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Subject: bug#19020: flex support
Resent-From: brahim sahbi <brahim.sahbi@HIDDEN>
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Hello,

I am trying to use flex with these options
AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
So this command in the generated Makefile:
.lpp.cpp:
    $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
-- $(LEXCOMPILE)

turns my lang.lpp to lang.cppc

I have looked in the ylwrap by launching it with $(SHELL) -x and had this
printed
++ printf '%s\n' lex.yy.cc
++ sed 's|lex\.yy\.c|lang.cpp|g;'
+ to=lang.cppc

Am I doing it worng or is this a bug?

Thanks.

-- 
Brahim SAHBI

--f46d04428dc6753f830507930eac
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><div>Hello,<br><br></div>I am trying to use flex with thes=
e options<br clear=3D"all"><div><div>AM_LFLAGS =3D --header-file=3Dlang.h -=
-yyclass=3DLang --c++<br></div><div>My problem is that the file generated b=
y lex is <a href=3D"http://lex.yy.cc">lex.yy.cc</a> and not lex.yy.c.<br></=
div><div>So this command in the generated Makefile:<br>.lpp.cpp:<br>=C2=A0=
=C2=A0=C2=A0 $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $&lt; $(LEX_OUTPU=
T_ROOT).c $@ -- $(LEXCOMPILE)<br><br></div><div>turns my lang.lpp to lang.c=
ppc<br><br></div><div>I have looked in the ylwrap by launching it with $(SH=
ELL) -x and had this printed<br>++ printf &#39;%s\n&#39; <a href=3D"http://=
lex.yy.cc">lex.yy.cc</a><br>++ sed &#39;s|lex\.yy\.c|lang.cpp|g;&#39;<br>+ =
to=3Dlang.cppc<br><br></div><div>Am I doing it worng or is this a bug?<br><=
br></div><div>Thanks.<br><br></div><div>-- <br><div class=3D"gmail_signatur=
e">Brahim SAHBI<br></div>
</div></div></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: brahim sahbi <brahim.sahbi@HIDDEN>
Subject: bug#19020: Acknowledgement (flex support)
Message-ID: <handler.19020.B.141572410119613.ack <at> debbugs.gnu.org>
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Subject: bug#19020: flex support
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retitle 19020 improve support for flex in C++ mode
tags 19020 + moreinfo
thanks

Reference: http://debbugs.gnu.org/19020

On 11/11/2014 11:51 AM, brahim sahbi wrote:
> Hello,
>
Hi, sorry for the delay.

> I am trying to use flex with these options
> AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
> My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
> So this command in the generated Makefile:
> .lpp.cpp:
>      $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
> -- $(LEXCOMPILE)
>
> turns my lang.lpp to lang.cppc
>
> I have looked in the ylwrap by launching it with $(SHELL) -x and had this
> printed
> ++ printf '%s\n' lex.yy.cc
> ++ sed 's|lex\.yy\.c|lang.cpp|g;'
> + to=lang.cppc
>
> Am I doing it worng or is this a bug?
>
This is sadly a limitation, in that we must assume that the output generated
by lex and flex when a '-o' option is not given is 'yy.lex.c' (this would
not be needed if we could assume the '-o' option works, but that assumption
is not portable enough yet).  The --c++ option of flex seem to break this
expectation of the ylwrap script.  I *think* it can be worked around by
explicitly adding "-o lex.yy.c" to your AM_LFLAGS.  Can you verify that
solves your problem?

Thanks,
   Stefano

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To: brahim sahbi <brahim.sahbi@HIDDEN>, 19020 <at> debbugs.gnu.org
Subject: Re: bug#19020: flex support
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retitle 19020 improve support for flex in C++ mode
tags 19020 + moreinfo
thanks

Reference: http://debbugs.gnu.org/19020

On 11/11/2014 11:51 AM, brahim sahbi wrote:
> Hello,
>
Hi, sorry for the delay.

> I am trying to use flex with these options
> AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
> My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
> So this command in the generated Makefile:
> .lpp.cpp:
>      $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
> -- $(LEXCOMPILE)
>
> turns my lang.lpp to lang.cppc
>
> I have looked in the ylwrap by launching it with $(SHELL) -x and had this
> printed
> ++ printf '%s\n' lex.yy.cc
> ++ sed 's|lex\.yy\.c|lang.cpp|g;'
> + to=lang.cppc
>
> Am I doing it worng or is this a bug?
>
This is sadly a limitation, in that we must assume that the output generated
by lex and flex when a '-o' option is not given is 'yy.lex.c' (this would
not be needed if we could assume the '-o' option works, but that assumption
is not portable enough yet).  The --c++ option of flex seem to break this
expectation of the ylwrap script.  I *think* it can be worked around by
explicitly adding "-o lex.yy.c" to your AM_LFLAGS.  Can you verify that
solves your problem?

Thanks,
   Stefano

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To: brahim sahbi <brahim.sahbi@HIDDEN>, 19020 <at> debbugs.gnu.org
Subject: Re: bug#19020: flex support
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retitle 19020 improve support for flex in C++ mode
tags 19020 + moreinfo
thanks

Reference: http://debbugs.gnu.org/19020

On 11/11/2014 11:51 AM, brahim sahbi wrote:
> Hello,
>
Hi, sorry for the delay.

> I am trying to use flex with these options
> AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
> My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
> So this command in the generated Makefile:
> .lpp.cpp:
>      $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
> -- $(LEXCOMPILE)
>
> turns my lang.lpp to lang.cppc
>
> I have looked in the ylwrap by launching it with $(SHELL) -x and had this
> printed
> ++ printf '%s\n' lex.yy.cc
> ++ sed 's|lex\.yy\.c|lang.cpp|g;'
> + to=lang.cppc
>
> Am I doing it worng or is this a bug?
>
This is sadly a limitation, in that we must assume that the output generated
by lex and flex when a '-o' option is not given is 'yy.lex.c' (this would
not be needed if we could assume the '-o' option works, but that assumption
is not portable enough yet).  The --c++ option of flex seem to break this
expectation of the ylwrap script.  I *think* it can be worked around by
explicitly adding "-o lex.yy.c" to your AM_LFLAGS.  Can you verify that
solves your problem?

Thanks,
   Stefano

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