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

[Magnus Ihse Bursie]

On Fri, 5 Feb 2021 10:28:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> 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

Marked as reviewed by ihse (Reviewer).

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