[Bug 243227] net/norm: fix build on powerpc64 elfv2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243227

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: pkubaj
Date: Thu Jan 23 21:09:43 UTC 2020
New revision: 523941
URL: https://svnweb.freebsd.org/changeset/ports/523941

Log:
  net/norm: fix build on powerpc64 elfv2

  On ELFv2 ABI Clang can't build this port by default and throws assertion
(already reported):
  Assertion failed: ((Op.getOpcode() == ISD::FP_TO_SINT ||
Subtarget.hasFPCVT()) && "i64 FP_TO_UINT is supported only with FPCVT"),
function LowerFP_TO_INTForReuse, file
/poudriere/jails/powerpc64-elfv2-pkubaj/usr/src/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCISelLowering.cpp,
line 7281.
  Stack dump:
  0.    Program arguments: /usr/bin/c++ -cc1 -triple
powerpc64-unknown-freebsd13.0 -emit-obj -disable-free -main-file-name
protoDispatcher.cpp -mrelocation-model pic -pic-level 2 -mthread-model posix
-relaxed-aliasing -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu ppc64 -target-feature +secure-plt -mfloat-abi hard
-dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer
-coverage-notes-file
/wrkdirs/usr/ports/net/norm/work/norm-1.5r6/build/protolib/src/common/protoDispatcher.cpp.1.gcno
-resource-dir /usr/lib/clang/9.0.1 -I
/wrkdirs/usr/ports/net/norm/work/norm-1.5r6/build/protolib/include -I
/wrkdirs/usr/ports/net/norm/work/norm-1.5r6/protolib/include -I
/wrkdirs/usr/ports/net/norm/work/norm-1.5r6/build/protolib/include/unix -I
/wrkdirs/usr/ports/net/norm/work/norm-1.5r6/protolib/include/unix -D UNIX -D
HAVE_DIRFD -D HAVE_IPV6 -D HAVE_ASSERT -D HAVE_GETLOGIN -D HAVE_FLOCK -D NDEBUG
-internal-isystem /usr/include/c++/v1 -O3 -fdeprecated-macro -f
 debug-compilation-dir /wrkdirs/usr/ports/net/norm/work/norm-1.5r6/build
-ferror-limit 19 -fmessage-length 0 -stack-protector 2 -fno-signed-char
-fobjc-runtime=gnustep -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-vectorize-loops -vectorize-slp -faddrsig -o
/wrkdirs/usr/ports/net/norm/work/norm-1.5r6/build/protolib/src/common/protoDispatcher.cpp.1.o
-x c++ ../protolib/src/common/protoDispatcher.cpp
  1.    <eof> parser at end of file
  2.    Code generation
  3.    Running pass 'Function Pass Manager' on module
'../protolib/src/common/protoDispatcher.cpp'.
  4.    Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on
function '@_ZN15ProtoDispatcher4WaitEv'
  #0 0x000000001371df18 (/usr/bin/c+++0x1371df18)
  #1 0x000000001371e594 (/usr/bin/c+++0x1371e594)
  #2 0x000000001371b858 (/usr/bin/c+++0x1371b858)
  #3 0x000000001371ed0c (/usr/bin/c+++0x1371ed0c)
  #4 0x000000081520176c (/lib/libthr.so.3+0x1b76c)
  c++: error: unable to execute command: Abort trap (core dumped)
  c++: error: clang frontend command failed due to signal (use -v to see
invocation)
  FreeBSD clang version 9.0.1 (git at github.com:llvm/llvm-project.git
c1a0a213378a458fbea1a5c77b315c7dce08fd05) (based on LLVM 9.0.1)
  Target: powerpc64-unknown-freebsd13.0
  Thread model: posix
  InstalledDir: /usr/bin
  c++: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
  c++: note: diagnostic msg:

  The workaround is to optimize for POWER7, which supports necessary features
in hardware. This will break run-time for older CPU's, but at least we can get
this port running on POWER7 and newer.

  PR:           243227
  Approved by:  hd at oc.dk (maintainer timeout)

Changes:
  head/net/norm/Makefile

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