Hi John
On 12/19/21 16:16, John Crow wrote:
I ought to have said at first how much I appreciate having Valgrind
available. It's invaluable, and thank you for your attention.
'You are building with the same compiler that was used at configure time?'
Yes. I verified by doing a configure>>make>>make check right now in a
freshly untarred build folder. Outside of specifying --prefix to
configure, defaults all the way.
It shouldn't make a difference, but does running the 'autogen.sh' script
in the Valgrind root directory before configure make any difference?
'I'm using GCC 11 and in /usr/include/c++/11/new there is [snipped]
... Does yours look similar?'
Yes, for me it's in /usr/include/c++/9/new.
I'll have to figure out the diff --git suggestion.
In both case the unsigned constant for the size [64U and 320U] is
changed to be cast to size_t [size_t(64U) and size_t(320U)]
Two chunks out of config.log that might or might not be pertinent, I
simply searched for 'delete':
configure:10224: result: no
configure:10857: result: yes
configure:10888: checking if g++ supports aligned new and delete
configure:10916: c++ -c -std=c++17 conftest.cpp >&5
configure:10916: $? = 0
configure:10919: result: yes
That's the one.
Can you also try directly compiling the file to try to find out what
does and does not work.
For instance (tests done with GCC 9.4 on FreeBSD)
cd memcheck/tests
g++9 -g cxx17_aligned_new.cpp -std=c++17 -o foo // this works
g++9 -g cxx17_aligned_new.cpp -std=c++17 -o foo -fno-sized-deallocation
cxx17_aligned_new.cpp: In function 'int main()':
cxx17_aligned_new.cpp:25:56: error: no matching function for call to
'operator delete(MyClass*&, unsigned int, std::align_val_t)'
25 | operator delete(myClass, 64U, std::align_val_t(64U));
| ^
In file included from cxx17_aligned_new.cpp:2:
/usr/local/lib/gcc9/include/c++/new:129:6: note: candidate: 'void
operator delete(void*)'
129 | void operator delete(void*) _GLIBCXX_USE_NOEXCEPT
[SNIP other candidates and 2nd error]
One last suggestion, you can you run the preprocessor and see if the
delete overloads are there?
g++9 -g cxx17_aligned_new.cpp -std=c++17 -E -o foo.E
then view foo.E and look for "operator delete". The last two overloads
that I see are
void operator delete(void*, std::size_t, std::align_val_t)
noexcept __attribute__((__externally_visible__));
void operator delete[](void*, std::size_t, std::align_val_t)
noexcept __attribute__((__externally_visible__));
A+
Paul
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