RFR 8037825 Fix warnings and enable "warnings as errors" in serviceability native libraries

[Staffan Larsen]

Erik, Magnus,

Thanks for the quick looks. Here is an updated version that adds the new variable to flags.m4 instead.

http://cr.openjdk.java.net/~sla/8037825/webrev.01/root/
http://cr.openjdk.java.net/~sla/8037825/webrev.01/jdk/

Thanks,
/Staffan

On 19 mar 2014, at 14:03, Erik Joelsson <erik.joelsson at oracle.com> wrote:

> Hello,
> 
> Nice work! Removing warnings and enforcing them is definitely something we like.
> 
> For the makefile change, ideally the new variable WARNINGS_ARE_ERRORS should be set in configure. I would suggest flags.m4, in FLAGS_SETUP_COMPILER_FLAGS_MISC. Also, instead of making the conditional on OS, it should be on the new variable TOOLCHAIN_TYPE. Perhaps the variable name should contain the word CFLAGS somewhere to make it more obvious what it applies to.
> 
> /Erik
> 
> On 2014-03-19 13:30, Staffan Larsen wrote:
>> The serviceability libraries (as defined by jdk/make/lib/ServiceabilityLibraries.gmk) should be compiled with "warnings as errors". To enable this all current warnings need to be fixed.
>> 
>> The background for this is that we recently had a bug that could have easily been avoided if we had paid attention to the warnings.
>> 
>> webrev: http://cr.openjdk.java.net/~sla/8037825/webrev.00/
>> bug: https://bugs.openjdk.java.net/browse/JDK-8037825
>> 
>> Thanks,
>> /Staffan
>> 
>> 
>> Here is a list of warnings that I have fixed:
>> 
>> linux-i586
>> 
>> jdk/src/share/back/eventHandler.c: In function 'eventHandler_createPermanentInternal':
>> jdk/src/share/back/eventHandler.c:1685: error: cast from pointer to integer of different size
>> jdk/src/share/back/eventHandler.c: In function 'eventHandler_createInternalThreadOnly':
>> jdk/src/share/back/eventHandler.c:1694: error: cast from pointer to integer of different size
>> 
>> jdk/src/share/back/inStream.c: In function 'inStream_readLong':
>> jdk/src/share/back/inStream.c:147: error: integer constant is too large for 'long' type
>> 
>> 
>> macosx
>> 
>> jdk/src/share/back/SDE.c:51:1: warning: "true" redefined
>> jdk/src/share/back/SDE.c:52:1: warning: "false" redefined
>> 
>> jdk/src/share/back/log_messages.c: In function ‘get_time_stamp’:
>> jdk/src/share/back/log_messages.c:69: warning: format not a string literal, argument types not checked
>> jdk/src/share/back/log_messages.c: In function ‘log_message_end’:
>> jdk/src/share/back/log_messages.c:174: warning: cast from pointer to integer of different size
>> 
>> jdk/src/solaris/native/sun/management/MacosxOperatingSystem.c: In function 'Java_sun_management_OperatingSystemImpl_getProcessCpuLoad0':
>> jdk/src/solaris/native/sun/management/MacosxOperatingSystem.c:136: warning: implicit declaration of function 'JVM_ActiveProcessorCount'
>> 
>> 
>> windows
>> 
>> jdk/src/share/back/error_messages.c(328) : warning C4996: '_sleep': This function or variable has been superceded by newer library or operating system functionality. Consider using Sleep instead. See online help for details.
>> 
>> jdk/src/windows/back/linker_md.c(62) : warning C4013: 'free' undefined; assuming extern returning int
>> 
>> jdk/src/share/instrument/PathCharsValidator.c(49) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
>> jdk/src/share/instrument/PathCharsValidator.c(62) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
>> jdk/src/share/instrument/PathCharsValidator.c(179) : warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
>> 
>> 
>> solaris-x64
>> 
>> jdk/src/share/back/inStream.c, line 147: constant promoted to unsigned long long
>