[Bug build/25922] New: Build error: '_dl_main_map_l_relro_size_lsm.124' may be used uninitialized

[Bug build/25922] New: Build error: '_dl_main_map_l_relro_size_lsm.124' may be used uninitialized

[vvinayag at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25922

            Bug ID: 25922
           Summary: Build error: '_dl_main_map_l_relro_size_lsm.124' may
                    be used uninitialized
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: vvinayag at arm dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

Hi

On a native arm-none-linux-gnueabihf environment, I am seeing this error when
trying to build trunk glibc with gcc 11:

arm-none-linux-gnueabihf-gcc dl-support.c -c -std=gnu11 -fgnu89-inline  -g -O2
-Wall -Wwrite-strings -Wundef -Werror -fmerge-all-constants -frounding-math
-fno-stack-protector -Wstrict-prototypes -Wold-style-definition -fmath-errno   
 -fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0   -ftls-model=initial-exec   -o
dl-support.o

dl-support.c: In function '_dl_non_dynamic_init':
dl-support.c:392:6: error: '_dl_main_map_l_relro_size_lsm.124' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
  392 |   if (_dl_main_map.l_relro_size != 0)
      |      ^

The problem started between these two gcc commits:
22b6b5d6cfb76deb68ca5bc0bcae8b4245df946d and
05be85b649173b10d0bf10255eb15275c2dcf509.

I am investigating further.


Kind Regards
Vasee

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[Bug build/25922] Build error: '_dl_main_map_l_relro_size_lsm.124' may be used uninitialized

[vvinayag at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25922

vvinayag at arm dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |arm-none-linux-gnueabihf
               Host|                            |arm-none-linux-gnueabihf

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[Bug build/25922] Build error: '_dl_main_map_l_relro_size_lsm.124' may be used uninitialized

[fw at deneb dot enyo.de]

https://sourceware.org/bugzilla/show_bug.cgi?id=25922

Florian Weimer <fw at deneb dot enyo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fw at deneb dot enyo.de

--- Comment #1 from Florian Weimer <fw at deneb dot enyo.de> ---
This looks like a GCC bug. _dl_main_map has static storage duration, so it is
always initialized.

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[Bug build/25922] Build error: '_dl_main_map_l_relro_size_lsm.124' may be used uninitialized

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25922

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
GCC bug filed as https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94963 .

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