Bug 389631 - net-snmp: invalid lvalue in assignment
net-snmp: invalid lvalue in assignment
Product: Fedora
Classification: Fedora
Component: net-snmp (Show other bugs)
All Linux
low Severity high
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Assigned To: Jan Safranek
Fedora Extras Quality Assurance
: Regression
Depends On:
Blocks: 219025
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Reported: 2007-11-18 13:55 EST by Bernard Johnson
Modified: 2007-11-30 17:12 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2007-11-19 09:59:23 EST
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Description Bernard Johnson 2007-11-18 13:55:43 EST
Description of problem:
Build against net-snmp-devel terminates with "invalid lvalue in assignment"

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. wget http://bjohnson.fedorapeople.org/ntop-3.3-3.fc8.src.rpm
2. koji build --scratch dist-f8-updates-candidate ntop-3.3-3.fc8.src.rpm
Actual results:

Expected results:
clean build

Additional info:
This is a regression from F7.
Comment 1 Jan Safranek 2007-11-19 09:30:34 EST
The memory deallocation in ntop collides with the one in net-snmp and new gcc.
After all macros are expanded I get in containers.h:440:

if (((void *)0) != x->container_name)
  do { 
    if (x->container_name) { 
        void *__t = ((void *)x->container_name);
"/usr/include/net-snmp/library/container.h", 440); 
        (void *)x->container_name = __t;
      x->container_name=((void *)0); 
  } while(0);

I do not see anything wrong at the first sight, I'll try to investigate it. The
code is perfectly compilable with gcc in Fedora 7.
Comment 2 Jan Safranek 2007-11-19 09:59:23 EST
The line "(void *)x->container_name = __t;" is syntactically wrong, cast (void*)
does not result in l-value, see ISO C, section 6.5.4, 

You redefine free() and you assume that the value passed there is l-value, but
net-snmp passes r-value -> compilation error. Your free() should accept r-value
instead, as usual function call.
Comment 3 Bernard Johnson 2007-11-19 17:30:34 EST
Thanks for your very timely response.  I'll try to get that fixed.

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