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  1. MariaDB Server
  2. MDEV-27910

Internal compiler error on CentOS 7 ARMv8 GCC 4.8.5

Details

    Description

      The ancient GCC 4.8.5 cannot create ARMv8 code again, starting with MDEV-27774:

      10.8 a635c40648519fd6c3729c9657872a16a0a20821

      		 
      /home/buildbot/aarch64-centos-7-bintar-initd/build/storage/innobase/buf/buf0flu.cc: In function 'void buf_flush_page_cleaner()':
      		 
      /home/buildbot/aarch64-centos-7-bintar-initd/build/storage/innobase/buf/buf0flu.cc:2400:1: error: could not split insn
      		 
       }
      		 
       ^
      		 
      …
      		 
      /home/buildbot/aarch64-centos-7-bintar-initd/build/storage/innobase/buf/buf0flu.cc:2400:1: internal compiler error: in final_scan_insn, at final.c:2897
      		 
      Please submit a full bug report,
      		 
      with preprocessed source if appropriate.
      		 
      See <http://bugzilla.redhat.com/bugzilla> for instructions.
      		 
      Preprocessed source stored into /tmp/ccNWcq6g.out file, please attach this to your bugreport.

      If I remember correctly, Red Hat would tell that GCC 4.8.5 is not supported anymore. So, we will probably have to add some work-around like in MDEV-26467 in order to disable some optimizations when targeting ARMv8 with GCC 4.8.5.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27774 Reduce scalability bottlenecks in mtr_t::commit()

          • Major - Major loss of function.
          • Closed

          Activity

            marko Marko Mäkelä added a comment -

            It was not sufficient to use

            # pragma GCC optimize ("no-expensive-optimizations")

            but the compilation did succeed with the following:

            # pragma GCC optimize ("O0")

            All subsequent code in the file will be compiled in this mode on GCC 4.8.5 for ARMv8, because that old GCC does not support #pragma GCC diagnostic push.

            marko Marko Mäkelä added a comment - It was not sufficient to use # pragma GCC optimize ("no-expensive-optimizations") but the compilation did succeed with the following: # pragma GCC optimize ("O0") All subsequent code in the file will be compiled in this mode on GCC 4.8.5 for ARMv8, because that old GCC does not support #pragma GCC diagnostic push .

            People

              marko Marko Mäkelä
              marko Marko Mäkelä
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                Created:
                Updated:
                Resolved:

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