Hello,
I'm having some issues while compiling C++ code with mingw64 c++ compiler
(6.4.0) distributed within Cygwin packages.
I can guess the issue I'm going to report is not strictly related to Cygwin
distribution but I cannot test other mingw64 distributions so let me start
reporting the issue here...
Once said that, I'm open to any suggestions for better reporting place...
I'm not an expert in C and even less in C++ so I hope to not generate stupid
noise... but the same code was compiling fine with previous version (5.4) ...
The attached file is the simplest example that triggers the issue.
If I try to compile with "x86_64-w64-mingw32-gcc -o test.exe test.cpp" the
output is the following
test.cpp: In function 'int main(int, char**)':
test.cpp:7:34: error: reinterpret_cast from integer to pointer
static constexpr void* test2 = (void*)(-1LL);
^~~~~~~~~~~~~
While, if I try to compile with "i686-w64-mingw32-gcc -o test.exe test.cpp" the
output is the following
test.cpp: In function 'int main(int, char**)':
test.cpp:12:34: error: reinterpret_cast from integer to pointer
static constexpr void* test2 = (void*)(-1L);
^~~~~~~~~~~~
The test is effectively build to always fail but the current behavior is
exactly the opposite of what I was expecting:
x86_64 complains with (-1LL) cast while I was expecting it to fail on (-1L)
i686 complains with (-1L) cast while I was expecting it to fail on (-1LL)
Just to complete the picture, my environment is:
Windows 7 machine
Latest Cygwin (updated today 23 -Oct-2017)
Regards,
Paolo.
#include <windows.h>
#include <stdio.h>
int main (int argc, char **argv) {
#ifdef _WIN64
static constexpr void* test1 = (void*)(-1L);
static constexpr void* test2 = (void*)(-1LL);
printf("%llx, %llx\n", test1, test2);
#else
static constexpr void* test1 = (void*)(-1LL);
static constexpr void* test2 = (void*)(-1L);
printf("%lx, %lx\n", test1, test2);
#endif
return 0;
}
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