Hi Piotr and David, 
    Thank you for your response.

Have modified the build.sh as mentioned, and for all below cases build.sh is failing with Error:  ld: fatal: symbol referencing errors. No output written to bootstrap/jam0

Case 1>     #!/bin/sh   --->  #!/bin/bash
Case 2>     machine=$(gcc -dumpmachine 2>/dev/null)   ---> machine=`gcc -dumpmachine 2>/dev/null`
Case 3>     machine=$(gcc -dumpmachine 2>/dev/null)   --->  machine=` echo $(gcc -dumpmachine 2>/dev/null) `
   
FYI, default shell of SunOS is /bin/sh
        $ echo $SHELL
        /bin/sh

Details:
  $ ./bootstrap.sh
      -n Bootstrapping the build engine with toolset sun...

      Failed to bootstrap the build engine
      Consult 'bootstrap.log' for more details

  $ cat bootstrap.log
     ###
     ### Using 'sun' toolset.
     ###
     rm -rf bootstrap
     mkdir bootstrap
     cc -o bootstrap/jam0 command.c compile.c constants.c debug.c execcmd.c frames.c function.c glob.c hash.c hdrmacro.c headers.c jam.c jambase.c jamgram.c lists.c make.c make1.c object.c option.c output.c parse.c pathsys.c regexp.c rules.c scan.c search.c subst.c timestamp.c        variable.c modules.c strings.c filesys.c builtins.c class.c cwd.c native.c md5.c w32_getreg.c modules/set.c modules/path.c modules/regex.c modules/property-set.c modules/sequence.c modules/order.c execunix.c fileunix.c pathunix.c
      command.c:
      compile.c:
      constants.c:
      debug.c:
      execcmd.c:
      frames.c:
      function.c:
      glob.c:
      hash.c:
      hdrmacro.c:
      headers.c:
      jam.c:
      jambase.c:
      jamgram.c:
      lists.c:
      make.c:
      make1.c:
      object.c:
      option.c:
      output.c:
      parse.c:
      pathsys.c:
      regexp.c:
      rules.c:
      scan.c:  search.c:
      subst.c:
      timestamp.c:
      variable.c:
      modules.c:
      strings.c:
      filesys.c:
      builtins.c:
      class.c:
      cwd.c:
      native.c:
      md5.c:
      w32_getreg.c:
      modules/set.c:
      modules/path.c:
      modules/regex.c:
      modules/property-set.c:
      modules/sequence.c:
      modules/order.c:
      execunix.c:
      fileunix.c:
      pathunix.c:
      Undefined                       first referenced
      symbol                             in file
      clock_gettime                       timestamp.o
      ld: fatal: symbol referencing errors. No output written to bootstrap/jam0
      bash-3.2$

--------------

On Thu, Nov 28, 2019 at 7:48 PM Piotr Kowalski via Boost-users <boost-users@lists.boost.org> wrote:
I guess SunOS uses System V specification which is older than POSIX and only supports `` syntax. If you look at autotools they never generate $() to make sure it wil work everywhere even on older /bin/sh

czw., 28 lis 2019 o 14:33 David Demelier via Boost-users <boost-users@lists.boost.org> napisał(a):
Le 28/11/2019 à 12:22, Piotr Kowalski via Boost-users a écrit :
> build.sh is intended for /bin/sh but uses bash-specific syntax $(command)

$() is part of POSIX though so I suppose the SunOS default shell isn't
POSIX compliant or too old.

Regards,

--
David
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