RFR: 8261211: Zero: alpha builds fail with '-fstack-protector not supported for this target' [v2]

[Aleksey Shipilev]

> Configuration summary:
> * Name: linux-alpha-zero-slowdebug
> * Debug level: slowdebug
> * HS debug level: debug
> * JVM variants: zero
> * JVM features: zero: 'epsilongc g1gc jni-check jvmti management nmt parallelgc serialgc services vm-structs zero'
> * OpenJDK target: OS: linux, CPU architecture: alpha, address length: 64
> * Version string: 17-internal+0-adhoc.shade.jdk (17-internal)
> 
> Tools summary:
> * Boot JDK: openjdk version "15-testing" 2020-09-15 OpenJDK Runtime Environment (build 15-testing+0-builds.shipilev.net-openjdk-jdk15-b17-20201010) OpenJDK 64-Bit Server VM (build 15-testing+0-builds.shipilev.net-openjdk-jdk15-b17-20201010, mixed mode, sharing) (at /home/shade/Install/jdk15.0.2-ea)
> * Toolchain: gcc (GNU Compiler Collection)
> * C Compiler: Version 9.3.0 (at /usr/bin/alpha-linux-gnu-gcc)
> * C++ Compiler: Version 9.3.0 (at /usr/bin/alpha-linux-gnu-g++)
> 
> $ CONF=linux-alpha-zero-fastdebug make hotspot
> 
> * For target hotspot_variant-zero_libjvm_objs_cardTable.o:
> cc1plus: error: '-fstack-protector' not supported for this target [-Werror]
> cc1plus: all warnings being treated as errors
> 
> JDK-8199405 removed the conditional checks for -fstack-protector availability. I believe the intent was to trust that every recent GCC has this option. But this issue shows that stack-protector support is also arch-specific?
> 
> Linux x86_64 server configure now says:
> 
> checking if CC supports "-fstack-protector -Werror"... yes
> checking if CXX supports "-fstack-protector -Werror"... yes
> checking if both CC and CXX support "-fstack-protector -Werror"... yes
> 
> Linux Zero alpha configure now says:
> 
> checking if CC supports "-fstack-protector -Werror"... no
> checking if CXX supports "-fstack-protector -Werror"... no
> checking if both CC and CXX support "-fstack-protector -Werror"... no
> 
> Additional testing:
>  - [x] Linux Zero alpha {release,fastdebug,slowdebug} cross-compilation
>  - [x] Eyeballing configure logs for Linux Zero {alpha, x86_64}

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Drop -Werror

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2423/files
  - new: https://git.openjdk.java.net/jdk/pull/2423/files/9890bcfa..5e8fe67d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2423&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2423&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2423.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2423/head:pull/2423

PR: https://git.openjdk.java.net/jdk/pull/2423