[Bug 226658] devel/gdb: clang 6 crashes during gdb 8.1 build (-fstrict-aliasing)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226658

            Bug ID: 226658
           Summary: devel/gdb: clang 6 crashes during gdb 8.1 build
                    (-fstrict-aliasing)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: toolchain
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: pizzamig at freebsd.org
          Reporter: jbeich at FreeBSD.org
            Blocks: 224669
             Flags: maintainer-feedback?(pizzamig at freebsd.org)
          Assignee: pizzamig at freebsd.org

$ env WITHOUT_NO_STRICT_ALIASING=1 make clean all BATCH=
[...]
c++ -x c++  -O2 -pipe -DRL_NO_COMPAT -Wno-unused-function -Wno-unused-variable
-Wno-unknown-warning-option -DLIBICONV_PLUG -Wno-extended-offsetof
-fstack-protector  -DLIBICONV_PLUG   -I. -I. -I./common -I./config
-DLOCALEDIR="\"/usr/local/share/locale\"" -DHAVE_CONFIG_H -I./../include/opcode
-I./../opcodes/..  -I./../zlib -I../bfd -I./../bfd -I./../include
-I../libdecnumber -I./../libdecnumber  -I./gnulib/import -Ibuild-gnulib/import 
 -DTUI=1  -DLIBICONV_PLUG -I/usr/local/include  -I/usr/local/include/python2.7
-I/usr/local/include/python2.7 -Wall -Wpointer-arith -Wno-unused -Wno-switch
-Wno-char-subscripts -Wempty-body -Wno-sign-compare -Wno-narrowing
-Wno-mismatched-tags -Wformat-nonliteral  -c -o minsyms.o -MT minsyms.o -MMD
-MP -MF ./.deps/minsyms.Tpo minsyms.c
Did not see access type in access path!
  %41 = load i8*, i8** %object_base, align 8, !tbaa !109
!109 = !{!77, !8, i64 16}
Did not see access type in access path!
  %83 = load i8*, i8** %next_free57, align 8, !tbaa !113
!113 = !{!77, !8, i64 24}
Did not see access type in access path!
  store i8* %add.ptr58, i8** %next_free57, align 8, !tbaa !113
!113 = !{!77, !8, i64 24}
fatal error: error in backend: Broken function found, compilation aborted!
c++: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM
6.0.0)
Target: x86_64-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224669
[Bug 224669] [exp-run] Against projects/clang600-import branch
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