[Rev 02] RFR: 8241476: Linux build warnings issued on gcc 9

[Thiago Milczarek Sayao]

On Wed, 8 Apr 2020 18:34:56 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Sep cppFlags and cFlags
>
> The build changes in `linux.gradle` look good. I tested it, and all warnings are gone (including those in WebKit)
> except for the ones in the jfxmedia sub-project of javafx.media.
> Two comments:
> 
> 1. I changed the bug title in JBS to refer to gcc 9 rather than Ubuntu to reflect the actual cause of the additional
> warnings. Can you update the title of this PR to match? 8241476: Linux build warnings issued on gcc 9
> 
> 2. Can you add the following change to your PR as well? This will fix the remaining warnings in jfxmedia:
> 
> --- a/modules/javafx.media/src/main/native/jfxmedia/projects/linux/Makefile
> +++ b/modules/javafx.media/src/main/native/jfxmedia/projects/linux/Makefile
> @@ -41,7 +41,6 @@ ifdef HOST_COMPILE
>                    -Wextra \
>                    -Wformat-security \
>                    -fstack-protector \
> -                  -Werror=implicit-function-declaration \
>                    -Werror=trampolines \
>                   -msse2 \
>                   -DGSTREAMER_LITE

Done.

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PR: https://git.openjdk.java.net/jfx/pull/150