Project

General

Profile

Support #632

MacOSX: many warnings with compiler CLANG/LLVM when compiling BOOST code.

Added by John Abbott over 9 years ago. Updated over 1 year ago.

Status:
Closed
Priority:
Normal
Assignee:
John Abbott
Category:
Portability
Target version:
CoCoA-5.1.3/4 Jan 2016
Start date:
03 Oct 2014
Due date:
% Done:

100%

Estimated time:
Spent time:
2.20 h

Description

Recent MacOSX compilers produce lots of (spurious?) warnings when compiling BOOST code.

The warnings can be suppressed by adding the flag -Wno-c99-extensions to CXXFLAGS_CUSTOM on line 3 of src/CoCoA-5/Makefile

Related issues

Related to CoCoALib - Support #1700: boost_1_80_0Closed2022-10-14

History

#1 Updated by John Abbott over 9 years ago

Currently the edit has to be done by hand.

Is it worth trying to add the flag automatically? (e.g. during configuration?)

The BOOST people are aware of the problem; so hopefully they will sort it out (or maybe the CLANG/LLVM people will find a solution)

Perhaps we should add a comment to documentation somewhere; it is quite alarming to see all the warning messages scroll by.

#2 Updated by John Abbott over 9 years ago

I have revised some impls in CoCoALibSupplement.C to avoid some warnings by Clang/LLVM; the problem derived from the fact that the compiler did not know that CoCoA_ERROR does not return.

In some ways the new code might even be more readable than the old. Anyway, all tests pass, and I have checked in.

#3 Updated by John Abbott over 8 years ago

  • Status changed from New to In Progress
  • Assignee set to John Abbott
  • Target version changed from CoCoA-5.1.2 summer 2015 to CoCoA-5.1.3/4 Jan 2016
  • % Done changed from 0 to 50

Is this really our problem? Morally speaking, I'd say not; in practice, it is.

I have added a note to the installation instructions (i.e. doc/txt/INSTALL.txt and doc/html/INSTALL.html) saying that compiler warnings should just be ignored.

I'm not sure whether the workaround suggested in the description is worth implementing... after all, if the BOOST people and the llvm people can come to an amicable agreement then the issue should simply go away... (it is really their problem).

#4 Updated by John Abbott over 8 years ago

This issue was originally raised by Laura Torrente (on 2 Oct 2014, via email).

#5 Updated by John Abbott about 8 years ago

  • Status changed from In Progress to Closed
  • Target version changed from CoCoA-5.1.3/4 Jan 2016 to CoCoA-5.?.?
  • % Done changed from 50 to 100

Closing this issue because I think we have already done all that is reasonable. Maybe the problem will go away completely when we switch to C++11?

#6 Updated by Redmine Admin over 6 years ago

  • Target version changed from CoCoA-5.?.? to CoCoA-5.1.3/4 Jan 2016

#7 Updated by Anna Maria Bigatti over 1 year ago

#8 Updated by Anna Maria Bigatti over 1 year ago

  • Subject changed from MacOSX: many warnings with compiler CLANG/LLVM to MacOSX: many warnings with compiler CLANG/LLVM when compiling BOOST code.

Also available in: Atom PDF