New GNU compiler causing compilation errors

[tpilz]

Hi David, I recently updated my computer which brought some problems which ECHSE. I think the behaviour of the GNU compiler must have changed. I am using version 7.1.1 20170530.

Problem 1: Nonconforming code When compiling any ECHSE angine I get the following error and note related to the generic code:

/home/tobias/apps/echse/echse_generic//core/echse_coreFunct_main.cpp: In function ‘int main(int, const char**)’: /home/tobias/apps/echse/echse_generic//core/echse_coreFunct_main.cpp:613:13: error: redeclaration of ‘except e’ [-fpermissive] except e(__PRETTY_FUNCTION__,errmsg,__FILE__,__LINE__); ^ /home/tobias/apps/echse/echse_generic//core/echse_coreFunct_main.cpp:608:22: note: ‘std::exception e’ previously declared here } catch (exception e) { Regarding -fpermissive, the compiler doc says:

Downgrade some diagnostics about nonconformant code from errors to warnings. Thus, using -fpermissive will allow some nonconforming code to compile.

That means, the compiler option -fpermissive would downgrade the error to a warning. But still I wonder why that never was an issue before. Any ideas?

Problem 2: Using namespace std This problem is related to the std namespace. This is declared for the main function, i.e. in echse_coreFunct_main.cpp, line 41: using namespace std; In my user-specific code I am using the function accumulate() of the std namespace. In doing so I never had problems before but now the compilation results in error: ‘accumulate’ was not declared in this scope double vect_sum = accumulate(w_eta_t.begin(), w_eta_t.end(), 0.); I found the following discussion on stackoverflow: stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice. They are saying, using namespace std; is considered bad practise and one should raher use std::<object name>.

However, I wonder why that compilation error never appeared before and why the compiler is not complaining about other occurences where std objects are used. Have you observed similar issues?

Cheers, Tobias

[echse]

Hi Thomas,

the first issue should have been resolved by the latest update of 'echse_coreFunct_main.cpp'. IMO, it was indeed inconsistent code.

Regarding the second issue, I have no idea. But I agree that always using std::

[tpilz]

Thanks David. Strange that the older compiler versions never complained.

You said you are still getting errors with Ubuntu? I switched to Ubuntu 16.04 LTS as well (due to some others problems with the recent opensuse version) but it seems to be fine. I only cannot get the GSL library running on it (to choose from various ODE solvers within my ECHSE implementations that are not finished yet) but this is another story...

[tpilz]

Ok, the GSL issue has been solved as well. The problem was an error in the order how GSL had been included during compilation, see https://stackoverflow.com/questions/45135/why-does-the-order-in-which-libraries-are-linked-sometimes-cause-errors-in-gcc

Still I wonder why this never was an issue before...