On Mon, Feb 11, 2019 at 11:31 AM Jonas Bülow <jonas.bu...@gmail.com> wrote:
> Sorry, I missed some information. It is the MSVC v15.5 compiler that
> complains:
>
> sqlite3.c(58167): error C2220: warning treated as error - no 'object' file
> generated [c:\work\sqlite-amalgamation-3270100\sqlite3.vcxproj]
> sqlite3.c(58167): warning C4098: 'sqlite3PagerSnapshotUnlock': 'void'
> function returning a value
> [c:\work\sqlite-amalgamation-3270100\sqlite3.vcxproj]
> Done Building Project "c:\sqlite-amalgamation-3270100\sqlite3.vcxproj"
> (default targets) -- FAILED.
>
Buggy compiler? Using VS2017 (cl.exe 19.10) there are no warnings with the
CppReference code example.
But again, might depend on sqlite3WalSnapshotUnlock() being void or not.
--DD
PS: /Wall spews tons of warnings, in MS's own std lib headers...
d:\my\demo>cl /nologo /EHsc /W1 return-void.cpp
return-void.cpp
d:\my\demo>cl /nologo /EHsc /W2 return-void.cpp
return-void.cpp
d:\my\demo>cl /nologo /EHsc /W3 return-void.cpp
return-void.cpp
d:\my\demo>cl /nologo /EHsc /W4 return-void.cpp
return-void.cpp
d:\my\demo>type return-void.cpp
#include <iostream>
#include <string>
#include <utility>
void fa(int i)
{
if (i == 2)
return;
std::cout << i << '\n';
} // implied return;
int fb(int i)
{
if (i > 4)
return 4;
std::cout << i << '\n';
return 2;
}
std::pair<std::string, int> fc(const char* p, int x)
{
return {p, x};
}
void fd()
{
return fa(10); // fa(10) is a void expression
}
int main()
{
fa(2); // returns, does nothing when i==2
fa(1); // prints its argument, then returns
int i = fb(5); // returns 4
i = fb(i); // prints its argument, returns 2
std::cout << i << '\n'
<< fc("Hello", 7).second << '\n';
fd();
}
d:\my\demo>return-void.exe
1
4
2
7
10
d:\my\demo>cl /EHsc /W4 return-void.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.10.25019 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
return-void.cpp
Microsoft (R) Incremental Linker Version 14.10.25019.0
Copyright (C) Microsoft Corporation. All rights reserved.
/out:return-void.exe
return-void.obj
d:\my\demo>
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