[Bug 243245] net/spread: fix build on powerpc64 elfv2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243245

            Bug ID: 243245
           Summary: net/spread: fix build on powerpc64 elfv2
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org
                CC: portmaster at bsdforge.com
             Flags: maintainer-feedback?(portmaster at bsdforge.com)
                CC: portmaster at bsdforge.com

Created attachment 210593
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=210593&action=edit
patch

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/cc -cc1 -triple
powerpc64-unknown-freebsd13.0 -emit-obj -disable-free -main-file-name Spread.c
-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/spread/work/spread-src-3.17.4/perl/Spread/Spread.gcno
-resource-dir /usr/lib/clang/9.0.1 -I ../.. -I ../spread-src-3.17.0/ -D
VERSION="3.17.4.4" -D XS_VERSION="3.17.4.4" -D PIC -I
/usr/local/lib/perl5/5.30/mach/CORE -O2 -fdebug-compilation-dir
/wrkdirs/usr/ports/net/spread/work/spread-src-3.17.4/perl/Spread -ferror-limit
19 -fmessage-length 0 -stack-protector 2 -fno-signed-char
-fobjc-runtime=gnustep -fdiagnostics-show-option -vectorize-loops
-vectorize-slp -faddrsig -o Spread.o -x c Spread.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'Spread.c'.
4.      Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on
function '@XS_Spread_receive'
#0 0x000000001371df18 (/usr/bin/cc+0x1371df18)
#1 0x000000001371e594 (/usr/bin/cc+0x1371e594)
#2 0x000000001371b858 (/usr/bin/cc+0x1371b858)
#3 0x000000001371ed0c (/usr/bin/cc+0x1371ed0c)
#4 0x000000081520176c (/lib/libthr.so.3+0x1b76c)
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 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
cc: 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.
cc: note: diagnostic msg: 
********************

The workaround is to optimize for POWER7, which supports necessary features in
hardware.

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