Bug 61066

Summary: cpp version 2.96 does not warn on macro redefinition
Product: [Retired] Red Hat Linux Reporter: neal nuckolls <nn>
Component: cppAssignee: Jakub Jelinek <jakub>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 7.2   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2002-12-15 19:30:22 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description neal nuckolls 2002-03-12 23:06:50 UTC 
Description of Problem:
All C preprocessors prior to 2.96 that I've ever used will warn
whenever a cpp macro is redefined to a "non-trivial" different value.
Not 2.96 .  The 2.96 cpp does not produce a warning for this
unless you set the -pedantic option.
This is inconsistent with the cpp documentation which explicitly says
that cpp macro redefines produce a warning period.
Please fix.

Version-Release number of selected component (if applicable):
# cpp -dumpversion
2.96

How Reproducible:
Totally.
The cpp in the i386 C toolchain that came with RedHat 6.0
does not have this problem.

Steps to Reproduce:
1. Create a file containing the two lines:
#define	FOO	1
#define	FOO	2
2. compile it on redhat 7.2 "cc -c t.c" -- no warnings
3. compile it on an older redhat release like 6.2, viola warnings.
(cpp -dumpversion on that system says "egcs-2.91.66").

Actual Results:


Expected Results:


Additional Information:
Comment 1 Alan Cox 2002-12-15 19:30:22 UTC 
Tested and warns fine on gcc 3.2