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Remove g++ signed/unsigned comparison warning in generated scanner

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Compiling a flex generated scanner with g++ with all warnings turned on (-Wall)
produces a warning due to "comparison of integer expressions of different
signedness". This change removes the warning by using the same signedness.

This bug was a regression inherited from upstream flex during the rebase to
flex-2.6.1. The same bug was fixed previously (albeit differently) by commit
a3088c99e8.
This commit is contained in:
Arjun Shankar 2018-06-27 14:43:04 +02:00 committed by Arjun Shankar
parent 2aa1cb2053
commit 967afaa6d0
2 changed files with 30 additions and 1 deletions
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24
flex-yybytes_len.patch Normal file
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@ -0,0 +1,24 @@
commit cf4121fa97abac8aeaa5e08b8fc0b2380228494e
Author: rlar <rlar>
Date: Sat Feb 27 22:46:02 2016 +0100
generated code, `_yybytes_len' is of type `int', fix code accordingly
Index: b/src/flex.skl
===================================================================
--- a/src/flex.skl
+++ b/src/flex.skl
@@ -2451,11 +2451,11 @@ YY_BUFFER_STATE yy_scan_bytes YYFARGS2(
YY_BUFFER_STATE b;
char *buf;
yy_size_t n;
- yy_size_t i;
+ int i;
m4_dnl M4_YY_DECL_GUTS_VAR();
/* Get memory for full buffer, including space for trailing EOB's. */
- n = (yy_size_t) _yybytes_len + 2;
+ n = (yy_size_t) (_yybytes_len + 2);
buf = (char *) yyalloc( n M4_YY_CALL_LAST_ARG );
if ( ! buf )
YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" );

7
flex.spec
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@ -3,7 +3,7 @@
Summary: A tool for creating scanners (text pattern recognizers)
Name: flex
Version: 2.6.1
Release: 7%{?dist}
Release: 8%{?dist}
# parse.c and parse.h are under GPLv3+ with exception which allows
# relicensing. Since flex is shipped under BDS-style license,
# let's assume that the relicensing was done.
@ -17,6 +17,7 @@ Patch0: flex-2.6.0-yyless.patch
Patch1: flex-max_size.patch
Patch2: flex-new_size.patch
Patch3: flex-yy_buf_size.patch
Patch4: flex-yybytes_len.patch
Requires: m4
BuildRequires: gettext bison m4 help2man
@ -66,6 +67,7 @@ plain text and PDF formats.
%patch1 -p1
%patch2 -p1
%patch3 -p1
%patch4 -p1
%build
%configure --docdir=%{_pkgdocdir} CFLAGS="-fPIC $RPM_OPT_FLAGS"
@ -135,6 +137,9 @@ echo ============END TESTING===========
%{_pkgdocdir}
%changelog
* Wed Jun 27 2018 Arjun Shankar <arjun@redhat.com> - 2.6.1-8
- Remove g++ signed/unsigned comparison warning in generated scanner
* Fri Feb 09 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.6.1-7
- Escape macros in %%changelog