http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60867
Bug ID: 60867
Summary: std::atomic> should fail to compile
since unique_ptr is not trivial to copy
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: kjell.hedstrom at logrhythm dot com
Created attachment 32621
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32621&action=edit
main.ii compiled with: g++ -v -save-temps -std=c++11 -O2 -Wall -Wextra
-pthread main.cpp
std::atomic is OK for T's that are not trivial to copy. Example
std::atomic> should fail to g++ compile but is succeeds.
Example:
std::atomic> a;
Expected output is a compilation error. Maybe something similar to what you
would get from clang 3.4 Ref:
http://coliru.stacked-crooked.com/view?id=eb48cd3c29b3be15
See attachment main.cpp with code example. It can be build with no problems
g++ -std=c++11 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp
the main.ii File was created with:
g++ -v -save-temps -std=c++11 -O2 -Wall -Wextra -pthread main.cpp
gcc -v gives:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/probe/libexec/gcc/x86_64-linux-gnu/4.8.2/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../gcc-4.8.2/configure -build=x86_64-linux-gnu
--prefix=/usr/local/probe --enable-cxx-flags='-L/usr/local/probe/lib
-L/usr/local/probe/lib64 -Wl,-rpath -Wl,/usr/local/probe/lib64 -Wl,-rpath
-Wl,/usr/local/probe/lib ' --enable-c-flags='-L/usr/local/probe/lib
-L/usr/local/probe/lib64 -Wl,-rpath -Wl,/usr/local/probe/lib64 -Wl,-rpath
-Wl,/usr/local/probe/lib ' --enable-shared --enable-threads=posix
--enable-libstdcxx-time=rt --enable-checking=release --with-multilib-list=m64
--with-mpc=/usr/local/probe --enable-gather-detailed-mem-stats
--enable-vtable-verify --with-mpc=/usr/local/probe/ --enable-languages=c,c++
Thread model: posix
gcc version 4.8.2 (GCC)
// Only one attachment could be added so the main.cpp is pasted in
// --- main.cpp ---
#include
#include
#include
#include
int main() {
std::atomic> a; // this line should fail to compile.
a.store(std::unique_ptr(new int{5}));
for (size_t index = 0; index < 100; ++index){
a.load();
}
//typedef std::unique_ptr IntPtr;
// Hint: using gcc's internal 'has_trivial_copy' shows that it is NOT
// trivial to copy
//std::cout << "Is copyable " << __has_trivial_copy(IntPtr)
return 0;
}
