AIX C compiler message unexplainable

[andreas.luethi]

Hi All

Compile a our source with BM XL C/C++ Enterprise Edition V8.0 for AIX
(Version: 08.00.0000.0000 ) produces a lot of Informational message
like this:

"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.

n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.

Appreciate your help in this regard,

Thanks,
Andreas

[jacob navia]

an************@ gmx.net wrote:

Hi All

Compile a our source with BM XL C/C++ Enterprise Edition V8.0 for AIX
(Version: 08.00.0000.0000 ) produces a lot of Informational message
like this:

"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.

n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.

Appreciate your help in this regard,

Thanks,
Andreas

Please go to IBM help desk. We are NOT IBM help desk.

Thanks for your understanding.
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique
http://www.cs.virginia.edu/~lcc-win32

[jacob navia]

an************@ gmx.net wrote:

Hi All

Compile a our source with BM XL C/C++ Enterprise Edition V8.0 for AIX
(Version: 08.00.0000.0000 ) produces a lot of Informational message
like this:

"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.

n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.

Appreciate your help in this regard,

Thanks,
Andreas

P.S. It would be maybe better to SHOW where the compiler
complains, where you think it is wrong with
concrete examples, if not it is not possible to help you
anyway.
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique
http://www.cs.virginia.edu/~lcc-win32

[andreas.luethi]

On Oct 17, 1:13 pm, jacob navia <ja...@nospam.o rgwrote:

andreas.lue...@ gmx.net wrote:

Hi All

Compile a our source with BM XL C/C++ Enterprise Edition V8.0 for AIX
(Version: 08.00.0000.0000 ) produces a lot of Informational message
like this:

"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.

n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.

Appreciate your help in this regard,

Thanks,
Andreas

P.S. It would be maybe better to SHOW where the compiler
complains, where you think it is wrong with
concrete examples, if not it is not possible to help you
anyway.

--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatiquehtt p://www.cs.virginia .edu/~lcc-win32

here is the code snipped:

void aaalib_trim (char *in) {
int n;
for (n = (strlen(in)) - 1; n>= 0; n--)
if (!isspace(in[n]))
break;
in[n+1] = '\0';
}

[Roberto Waltman]

an************@ gmx.net wrote:

>andreas.lue... @gmx.net wrote:

... Informational message
like this:

"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.

n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.

here is the code snipped:

void aaalib_trim (char *in) {
int n;
for (n = (strlen(in)) - 1; n>= 0; n--)
if (!isspace(in[n]))
break;
in[n+1] = '\0';
}

An uneducated guess: the compiler misses the initialization in the
for(..) statement. Try this:

void aaalib_trim (char *in) {
int n = strlen(in) - 1;
for ( ; n>= 0; n--)
if (!isspace(in[n]))
break;
in[n+1] = '\0';
}

strlen(in) is always greater than 1, right? ;)

--
Roberto Waltman

[ Please reply to the group,
return address is invalid ]

[jacob navia]

an************@ gmx.net wrote:

On Oct 17, 1:13 pm, jacob navia <ja...@nospam.o rgwrote:

>andreas.lue... @gmx.net wrote:

>>Hi All
Compile a our source with BM XL C/C++ Enterprise Edition V8.0 for AIX
(Version: 08.00.0000.0000 ) produces a lot of Informational message
like this:
"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.
n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.
Appreciate your help in this regard,
Thanks,
Andreas

P.S. It would be maybe better to SHOW where the compiler
complains, where you think it is wrong with
concrete examples, if not it is not possible to help you
anyway.

--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatiquehtt p://www.cs.virginia .edu/~lcc-win32

here is the code snipped:

void aaalib_trim (char *in) {
int n;
for (n = (strlen(in)) - 1; n>= 0; n--)
if (!isspace(in[n]))
break;
in[n+1] = '\0';
}

If the code is *exactly* as you posted then...
this looks like a bug in IBM's compiler. Note that version
Version: 08.00.0000.0000 is outdated. I have received a patch
after that one.

OR

The warning just says that you reference a variable
that was not initialized at its declaration... This could
be a very misleading warning. Try to do

void aaalib_trim (char *in) {
int n = 78887; // <<<<----- here
for (n = (strlen(in)) - 1; n>= 0; n--)
if (!isspace(in[n]))
break;
in[n+1] = '\0';
}

If the warning disappears it means that this is the case.

--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique
http://www.cs.virginia.edu/~lcc-win32

[jacob navia]

Roberto Waltman wrote:

>
void aaalib_trim (char *in) {
int n = strlen(in) - 1;
for ( ; n>= 0; n--)
if (!isspace(in[n]))
break;
in[n+1] = '\0';
}

strlen(in) is always greater than 1, right? ;)

strlen can be zero. Then, strlen(in)-1 is -1.
Since he tests for n>=0 the loop never gets
executed.
Then, in[n+1] == in[0] == 0 anyway since
strlen gave zero, so he overwrites a zero with a zero,
a harmless operation
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique
http://www.cs.virginia.edu/~lcc-win32

[vipvipvipvip.ru]

void aaalib_trim(cha r *in) {
size_t n = strlen(in);
if(n != 0) {
while(isspace(i n[--n]))
;
in[n+1] = 0;
}
return;
}

The compiler is probably buggy.
If the for loop is the issue, the above code will
compile with no errors.
But i wouldn't use a compiler that cannot properly
parse and check C code..

[David Tiktin]

On 17 Oct 2007, vi************* @gmail.com wrote:

void aaalib_trim(cha r *in) {
size_t n = strlen(in);
if(n != 0) {
while(isspace(i n[--n]))
;

If the string "in" consists of all whitespace, what prevents this loop
from taking a walk in the weeds? What happens when n == 0 and in[0] is
a space? Probably not what you want ;-)

in[n+1] = 0;
}
return;
}

Dave

--
D.a.v.i.d T.i.k.t.i.n
t.i.k.t.i.n [at] a.d.v.a.n.c.e.d .r.e.l.a.y [dot] c.o.m

[J. J. Farrell]

On Oct 17, 11:43 am, andreas.lue...@ gmx.net wrote:

Hi All

Compile a our source with BM XL C/C++ Enterprise Edition V8.0 for AIX
(Version: 08.00.0000.0000 ) produces a lot of Informational message
like this:

"aaalib.c", line 671.1: 1506-412 (I) Referenced variable "n", which
was not initialized in its declaration.

n is a variable in procedure an is assigned before used. Compiling the
same sources with other compiles such as AIX version 7.0, gcc on
linux etc do not display this information.

Appreciate your help in this regard,

What are you looking for help with exactly? The message is nonsense,
but if we replace "declaratio n" with "definition " (which I assume is
what they really meant) then it makes sense. It's a remarkably stupid
thing to inform you about unless you've explicitly asked it to do so,
but the compiler's free to inform you about whatever it likes. It's a
wrongly worded and remarkably silly piece of implementation; I'd
complain to the implementor.