RFR [XS] jdk11 - 8234809: set relro in linker flags when building with gcc

[Lindenmaier, Goetz]

Hi Matthias,

change looks good. 

The context is different because "8209817: stack is executable when 
building with Clang on Linux" is missing in 11. This is a special build fix 
for google.

Best regards,
  Goetz.

> -----Original Message-----
> From: jdk-updates-dev <jdk-updates-dev-bounces at openjdk.java.net> On
> Behalf Of Baesken, Matthias
> Sent: Donnerstag, 19. Dezember 2019 14:58
> To: jdk-updates-dev at openjdk.java.net; 'build-dev at openjdk.java.net' <build-
> dev at openjdk.java.net>
> Cc: Zeller, Arno <arno.zeller at sap.com>
> Subject: [CAUTION] RFR [XS] jdk11 - 8234809: set relro in linker flags when
> building with gcc
> 
> Hello,  please review  the jdk11 downport of  8234809 .
> 
> The patch form jdk/jdk  did not apply  directly   so  make/autoconf/flags-
> ldflags.m4   had to be adjusted a little bit for jdk11 .
> 
> Original discussion :
> 
> https://mail.openjdk.java.net/pipermail/build-dev/2019-
> November/026347.html
> 
> +
> 
> https://mail.openjdk.java.net/pipermail/build-dev/2019-
> November/026365.html
> 
> 
> 
> Bug/ jdk11 webrev :
> 
> https://bugs.openjdk.java.net/browse/JDK-8234809
> 
> http://cr.openjdk.java.net/~mbaesken/webrevs/8234809_jdk11.0/
> 
> Thanks, Matthias