[Bug middle-end/55371] New: [asan] False -Werror=uninitialized

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* [Bug middle-end/55371] New: [asan] False -Werror=uninitialized
@ 2012-11-18  0:03 hjl.tools at gmail dot com
  2012-11-28 19:29 ` [Bug sanitizer/55371] " hjl.tools at gmail dot com
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2012-11-18  0:03 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55371

             Bug #: 55371
           Summary: [asan] False -Werror=uninitialized
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


[hjl@gnu-tools-1 gcc]$
/export/build/gnu/gcc-asan/build-x86_64-linux/./prev-gcc/g++
-B/export/build/gnu/gcc-asan/build-x86_64-linux/./prev-gcc/
-B/usr/gcc-4.8.0/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-B/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libsanitizer/asan/.libs
-I/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/export/gnu/import/git/sources/gcc/libstdc++-v3/libsupc++
-L/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-c   -g -O2 -faddress-sanitizer -DIN_GCC   -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common 
-DHAVE_CONFIG_H -I. -I. -I/export/gnu/import/git/sources/gcc/gcc
-I/export/gnu/import/git/sources/gcc/gcc/.
-I/export/gnu/import/git/sources/gcc/gcc/../include
-I/export/gnu/import/git/sources/gcc/gcc/../libcpp/include 
-I/export/gnu/import/git/sources/gcc/gcc/../libdecnumber
-I/export/gnu/import/git/sources/gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I/export/gnu/import/git/sources/gcc/gcc/../libbacktrace   
/export/gnu/import/git/sources/gcc/gcc/explow.c -o explow.o
/export/gnu/import/git/sources/gcc/gcc/explow.c: In function ‘rtx_def*
plus_constant(machine_mode, rtx, long int)’:
/export/gnu/import/git/sources/gcc/gcc/explow.c:84:7: error: ‘y’ may be used
uninitialized in this function [-Werror=uninitialized]
   rtx y;
       ^
cc1plus: all warnings being treated as errors
[hjl@gnu-tools-1 gcc]$
/export/build/gnu/gcc-asan/build-x86_64-linux/./prev-gcc/g++
-B/export/build/gnu/gcc-asan/build-x86_64-linux/./prev-gcc/
-B/usr/gcc-4.8.0/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-B/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libsanitizer/asan/.libs
-I/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/export/gnu/import/git/sources/gcc/libstdc++-v3/libsupc++
-L/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/export/build/gnu/gcc-asan/build-x86_64-linux/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-c   -g -O2  -DIN_GCC   -fno-exceptions -fno-rtti -fasynchronous-unwind-tables
-W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common  -DHAVE_CONFIG_H -I. -I. -I/export/gnu/import/git/sources/gcc/gcc
-I/export/gnu/import/git/sources/gcc/gcc/.
-I/export/gnu/import/git/sources/gcc/gcc/../include
-I/export/gnu/import/git/sources/gcc/gcc/../libcpp/include 
-I/export/gnu/import/git/sources/gcc/gcc/../libdecnumber
-I/export/gnu/import/git/sources/gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I/export/gnu/import/git/sources/gcc/gcc/../libbacktrace   
/export/gnu/import/git/sources/gcc/gcc/explow.c -o explow.o
[hjl@gnu-tools-1 gcc]$


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [Bug sanitizer/55371] [asan] False -Werror=uninitialized
  2012-11-18  0:03 [Bug middle-end/55371] New: [asan] False -Werror=uninitialized hjl.tools at gmail dot com
@ 2012-11-28 19:29 ` hjl.tools at gmail dot com
  2012-12-20 18:19 ` Joost.VandeVondele at mat dot ethz.ch
  2021-04-12 20:06 ` [Bug bootstrap/55371] " msebor at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2012-11-28 19:29 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55371

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-28 19:29:25 UTC ---
Also

/export/gnu/import/git/gcc/libgfortran/intrinsics/unpack_generic.c: In function
‘unpack_internal’:
/export/gnu/import/git/gcc/libgfortran/intrinsics/unpack_generic.c:149:12:
warning: ‘rstride[0]’ may be used uninitialized in this function
[-Wuninitialized]
   rstride0 = rstride[0];
            ^
/export/gnu/import/git/gcc/libgfortran/intrinsics/unpack_generic.c:150:12:
warning: ‘fstride[0]’ may be used uninitialized in this function
[-Wuninitialized]
   fstride0 = fstride[0];
            ^
/export/gnu/import/git/gcc/libgfortran/intrinsics/unpack_generic.c:151:12:
warning: ‘mstride[0]’ may be used uninitialized in this function
[-Wuninitialized]
   mstride0 = mstride[0];
            ^


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [Bug sanitizer/55371] [asan] False -Werror=uninitialized
  2012-11-18  0:03 [Bug middle-end/55371] New: [asan] False -Werror=uninitialized hjl.tools at gmail dot com
  2012-11-28 19:29 ` [Bug sanitizer/55371] " hjl.tools at gmail dot com
@ 2012-12-20 18:19 ` Joost.VandeVondele at mat dot ethz.ch
  2021-04-12 20:06 ` [Bug bootstrap/55371] " msebor at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: Joost.VandeVondele at mat dot ethz.ch @ 2012-12-20 18:19 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55371

Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-12-20
                 CC|                            |Joost.VandeVondele at mat
                   |                            |dot ethz.ch
     Ever Confirmed|0                           |1

--- Comment #2 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2012-12-20 18:18:56 UTC ---
seen as well, workaround: configure with --disable-werror


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [Bug bootstrap/55371] [asan] False -Werror=uninitialized
  2012-11-18  0:03 [Bug middle-end/55371] New: [asan] False -Werror=uninitialized hjl.tools at gmail dot com
  2012-11-28 19:29 ` [Bug sanitizer/55371] " hjl.tools at gmail dot com
  2012-12-20 18:19 ` Joost.VandeVondele at mat dot ethz.ch
@ 2021-04-12 20:06 ` msebor at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-04-12 20:06 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55371

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|sanitizer                   |bootstrap
                 CC|                            |msebor at gcc dot gnu.org
         Resolution|---                         |WONTFIX
             Status|NEW                         |RESOLVED

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
In a recent build of GCC 11 I count 69 instances of -Wmaybe-uninitialized
without sanitization but not one looking like the one in comment #0.  I don't
have a sanitized build handy but the instrumentation injected by the sanitizers
is known to induce false positives, so (I think) GCC builds with
-Wno-error=maybe-uniitialized when sanitization is enabled.  There are a lot of
bugs against the warning with small test cases and odds are that one of them
captures the essence of this ancient bug if it is, in fact, a bug and if it
hasn't disappeared by now.  Since there's been no activity on this bug in
almost a decade I'm going to resolve this report as WONTFIX.  If it's still
reproducible please reopen and attach a standalone test case to make it easy to
reproduce.

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-04-12 20:06 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-11-18  0:03 [Bug middle-end/55371] New: [asan] False -Werror=uninitialized hjl.tools at gmail dot com
2012-11-28 19:29 ` [Bug sanitizer/55371] " hjl.tools at gmail dot com
2012-12-20 18:19 ` Joost.VandeVondele at mat dot ethz.ch
2021-04-12 20:06 ` [Bug bootstrap/55371] " msebor at gcc dot gnu.org

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