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* [Bug middle-end/111752] New: -Wfree-nonheap-object (vec.h:347:10: warning: 'free' called on unallocated object 'dest_bbs') during bootstrap with LTO
@ 2023-10-10 4:03 sjames at gcc dot gnu.org
2023-10-10 9:16 ` [Bug middle-end/111752] " rguenth at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: sjames at gcc dot gnu.org @ 2023-10-10 4:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111752
Bug ID: 111752
Summary: -Wfree-nonheap-object (vec.h:347:10: warning: 'free'
called on unallocated object 'dest_bbs') during
bootstrap with LTO
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
I'm not sure this was always there - I think I would've noticed if it was a
long-standing thing. I get this -Wfree-nonheap-object warning during bootstrap.
I can reproduce it with:
```
./configure --disable-analyzer --disable-bootstrap --disable-cet
--disable-default-pie --disable-default-ssp --disable-fixincludes
--disable-gcov --disable-libada --disable-libatomic --disable-libgomp
--disable-libitm --disable-libquadmath --disable-libsanitizer --disable-libssp
--disable-libstdcxx-pch --disable-libvtv --disable-lto --disable-multilib
--disable-nls --disable-objc-gc --disable-systemtap --disable-werror
--enable-languages=c,c++ --prefix=/tmp/bisect --without-isl --without-zstd
--with-system-zlib --enable-bootstrap --enable-lto
make BUILD_CONFIG=bootstrap-lto -j$(nproc)
```
I can only reproduce when building with bootstrap-lto.
On trunk at r14-4523-gfb124f2a23e92b, I get this:
```
/home/sam/git/gcc/host-x86_64-pc-linux-gnu/prev-gcc/xg++
-B/home/sam/git/gcc/host-x86_64-pc-linux-gnu/prev-gcc/
-B/tmp/bisect/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/home/sam/git/gcc/prev-x86_64-pc-linux-gnu/
libstdc++-v3/src/.libs
-B/home/sam/git/gcc/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/home/sam/git/gcc/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/home/sam/git/gcc/pre
v-x86_64-pc-linux-gnu/libstdc++-v3/include
-I/home/sam/git/gcc/libstdc++-v3/libsupc++
-L/home/sam/git/gcc/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/home/sam/git/gcc/prev-x86_64-pc-linux-gnu/libstdc+
+-v3/libsupc++/.libs -no-pie -g -O2 -fno-checking -flto=jobserver
-frandom-seed=1 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmis
sing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -fno-common
-DHAVE_CONFIG_H -no-pie -static-libstdc++ -static-libgcc
-o cc1plus \
cp/cp-lang.o c-family/stub-objc.o cp/call.o cp/class.o cp/constexpr.o
cp/constraint.o cp/coroutines.o cp/cp-gimplify.o cp/cp-objcp-common.o
cp/cp-ubsan.o cp/cvt.o cp/contracts.o cp/cxx-pretty-print.o cp
/decl.o cp/decl2.o cp/dump.o cp/error.o cp/except.o cp/expr.o cp/friend.o
cp/init.o cp/lambda.o cp/lex.o cp/logic.o cp/mangle.o cp/mapper-client.o
cp/mapper-resolver.o cp/method.o cp/module.o cp/name-lookup.o
cp/optimize.o cp/parser.o cp/pt.o cp/ptree.o cp/rtti.o cp/search.o
cp/semantics.o cp/tree.o cp/typeck.o cp/typeck2.o cp/vtable-class-hierarchy.o
attribs.o c-family/c-common.o c-family/c-cppbuiltin.o c-family
/c-dump.o c-family/c-format.o c-family/c-gimplify.o c-family/c-indentation.o
c-family/c-lex.o c-family/c-omp.o c-family/c-opts.o c-family/c-pch.o
c-family/c-ppoutput.o c-family/c-pragma.o c-family/c-pretty-pr
int.o c-family/c-semantics.o c-family/c-ada-spec.o c-family/c-ubsan.o
c-family/known-headers.o c-family/c-attribs.o c-family/c-warn.o
c-family/c-spellcheck.o i386-c.o glibc-c.o cc1plus-checksum.o libbackend.a
main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a
../libdecnumber/libdecnumber.a ../libcody/libcody.a \
libcommon.a ../libcpp/libcpp.a ../libbacktrace/.libs/libbacktrace.a
../libiberty/libiberty.a ../libdecnumber/libdecnumber.a -lmpc -lmpfr -lgmp
-rdynamic -lz
../.././gcc/spellcheck.cc: In function '_Z17get_edit_distancePKciS0_i.part.0':
../.././gcc/spellcheck.cc:71:61: warning: argument 1 value
'18446744073709551615' exceeds maximum object size 9223372036854775807
[-Walloc-size-larger-than=]
71 | edit_distance_t *v_two_ago = new edit_distance_t[len_s + 1];
| ^
/home/sam/git/gcc/libstdc++-v3/libsupc++/new:133:26: note: in a call to
allocation function 'operator new []' declared here
133 | _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW
(std::bad_alloc)
| ^
../.././gcc/spellcheck.cc:72:61: warning: argument 1 value
'18446744073709551615' exceeds maximum object size 9223372036854775807
[-Walloc-size-larger-than=]
72 | edit_distance_t *v_one_ago = new edit_distance_t[len_s + 1];
| ^
/home/sam/git/gcc/libstdc++-v3/libsupc++/new:133:26: note: in a call to
allocation function 'operator new []' declared here
133 | _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW
(std::bad_alloc)
| ^
../.././gcc/spellcheck.cc:73:58: warning: argument 1 value
'18446744073709551615' exceeds maximum object size 9223372036854775807
[-Walloc-size-larger-than=]
73 | edit_distance_t *v_next = new edit_distance_t[len_s + 1];
| ^
/home/sam/git/gcc/libstdc++-v3/libsupc++/new:133:26: note: in a call to
allocation function 'operator new []' declared here
133 | _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW
(std::bad_alloc)
In function 'release',
inlined from 'release' at ../.././gcc/vec.h:2027:20,
inlined from '__dt_base ' at ../.././gcc/vec.h:1686:19,
inlined from 'can_be_handled' at
../.././gcc/tree-switch-conversion.cc:1512:1:
../.././gcc/vec.h:347:10: warning: 'free' called on unallocated object
'dest_bbs' [-Wfree-nonheap-object]
347 | ::free (v);
| ^
../.././gcc/tree-switch-conversion.cc: In function 'can_be_handled':
../.././gcc/tree-switch-conversion.cc:1484:39: note: declared here
1484 | auto_vec<int, m_max_case_bit_tests> dest_bbs;
| ^
[...]
```
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug middle-end/111752] -Wfree-nonheap-object (vec.h:347:10: warning: 'free' called on unallocated object 'dest_bbs') during bootstrap with LTO
2023-10-10 4:03 [Bug middle-end/111752] New: -Wfree-nonheap-object (vec.h:347:10: warning: 'free' called on unallocated object 'dest_bbs') during bootstrap with LTO sjames at gcc dot gnu.org
@ 2023-10-10 9:16 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-10-10 9:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111752
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
Keywords| |diagnostic,
| |missed-optimization
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think this is one of the usual false positives resulting from either too
active diagnostics, threading or from missed optimizations.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-10-10 4:03 [Bug middle-end/111752] New: -Wfree-nonheap-object (vec.h:347:10: warning: 'free' called on unallocated object 'dest_bbs') during bootstrap with LTO sjames at gcc dot gnu.org
2023-10-10 9:16 ` [Bug middle-end/111752] " rguenth at gcc dot gnu.org
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