[Mesa-dev] [PATCH] autoconf: bail out if flex isn't found

Gaetan Nadon memsize at videotron.ca
Wed Mar 14 08:10:20 PDT 2012

On 12-03-14 10:20 AM, Brian Paul wrote:
> On Tue, Mar 13, 2012 at 9:14 PM, Matt Turner <mattst88 at gmail.com> wrote:
>> Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=47248
>> Signed-off-by: Matt Turner <mattst88 at gmail.com>
>> ---
>>  configure.ac |    3 +++
>>  1 files changed, 3 insertions(+), 0 deletions(-)
>> diff --git a/configure.ac b/configure.ac
>> index a2d906a..e7994b0 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -66,6 +66,9 @@ if test ! -f "$srcdir/src/glsl/glcpp/glcpp-parse.y"; then
>>     fi
>>  fi
>> +if test "x$LEX" != xflex; then
>> +    AC_MSG_ERROR([flex not found - unable to compile glcpp-lex.l])
>> +fi
> What if the system actually has lex?  Would that work?  Do our .l
> files use any flex-specific features?
> -Brian
There has been a similar discussion on xorg-devel when a developer
wished to use bison specific features. The BSD systems such as FreeBSD
or MAC use the base O/S without additional packages (that they call
"ports"). The base OS does not  include GNU versions of lex & yacc.

In the light of this discussion I rephrased the xorg wiki for the lex &
yacc tools requirements. I suppose mesa is targeting most if not all
platforms that xorg builds on. Here it goes:


    yacc <http://en.wikipedia.org/wiki/Yacc>   The original AT&T parser
    generator or an upward compatible version such as bison
    <http://www.gnu.org/software/bison/> or byacc
    <http://invisible-island.net/byacc/> whitout using its specific


    lex <http://en.wikipedia.org/wiki/Lex_%28software%29>   The original
    AT&T lexical analyser generator or an upward compatible version such
    as flex <http://flex.sourceforge.net/> whitout using its specific


In the case where mesa, for the moment, is limited to flex, would there
be  a scenario where a builder configures the module such that the glcpp
subdir is not build? If so, the configuration should not abort.

When building from a tarball which includes the flex generated code, the
configuration should not abort if flex is missing as it is not required
to have a successful build. This will allow all those systems without
flex to build from a tarball.


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