<AWT Dev> RFR : 8227737: avoid implicit-function-declaration on AIX

[Baesken, Matthias]

Thanks !


  *   How far are we then from enabling "warnings as errors" on AIX? :P
  *

I count  in the opt/product  jdk/jdk AIX   build  currently   60  remaining  matches  of compiler warnings .

Plus additionally  a number of those (probably linker warnings ?) :
1500-029: (W) WARNING: subprogram ...  could not be inline

Guess we have to suppress  / ignore   at least most of the linker  inlining warnings   (we ignore them for a decade IMHO).


>From the  60 remaining compiler warnings   I mentioned  are  ~ 30 of type Wformat :

warning: format specifies type 'int *' but the argument has type 'int' [-Wformat]
warning: format specifies type 'unsigned long long' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]

Guess those can the easily fixed (and should be fixed).

Regards, Matthias


From: Langer, Christoph
Sent: Mittwoch, 17. Juli 2019 09:40
To: Baesken, Matthias <matthias.baesken at sap.com>; Java Core Libs <core-libs-dev at openjdk.java.net>; nio-dev at openjdk.java.net; net-dev at openjdk.java.net; awt-dev at openjdk.java.net
Cc: 'ppc-aix-port-dev at openjdk.java.net' <ppc-aix-port-dev at openjdk.java.net>
Subject: RE: RFR : 8227737: avoid implicit-function-declaration on AIX

Hi Matthias,

looks good, thanks for doing this.

How far are we then from enabling "warnings as errors" on AIX? :P

Best regards
Christoph

From: awt-dev <awt-dev-bounces at openjdk.java.net<mailto:awt-dev-bounces at openjdk.java.net>> On Behalf Of Baesken, Matthias
Sent: Dienstag, 16. Juli 2019 17:04
To: Java Core Libs <core-libs-dev at openjdk.java.net<mailto:core-libs-dev at openjdk.java.net>>; nio-dev at openjdk.java.net<mailto:nio-dev at openjdk.java.net>; net-dev at openjdk.java.net<mailto:net-dev at openjdk.java.net>; awt-dev at openjdk.java.net<mailto:awt-dev at openjdk.java.net>
Cc: 'ppc-aix-port-dev at openjdk.java.net' <ppc-aix-port-dev at openjdk.java.net<mailto:ppc-aix-port-dev at openjdk.java.net>>
Subject: [CAUTION] <AWT Dev> RFR : 8227737: avoid implicit-function-declaration on AIX

Hello, please review the following  AIX related change .
It fixes a number of  missing inclusions  leading to  implicit-function-declaration  warnings when compiling  with the recent xlc16 /xlclang .


At various places in the native C coding in jdk, we miss header inclusions on AIX.
This leads to warnings like :

/nightly/jdk/src/java.base/unix/native/libjava/childproc.c:99:5: warning: implicitly declaring library function 'snprintf'
with type 'int (char *, unsigned long, const char *, ...)' [-Wimplicit-function-declaration]
    snprintf(aix_fd_dir, 32, "/proc/%d/fd", getpid());
    ^
/nightly/jdk/src/java.base/unix/native/libjava/childproc.c:99:5: note: include the header <stdio.h> or explicitly provide a declaration for 'snprintf'

or

/nightly/jdk/src/java.base/aix/native/libjli/java_md_aix.c:38:5: warning: implicitly declaring library function 'memset'
with type 'void *(void *, int, unsigned long)' [-Wimplicit-function-declaration]
    memset((void *)info, 0, sizeof(Dl_info));

/nightly/jdk/src/java.base/aix/native/libjli/java_md_aix.c:38:5: note: include the header <string.h> or explicitly provide a declaration for 'memset'



Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8227737

http://cr.openjdk.java.net/~mbaesken/webrevs/8227737.0/


Thanks, Matthias
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