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From: Thomas Dickey <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: "new" flex produces uncompilable code for cases where "old" flex works.
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autolearn=no version=2.60-bugs.debian.org_2005_01_02
Package: flex
Version: 2.5.31-36
Severity: important
The implementation of the -P option is incompatible with flex 2.5.4a,
since it does not leave the POSIX lex variables yytext and yyleng
accessible in the lexer when this option is used. Here is a fix:
Index: main.c
--- flex-2.5.31/main.c 2003-04-01 01:51:38.000000000 +0000
+++ flex-2.5.31-20051223/main.c 2005-12-23 21:10:13.000000000 +0000
@@ -1661,6 +1661,15 @@
("%option yyclass only meaningful for C++
scanners"));
}
+ /*
+ * Ensure that lexers work when the -P option is used.
+ * The yytext_ptr variable in this implementation is useless.
+ */
+ if ( strcmp(prefix, "yy") ) {
+ outn ("#define [[yytext]] yytext");
+ outn ("#define [[yyleng]] yyleng");
+ }
+
if (useecs)
numecs = cre8ecs (nextecm, ecgroup, csize);
else
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.4.27-td2
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
---------------------------------------
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From: Manoj Srivastava <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Yes, the new flex is not compatible with the old one
Organization: Manoj Srivastava's Home
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Hi,
This is not a bug, this is a feature. Compatibility with the
old flex has not been retained.
The behaviour of flex has changed in the latest release, yes.
This is part of the gcc migration process; flex has been updated (the
buggy, rickety set of patches required to make it work with gcc was
dumped in favour of a well engineered upstream migration). Please
look at the upstream Changelog for details.
Flex has also grown an extensive test suite, and there is a
test for each of the features reported below. I strongly think that
these changes, which require changes in source, and not a bug, are
causing the vast majority of failures.
As you may see, flex scanners have become reentrant, the c++ versions
are compatible with recent c++ compilers (conform to ANSI C++, gcc
3.2), supports bison variables yylval and yylloc. Some variables have
been renamed. Flex generates C99 defs now; see
YY_TRADITIONAL_FUNC_DEFS yylineno is present in all
scanners. yylineno is per-buffer in reentrant scanners. flex tries
its best to output only the relevant portions of the skeleton when
generating a scanner, thus avoiding as much conditional compilation
as possible
The signature of all functions has changed. flex has new
command line options, and option parsing has changed (now also
supports POSIX conventions optionally). Handles POSIXLY_CORRECT
environment variable. Various i18n translations are included in the
distribution. flex now works with recent bison versions
This is not a single short lived change.
I understand that this requires all packages using lex to
massage their lexers to conform to the new behaviour of flex; but the
gains in reduced complexity of the scanner and reentrancy and
standards compliance are well worth it.
In case you can't change the source code of your application
to conform to the new flex, the package flex-old exists.
manoj
--
There is no education that is not political. An apolitical education
is also political because it is purposely isolating.
Manoj Srivastava <[EMAIL PROTECTED]> <http://www.golden-gryphon.com/>
1024D/BF24424C print 4966 F272 D093 B493 410B 924B 21BA DABB BF24 424C
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