Description of problem: Compiling the code generated by flex produces the following compiler warning: lexer.c: In function ‘yy_scan_bytes’: lexer.c:1813:17: warning: comparison of integer expressions of different signedness: ‘yy_size_t’ {aka ‘long unsigned int’} and ‘int’ [-Wsign-compare] for ( i = 0; i < _yybytes_len; ++i ) ^ Version-Release number of selected component (if applicable): flex-2.6.1-7.fc28.x86_64 gcc-8.1.1-1.fc28.x86_64 Compiling with -Wall How reproducible: 100% Steps to Reproduce: 1. Produce any simple flex gramar 2. Use flex to generate lexer sources 3. Compile sources with -Wall Actual results: Compiler warning. Expected results: No compiler warning. Additional info: This is a long standing bug, also reported in Fedora 24 (#1373601) and CentOS 7 (#1210022). The CentOS 7 bug is VERIFIED at present and contains patches and additional information. It maybe possible to bring the same fixes easilty into Fedora 28.
Vanilla flex 2.6.4 doesn't produce these warnings and has many less warnings when building the sources too.
Created attachment 1454614 [details] Fix for warnings in generated code. This changes the local loop variable to the same type as the limit value, an int as passed into the function. This fixes the compiler warnings in the generated code.
This message is a reminder that Fedora 28 is nearing its end of life. On 2019-May-28 Fedora will stop maintaining and issuing updates for Fedora 28. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '28'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 28 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
Fedora 28 changed to end-of-life (EOL) status on 2019-05-28. Fedora 28 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.