From noloader at gmail.com  Fri Nov  9 23:52:02 2018
From: noloader at gmail.com (Jeffrey Walton)
Date: Fri, 9 Nov 2018 17:52:02 -0500
Subject: How to remove hwcaps_2 from a program
Message-ID: <CAH8yC8kb==YD_FnTqfqDmzU9sRrCsY+w5d8UeXmkCR7XaQg40Q@mail.gmail.com>

Hi Everyone,

Sorry for asking here. The Solaris x86 newsgroup looks inactive. My
apologies in advance.

I'm having trouble removing hwcaps_2 from an executable and shared
object. It results in the following:

   $ ./cryptest.exe v
   ld.so.1: cryptest.exe: fatal: cryptest.exe:
   hardware capability (CA_SUNW_HW_2) unsupported: 0x40  [ AVX2 ]

This particular machine lacks AVX2, but we guard the code path at runtime.

My mapfile looks like so:

   $ cat cryptopp.mapfile
   hwcap_1 = SSE SSE2 OVERRIDE;
   hwcap_2 = V0x0;

I can't add OVERRIDE to hwcaps_2:

   $ cat cryptopp.mapfile
   hwcap_1 = SSE SSE2 OVERRIDE;
   hwcap_2 = V0x0 OVERRIDE;

It results in:

   ld: fatal: cryptopp.mapfile: 6: unknown segment attribute: override
   make: *** [GNUmakefile:1089: cryptest.exe] Error 2

I am also aware of
https://www.oracle.com/technetwork/server-storage/solaris/hwcap-modification-139536.html
, but none of the techniques work for me.

How do I remove hwcaps_2 from the executable and shared library?

We are trying to support back to Solaris 9 so $mapfile_version 1 is preferred.

Thanks in advance.

++++++++++

Here is the output from link:

$ CXX=/opt/developerstudio12.5/bin/CC make -j 5
/opt/developerstudio12.5/bin/CC -o cryptest.exe -DNDEBUG -g -xO3 -template=no%ex
tdef adhoc.o test.o bench1.o bench2.o bench3.o datatest.o dlltest.o fipsalgt.o v
alidat0.o validat1.o validat2.o validat3.o validat4.o validat5.o validat6.o vali
dat7.o validat8.o validat9.o validat10.o regtest1.o regtest2.o regtest3.o regtes
t4.o ./libcryptopp.a -xarch=sse2 -xarch=ssse3 -xarch=sse4_1 -xarch=sse4_2 -xarch
=aes -xarch=avx -xarch=avx2 -M cryptopp.mapfile -lnsl -lsocket

And:

$ elfdump -H cryptest.exe

Capabilities Section:  .SUNW_cap
 Object Capabilities:
  index  tag           value
    [0]  CA_SUNW_HW_2  0x40    [ AVX2 ]
    [1]  CA_SUNW_HW_1  0x1800  [ SSE2 SSE ]