Some gcc Headers will not Compile due to Use of C++0x Variadic Templates

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	September 6, 2011 12:00 AM PDT

Reference Number : DPD200027211

Version : 11.1, Intel® C++ Compiler XE 2011

Product : Intel® C++ Composer XE for Linux*, Intel® C++ Compiler for Linux* Professional Edition

Operating System : Linux*

Problem Description : From gcc 4.3 forward, certain gcc header files contain uses of the C++0x feature variadic templates. This feature is not yet supported by the Intel® C++ Compiler, so the use of the feature in these header files causes compilation errors with the Intel compiler. The following is a table of header files and the gcc versions where these header files have issues.

	gcc 4.3	gcc 4.4	gcc 4.5
tuple	fails	fails	fails
thread	†	fails	fails
mutex	†	fails	fails
type_traits	passes	fails	fails
functional	passes	passes	fails
future	†	†	fails

† Header file does not exist in this version of gcc

An example of an error you might see is:

error: function is not a template

Resolution Status : These issues has been resolved in the Intel® C++ Composer XE 2011 Update 6. Note that using update 6 is a significant compiler upgrade from previous updates.

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This article applies to: Intel® C++ Compiler for Linux* Knowledge Base

For more complete information about compiler optimizations, see our Optimization Notice.

Comments (4)

July 18, 2011 11:57 AM PDT

davehomiak

What is the status of this issue. I am evaluating icpc (ICC) 12.0.4 20110427, and see that the following bug was fixed:

DPD200165009 C++ gcc* 4.5 error: GNU C++ allows C++0x list initializers in non-C++0x modes

but I am still getting errors using gcc 4.5.1 headers like this:

error: hash is not a template
struct hash<test::math::framework::PriceDouble>

so, it fits the description mentioned above. Can you give any estimate of when this will be fixed?

Thanks.

July 18, 2011 12:08 PM PDT

davehomiak

Forgot to point out in my first post that this error is in my code, not a gcc header, and a variadic template is not involved.

August 1, 2011 10:04 AM PDT

Brandon Hewitt (Intel)

Total Points:
9,193

Brown Belt

Hi Dave,

Unfortunately I can't comment on future product plans, but we are taking this compatibility problem seriously and are working on a fix.

January 7, 2012 4:05 PM PST

Sergey Kostrov

Total Points:
27,159

Brown Belt

That's a very interesting to learn.

But, to be honest, I will resist to ANY attempt of using 'variadic templates' on our 95%-C++-templates-based project. Why? Because of portability issues with some older C/C++ compilers currently used on the project.

Best regards,
Sergey