702090 - compilation error: pkcs11n.h:365:26: error: "__GNUC_MINOR" is not defined

Status: RESOLVED FIXED

(NSS :: Libraries, defect, P2)

Description

[Stefan Becker]

PROBLEM:

A pidgin-sipe user complained about compilation errors when he compiled it against NSS 3.13.1 on OpenSuse 11.4. Here are the important bits from the GCC command line:

gcc ... -Werror -Wall -Wextra -Waggre gate-return -Wcast-align -Wdeclaration-after-statement -Winit-self -Wmissing-dec larations -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wundef ... -I/usr/include/nss3 -I/usr/include/nspr4 ... -c sipe-cert-crypto-nss.c 
cc1: warnings being treated as errors
In file included from /usr/include/nss3/pkcs11t.h:1780:0,
                           from /usr/include/nss3/keythi.h:41,
                           from /usr/include/nss3/keyt.h:41,
                           from /usr/include/nss3/cert.h:55,
                           from sipe-cert-crypto-nss.c:29:
 /usr/include/nss3/pkcs11n.h:365:26: error: "__GNUC_MINOR" is not defined

The same code compiles fine with NSS < 3.13.


ROOT CAUSE:

In 3.13.1 pkcs11n.h has this construct:

#if __GNUC__ > 3
...
#if (__GNUC__ == 4) && (__GNUC_MINOR < 5)
...
#else

which is clearly incorrect. It assumes __GNUC__ is defined, i.e. GCC, and __GNUC_MINOR is a typo.


PROPOSED FIX:

pkcs11n.h should have instead:

#if defined(__GNUC__) && (__GNUC__ > 3)
...
#if (__GNUC__ == 4) && (__GNUC_MINOR__ < 5)
...
#else

That should work with all compilers and fix the __GNUC_MINOR__ typo.

Comment 1

[Stefan Becker]

The problem was introduced in v1.22 with the fix for bug #642503.

See comment: https://bugzilla.mozilla.org/show_bug.cgi?id=642503#c20

Comment 2

[Robert Relyea]

Elio, this looks like the same issue you are dealing with.

The reason we don't trip over the undefines is we don't flip the flag to make undefined comparisons an error.

Also we currently only have built this with GCC 3.x or GCC 4.5 or greater. This patch will allow GCC 4.1, for instance, to work correctly.

bob

Comment 3

[Takanori MATSUURA]

Attachment: fix

Prepare a patch what comment 0 says.

Comment 4

[Kai Engert (:KaiE:)]

Comment on attachment 575453 [details] [diff] [review]
fix

This is obviously correct. r=kaie

Comment 5

[Kai Engert (:KaiE:)]

checked in

Checking in pkcs11n.h;
/cvsroot/mozilla/security/nss/lib/util/pkcs11n.h,v  <--  pkcs11n.h
new revision: 1.27; previous revision: 1.26
done

Comment 6

[Wan-Teh Chang]

The test
    #if __GNUC__ > 3
is correct even if __GNUC__ is not defined.  The C preprocessor
replaces an undefined macro with 0L in a conditional expression.
So if __GNUC__ is not defined, the test
    #if __GNUC__ > 3
will fail, which is the expected result.

Comment 7

[Stefan Becker]

(In reply to Wan-Teh Chang from comment #6)
> The test
>     #if __GNUC__ > 3
> is correct even if __GNUC__ is not defined.

You are missing the point. Any non-GCC compiler that has the equivalent of GCCs "-Werror -Wundef" will not compile this statement. ARM RVCT would be one example.