Re: [Bug-apl] errors building gnu-apl 1.7

[Jeff Derby]

Jürgen,

thanks very much for the response.  the
Apple tools use clang, and it may be that clang used as gcc (or g++) is
much more picky than gcc (or g++) itself

i did 'svn co svn://svn.savannah.gnu.org/apl'
(so apparently with an empty modulename)
so i have subdirectories for apl-1.0
through apl-1.7, and one for 'trunk'.  
do i build in the 'trunk' subdirectory?

thanks

Jeff H. Derby
Senior Technical Staff Member
Next Generation Computing
IBM Research
------
IBM Corporation
RTP, NC  USA
Cell: (919) 672-0962
Internet:  address@hidden



From:      
 "Dr. Jürgen Sauermann"
<address@hidden>
To:      
 Jeff Derby <address@hidden>,
address@hidden
Date:      
 04/24/2019 12:45
Subject:    
   Re: [Bug-apl]
errors building gnu-apl 1.7

---

Hi Jeff,

the warning regarding -Wconstant-logical-operandis bogus. I have nevertheless
updated the sources; the line now reads:

ostream * log = (LOG_startup != 0 || LOG_Svar_DB_signals != 0) ? &
cerr : 0;

You can either fix that line manually, or update to the latest SVN version
1138 where the
line is corrected.

The sirst two warnings (-Wnull-dereference) are a little obscure
since the indicated
line numbers in ScalarFunction.cc do not show anything close to
the printout of the error.

This could have two reasons:

A. you compile a rather old version of GNU APL (for examle the one stored
on the GNU mirrors).
In that case I would recommend to fetch the GNU APL code from our SVN repository
at savannah
(see https://savannah.gnu.org/svn/?group=aplwith an empty modulename).

B. your compiler expands some macros somewhere and displays the expaneded
text while
loosing track of the source code lines. In that case I would disable this
particular warning
(reconfigure the sources with something like:

CXXFLAGS = -Wnonull-dereference ./configure

). I believe these 2 warning are also not significant.

Best Regards,
Jürgen


On 4/24/19 5:01 PM, Jeff Derby wrote:
this was on a Mac running macOS 10.14.4
using Apple's command line tools:
-----------------
l-Svar_record.o `test -f 'Svar_record.cc' || echo './'`Svar_record.cc
ScalarFunction.cc:97:14: error: binding dereferenced null pointer to reference
has undefined behavior [-Werror,-Wnull-dereference]
   : value_Z(*(Value *)0),
             ^~~~~~~~~~~
ScalarFunction.cc:159:14: error: binding dereferenced null pointer to reference
has undefined behavior [-Werror,-Wnull-dereference]
   : value_Z(*(Value *)0),
             ^~~~~~~~~~~
2 errors generated.
make[3]: *** [apl-ScalarFunction.o] Error 1
make[3]: *** Waiting for unfinished jobs....
Svar_DB.cc:302:30: error: use of logical '||' with constant operand [-Werror,-Wconstant-logical-operand]
ostream * log = (LOG_startup || LOG_Svar_DB_signals) ? & cerr : 0;
                     
       ^  ~~~~~~~~~~~~~~~~~~~
Svar_DB.cc:302:30: note: use '|' for a bitwise operation
ostream * log = (LOG_startup || LOG_Svar_DB_signals) ? & cerr : 0;
                     
       ^~
                     
       |
1 error generated.
make[3]: *** [apl-Svar_DB.o] Error 1
mv -f .deps/apl-StateIndicator.Tpo .deps/apl-StateIndicator.Po
mv -f .deps/apl-Svar_record.Tpo .deps/apl-Svar_record.Po
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
---------------

should i just turn off treating warnings as errors?

thanks

Jeff H. Derby
IBM Corporation
RTP, NC  USA
Cell: (919) 672-0962
Internet:  address@hidden