Unreproducible on 6.1.0 targeting either i686 or x86_64.
In order to make a *minimal* testcase, please remove unrelated stuff,
such as redundant `#include`s. For example, you can run
`g++ -E -o foo.cc` to get a preprocessed source file then
cut unrelated code off.
------------------
Best regards,
lh_mouse
2016-08-22
-------------------------------------------------------------
发件人：leon zadorin <leonleon77@xxxxxxxxx>
发送日期：2016-08-22 16:47
收件人：gcc-help
抄送：
主题：GCC ICE bug with segfault...
Hello,
I am not sure whether I can report a bug without an account in
bugzilla (account creation temporarily disabled on that site)
... so I am posting this here for the time being
GCC (trunk, rev 239646 -- but likely with earlier versions also, I
haven't had the chance to test those yet) appears to ICE with
segmentation fault given the following code (validity of which aside
for the moment):
#include <stdlib.h>
#include <string.h>
struct Blah {
char * a;
};
template <typename T>
void Test(T & Obj) {
auto && a(Obj.a);
a = (char*)::malloc(1024 * 1024);
::memset(a + 28, 'X', 6);
}
int main() {
Blah d;
Test(d);
return 0;
}
When compiled as
c++ -Wall main.c++
Causes GCC itself to crash hard:
main.c++: In function 'void Test(T&)':
main.c++:12:25: internal compiler error: Segmentation fault
::memset(a + 28, 'X', 6);
Whereas dropping -Wall prevents compiler from crashing.
Taking out the 'template' nature from the above code also allows
compiler not to crash (even with -Wall being used). Similar
(non-crash) outcome is if one simply takes out "+ 28" offset from the
code...
Target: x86_64-w64-mingw32
Configured with: ../gcc-trunk/configure --enable-checking=release
--disable-werror --disable-multilib --host=x86_64-w64-mingw32 --build
=x86_64-w64-mingw32 --target=x86_64-w64-mingw32
--prefix=/C/YYYYY/installed --enable-lto --program-prefix=
--enable-langu
ages=c,c++,lto --disable-nls --disable-libgcj --enable-threads=posix
--enable-seh-exceptions --enable-graphite
--with-sysroot=/C/YYYYY/installed
Thread model: posix
gcc version 7.0.0 20160822 (experimental) (GCC)
Perhaps it is something silly I have done with my GCC build, I will
try to retest with the released version 6.0 on mingw 64 target soon
also.
Best regards
leon.
