[lwip-devel] [bug #61106] compiling newest source fails with "-O3" optims

[Florian La Roche]

URL:
  <https://savannah.nongnu.org/bugs/?61106>

                 Summary: compiling newest source fails with "-O3" optims
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: flaroche
            Submitted on: Thu 02 Sep 2021 12:20:36 PM UTC
                Category: apps
                Severity: 3 - Normal
              Item Group: Compiler Warning
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

Compiling the newest source with "-O3" optims (versus "-Og")
with gcc 10.2.1 (from Debian testing) fails with the following
lines:

cd
/home/flaroche/data/leightweightip/lwip/build/contrib/ports/unix/example_app
&& /usr/bin/cc  -I/home/flaroche/data/leightweightip/lwip/src/include
-I/home/flaroche/data/leightweightip/lwip/contrib
-I/home/flaroche/data/leightweightip/lwip/contrib/ports/unix/port/include
-I/home/flaroche/data/leightweightip/lwip/contrib/examples/example_app -g -O3
-Wall -pedantic -Wparentheses -Wsequence-point -Wswitch-default -Wextra
-Wundef -Wshadow -Wpointer-arith -Wcast-qual -Wwrite-strings
-Wold-style-definition -Wcast-align -Wmissing-prototypes -Wnested-externs
-Wunreachable-code -Wuninitialized -Waggregate-return
-Wlogical-not-parentheses -Wredundant-decls -Wc++-compat -Wlogical-op
-Wtrampolines -Wc90-c99-compat -o
CMakeFiles/makefsdata.dir/__/__/__/__/src/apps/http/makefsdata/makefsdata.c.o
-c
/home/flaroche/data/leightweightip/lwip/src/apps/http/makefsdata/makefsdata.c
In file included from
/home/flaroche/data/leightweightip/lwip/src/apps/http/makefsdata/makefsdata.c:20:
In function ‘tinydir_readfile’,
    inlined from ‘tinydir_open_sorted.constprop’ at
/home/flaroche/data/leightweightip/lwip/src/apps/http/makefsdata/tinydir.h:377:7:
/home/flaroche/data/leightweightip/lwip/src/apps/http/makefsdata/tinydir.h:81:25:
warning: ‘strcat’ accessing 4097 or more bytes at offsets
[-4611686018427387904, 4611686018427387903] and [-4611686018427383808,
4611686018427391999] may overlap 1 byte at offset [-4611686018427383808,
9223372036854775807] [-Wrestrict]
   81 | #define _tinydir_strcat strcat
      |                         ^
/home/flaroche/data/leightweightip/lwip/src/apps/http/makefsdata/tinydir.h:536:2:
note: in expansion of macro ‘_tinydir_strcat’
  536 |  _tinydir_strcat(file->path, file->name);
      |  ^~~~~~~~~~~~~~~






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File Attachments:


-------------------------------------------------------
Date: Thu 02 Sep 2021 12:20:36 PM UTC  Name: lwip.patch  Size: 1013B   By:
flaroche
How to swith to -O3 optims
<http://savannah.nongnu.org/bugs/download.php?file_id=51862>

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