CODEWITHSUNDEEP
c++gccboostmingw
ebbek
ebbek

Reputation: 43

BOOST_STATIC_ASSERT_MSG - error message missing

I have a problem getting BOOST_STATIC_ASSERT_MSG to issue a meaningful error message. I have boiled it down to this:

#include <boost/static_assert.hpp>

namespace StaticChecks
{
    BOOST_STATIC_ASSERT_MSG( false, "Where is my error message?" );
}

The specified error message is nowhere to be seen. Instead I get the following:

c:\tryit> x86_64-w64-mingw32-g++ -O0 -g -m64 -Wall -IC:\boost_1_50_0 -IC:\MinGW-W64\msys\include compiletimechecks.cpp -c -o compiletimechecks.cpp.o
compiletimechecks.cpp:5:5: error: invalid application of 'sizeof' to incomplete type 'boost::STATIC_ASSERTION_FAILURE<false>'
compiletimechecks.cpp:5:5: error: template argument 1 is invalid
compiletimechecks.cpp:5:63: error: invalid type in declaration before ';' token

I'm on Windows 7 and using GCC/C++ 64-bit:

c:\tryit> x86_64-w64-mingw32-g++ --version
x86_64-w64-mingw32-g++ (Built by MinGW-builds project) 4.7.2

I get the same error on Linux (Ubuntu 12.04 LTS 64 bit) using gcc version 4.6.3 and Boost version 1.48.

Also, I should add that when the assertion succeeds, it works as expected.

Upvotes: 4

Views: 2259

Answers (1)

Angew is no longer proud of SO
Angew is no longer proud of SO

Reputation: 171167

From the docs on BOOST_STATIC_ASSERT_MSG:

If the C++0x static_assert feature is not available, BOOST_STATIC_ASSERT_MSG(x, msg) will be treated as BOOST_STATIC_ASSERT(x).

You're apparently building without -std=c++0x, so static_assert is not available and the message is thus not displayed.

Upvotes: 3

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