[Bug 225268] graphics/libsixel: clang 6 crashes during build

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225268

            Bug ID: 225268
           Summary: graphics/libsixel: clang 6 crashes during build
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: toolchain
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: sue at iwmt.org
            Blocks: 224669
                CC: sue at iwmt.org
             Flags: maintainer-feedback?(sue at iwmt.org)

Created attachment 189841
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=189841&action=edit
src/scale.c (compressed, preprocessed)

/bin/sh ../libtool  --tag=CC   --mode=compile cc -DHAVE_CONFIG_H -I. -I.. 
-I../include/  -O2 -pipe  -fstack-protector -fno-strict-aliasing -Wall -Wextra
-Wpedantic -Wformat=2 -Wsign-conversion -Wuninitialized -Wstrict-overflow
-Wshadow -Wdouble-promotion -Wswitch-default            -O2 -pipe 
-fstack-protector -fno-strict-aliasing -MT libsixel_la-scale.lo -MD -MP -MF
.deps/libsixel_la-scale.Tpo -c -o libsixel_la-scale.lo `test -f 'scale.c' ||
echo './'`scale.c
libtool: compile:  cc -DHAVE_CONFIG_H -I. -I.. -I../include/ -O2 -pipe
-fstack-protector -fno-strict-aliasing -Wall -Wextra -Wpedantic -Wformat=2
-Wsign-conversion -Wuninitialized -Wstrict-overflow -Wshadow -Wdouble-promotion
-Wswitch-default -O2 -pipe -fstack-protector -fno-strict-aliasing -MT
libsixel_la-scale.lo -MD -MP -MF .deps/libsixel_la-scale.Tpo -c scale.c  -fPIC
-DPIC -o .libs/libsixel_la-scale.o
Bad flavor while matching min/max
UNREACHABLE executed at
/usr/local/poudriere/jails/head-amd64/usr/src/contrib/llvm/lib/Analysis/ValueTracking.cpp:4217!
cc: error: unable to execute command: Abort trap (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 6.0.0 (branches/release_60 321788) (based on LLVM 6.0.0)
Target: x86_64-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin

http://beefy12.nyi.freebsd.org/data/head-amd64-default/p459147_s328035/logs/libsixel-1.7.2_1,1.log
http://beefy11.nyi.freebsd.org/data/head-i386-default/p459147_s328035/logs/libsixel-1.7.2_1,1.log
http://beefy8.nyi.freebsd.org/data/head-armv6-default/p459021_s327977/logs/libsixel-1.7.2_1,1.log


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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