Re: how to build c++

[Dirk Zimoch <dirk.zimoch@psi.ch>]

Andrew Johnson wrote:
> On Tuesday 29 March 2011 07:11:57 yangyong203 wrote:
> > My error messages as follow:
> > -------------------------------------------------------------------
> > /usr/bin/g++ -c  -D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS
> > -D_XOPEN_SOURCE=500           -D_X86_  -DUNIX  -D_BSD_SOURCE -Dlinux 
> > -D_REENTRANT   -O3   -Wall      -m32     -g -fPIC -I. -I../O.Common -I.
> > -I.. -I../../../include/os/Linux -I../../../include
> > -I/epics0320/base/include/os/Linux -I/epics0320/base/include       
> > ../dbSubExample.cpp
> > In file included from ../dbSubExample.cpp:6:
> > /epics0320/base/include/aSubRecord.h:163: error: expected unqualified-id
> > before ‘!’ token
> > ---------------------------------------------------------
>
> Ah, this is a very specific problem with the aSub record, which contains a 
> field named 'NOT', which becomes a structure data member 'not'.  The word 
> 'not' is a reserved word in C++ (which the compiler has replaced with the 
> synonym '!' in the above error message) but not in C, thus the dbSubExample.c 
> file compiles but it doesn't if you rename it and try to use the C++ compiler.
>
> There is a very simple fix though: Insert the following macro definition into 
> your dbSubExample.cpp file before the #include <aSubRecord.h> line:
> 	#define not no_t
> This will change the name that the C++ compiler sees for that data member into 
> something that it accepts, and the result should then compile properly.
>
> - Andrew

... or add CXXFLAGS+=-fno-operator-names to one of the used CONFIG.* files.

Dirk