[Bug 238538] devel/elfutils: fails to build with GCC 9+: libelfP.h:47:30: error: '__elf32_msize' specifies less restrictive attribute

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238538

            Bug ID: 238538
           Summary: devel/elfutils: fails to build with GCC 9+:
                    libelfP.h:47:30: error: '__elf32_msize' specifies less
                    restrictive attribute
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: cem at freebsd.org
          Reporter: gerald at FreeBSD.org
            Blocks: 238330
          Assignee: cem at freebsd.org
             Flags: maintainer-feedback?(cem at freebsd.org)

Building elfutils with GCC 9 instead of older versions results in on
amd64 platforms:

In file included from ../config.h:132,
                 from elf32_fsize.c:31:
libelfP.h:47:30: error: '__elf32_msize' specifies less restrictive attribute
than its target 'elf32_fsize': 'const' [-Werror=missing-attributes]
   47 | #define __elfw2_(Bits, Name) __elf##Bits##_##Name
      |                              ^~~~~

This currently blocks the update of GCC_DEFAULT to that newer version,
cf. PR 238330.


Logs at

http://package22.nyi.freebsd.org/data/112amd64-default-PR238330/2019-06-09_20h29m30s/logs/errors/elfutils-0.174_2.log

http://package18.nyi.freebsd.org/data/120amd64-default-PR238330/2019-06-09_20h26m27s/logs/errors/elfutils-0.174_2.log


https://gcc.gnu.org/gcc-9/porting_to.html and the general release notes
https://gcc.gnu.org/gcc-9/changes.html may prove useful.


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238330
[Bug 238330] [exp-run] Update GCC_DEFAULT from 8 to 9
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