Geek Answers Handbook

Forcing VS2008 to issue a GCC warning, similar to "warning: comparison between signed and unsigned integer expressions",

In the same direction as described in the conversion to 'size_t from' int, you can change the sign of the result - GCC, C , instead I would like to ensure that the warning that I get in GCC 4.2.1 is also marked under VS2008 SP1 in both 32-bit and 64-bit compilation compared to disabling alerts in GCC in accordance with VS2008.

For example, in accordance with GCC 4.2.1 in 64-bit conditions, we see the following as a warning in -Wall conditions:

#include <string.h> bool foo() { size_t len = 0; const char * someBuffer = "flubber"; len = strlen(someBuffer); bool retval = false; for (int j = 0; j < len; j++) // <-- warning { if (someBuffer[j] != '0') { retval = true; break; } } return retval; }

GCC Warning:

 warning: comparison between signed and unsigned integer expressions

But it is not tagged with the 64-bit VS2008 SP1 compiler, no matter what types of pragmas I try, and no matter what I allow to use / W 3 or / W4, or / w 3 some_warning_number or / w 4 some_warning_number , etc. d.

Now I don’t want to lower the GCC warning levels or turn off the warning, as they have a warning there for very good reasons. Therefore, I would like VS builds to fail in the same way when / WX is enabled. Should I live with this, or is there some kind of warning that could do the trick on VS2008?

EDIT: A warning appears for 32-bit builds, but does not use 64-bit builds, using the same set of compiler options, as shown below:

 /O2 /Ob2 /D "WIN32" /D "_WINDOWS" /D "NDEBUG" /D "_CRT_SECURE_NO_WARNINGS" /D "__WIN32__" /D "_SCL_SECURE_NO_WARNINGS" /D "_BIND_TO_CURRENT_MFC_VERSION" /D "_BIND_TO_CURRENT_CRT_VERSION" /D "WINVER=0x0502" /D "_WIN32_WINNT=0x0502" /D "_WIN32" /D "_NT" /D "_CRT_NONSTDC_NO_WARNINGS" /D "_MBCS" /FD /EHsc /MD /W3 /WX /TP /Zm1000

EDIT # 1: Seeing that it could be Visual Studio idiosyncrasy, I sent Visual C ++ Development Center warning C4018: '<': signed / unsigned mismatch was selected for 32-bit but not 64-bit compilation in VS2008 SP1 on 64-bit Windows .

EDIT # 2: I was sent a message to Microsoft Connect from the Visual C ++ Developer Center and today (2011-01-11) Microsoft answered my question and checked it as a problem with the compiler: they stated that the problem would add to the lag, which will be fixed in the next version: Microsoft Connect - warning C4018: '<': signature / unsigned mismatch is emitted only between size type types .

+4
source share
2 answers

Answering my own question: see my EDIT # 2 in the original question area. Microsoft is currently recognized as a compiler.

0
source

Something went wrong, this line of code should and will generate the desired "warning C4018: '<': signed / unsigned mismatch."

Here are my test project compiler settings, if they help at all:

/ Od / D "WIN32" / D "_DEBUG" / D "_CONSOLE" / D "_UNICODE" / D "UNICODE" / Gm / EHsc / RTC 1 / MDd / Yu "stdafx.h" / Fp "Debug \ testproj1. pch "/ Fo" Debug \ "/ Fd" Debug \ vc90.pdb "/ W 3 / nologo / c / ZI / TP / errorReport: prompt

EDIT: this is how it was tested with 32-bit Visual Studio, but you are asking for compilation with 64-bit data, so this information does not apply to you, my pardon.

+1
source

More articles:


All Articles