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

[Erik Joelsson]

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