c/3879: -I/usr/include change compiler behavior to something like -pedantic-errors

Mon Jul 30 09:16:00 GMT 2001

>Number:         3879
>Category:       c
>Synopsis:       -I/usr/include change compiler behavior to something like -pedantic-errors
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 30 09:16:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     "Arkadi E. Shishlov" <arkadi@it.lv>
>Release:        gcc version 3.1 20010730 (experimental)
>Organization:
>Environment:
Native i586-pc-linux-gnu compiler wiith Glibc 2.2.2.
>Description:
GCC fails to compile in presence of -I/usr/include flag.
Example:
lithium(/1)arkadi:~/tmp> cat s.c                                                                                #include <stdlib.h>
char *malloc();
lithium(/1)arkadi:~/tmp> ../opt/gcc-3_0-branch-010730/bin/i586-pc-linux-gnu-gcc -o s.o s.c -c               
lithium(/1)arkadi:~/tmp> ../opt/gcc-3_0-branch-010730/bin/i586-pc-linux-gnu-gcc -o s.o s.c -c -I/usr/include
cc1: warning: changing search order for system directory "/usr/include"
cc1: warning:   as it has already been specified as a non-system directory
s.c:2: conflicting types for `malloc'
/usr/include/stdlib.h:528: previous declaration of `malloc'
lithium(/1)arkadi:~/tmp> 
Same problem with 2.95.x series.
Here is the full output:
lithium(/1)arkadi:~/tmp> ../opt/gcc-3_0-branch-010730/bin/i586-pc-linux-gnu-gcc -o s.o s.c -c -I/usr/include -v -save-temps
Reading specs from ../opt/gcc-3_0-branch-010730/bin/../lib/gcc-lib/i586-pc-linux-gnu/3.1/specs
Configured with: /home/arkadi/work/gnu/gcc/configure --prefix=/home/arkadi/opt/gcc-3_0-branch-010730 --enable-shared --with-gnu-as --with-gnu-ld --enable-threads --enable-languages=c++,java,objc : (reconfigured) 
Thread model: posix
gcc version 3.1 20010730 (experimental)
 ../opt/gcc-3_0-branch-010730/bin/../lib/gcc-lib/i586-pc-linux-gnu/3.1/cpp0 -lang-c -v -I/usr/include -iprefix ../opt/gcc-3_0-branch-010730/bin/../lib/gcc-lib/i586-pc-linux-gnu/3.1/ -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i586__ -D__tune_pentium__ s.c s.i
GNU CPP version 3.1 20010730 (experimental) (cpplib) (i386 Linux/ELF)
ignoring nonexistent directory "../opt/gcc-3_0-branch-010730/i586-pc-linux-gnu/include"
ignoring nonexistent directory "/home/arkadi/opt/gcc-3_0-branch-010730/i586-pc-linux-gnu/include"
ignoring duplicate directory "/home/arkadi/opt/gcc-3_0-branch-010730/lib/gcc-lib/i586-pc-linux-gnu/3.1/include"
cpp0: warning: changing search order for system directory "/usr/include"
cpp0: warning:   as it has already been specified as a non-system directory
ignoring duplicate directory "/usr/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include
 ../opt/gcc-3_0-branch-010730/lib/gcc-lib/i586-pc-linux-gnu/3.1/include
 /home/arkadi/opt/gcc-3_0-branch-010730/include
End of search list.
 ../opt/gcc-3_0-branch-010730/bin/../lib/gcc-lib/i586-pc-linux-gnu/3.1/cc1 -fpreprocessed s.i -quiet -dumpbase s.c -version -o s.s
GNU CPP version 3.1 20010730 (experimental) (cpplib) (i386 Linux/ELF)
GNU C version 3.1 20010730 (experimental) (i586-pc-linux-gnu)
        compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81).
s.c:2: conflicting types for `malloc'
/usr/include/stdlib.h:528: previous declaration of `malloc'
lithium(/1)arkadi:~/tmp> 

Diff'ing the saved s.i files for both cases shows only differenecs like this:
24,25c24,25
< # 34 "/usr/include/stdlib.h" 2
< # 94 "/usr/include/stdlib.h"
---
> # 34 "/usr/include/stdlib.h" 2 3
> # 94 "/usr/include/stdlib.h" 3

The bad s.i is attached.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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