, as it can no longer find lex.yy.c and therefore no longer move 
and rename it to the proper location (breaking the build process).

I managed my way around this, by forcing flex to generate a lex.yy.c 
file (adding -o lex.yy.c also to AM_LFLAGS). The solution to my mind is 
simple: if --prefix is used in the AM_LFLAGS and friends option, the 
ylwrap script should either expect this new prefix as a replacement 
token of the "yy" part of lex.yy.c, or ylwrap should add -o lex.yy.c on 
it's own initiative.

I hope that you are able to aid in repairing this minor deefficiency,
Best Regards,
Sjoerd van Leent





Acknowledgement sent to Sjoerd van Leent <svanleent@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-automake@HIDDEN. Full text available.
Report forwarded to bug-automake@HIDDEN:
bug#33029; Package automake. Full text available.
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