"ptxdist"*** These critical programs are missing or too old: compiler

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接上篇

安装环境：

ptxdist 2018.02  &&  oselas.toolchain 2018.2

如果再ubuntu 14.04的版本进行交叉工具链的编译，可能会有问题，问题出在软件版本的要求没有到达要求，参见INSTALL文件中的Recommended Tools for Compilation章节，

以glibc-headers文件夹下的INSTALL文件

Recommended Tools for Compilation
=================================

We recommend installing the following GNU tools before attempting to
build the GNU C Library:

   * GNU 'make' 3.79 or newer

     You need the latest version of GNU 'make'.  Modifying the GNU C
     Library to work with other 'make' programs would be so difficult
     that we recommend you port GNU 'make' instead.  *Really.*  We
     recommend GNU 'make' version 3.79.  All earlier versions have
     severe bugs or lack features.

   * GCC 4.9 or newer

     GCC 4.9 or higher is required.  In general it is recommended to use
     the newest version of the compiler that is known to work for
     building the GNU C Library, as newer compilers usually produce
     better code.  As of release time, GCC 7.3 is the newest compiler
     verified to work to build the GNU C Library.

     For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher
     is required.  This compiler version is the first to provide the
     features required for building the GNU C Library with support for
     '_Float128'.

     For multi-arch support it is recommended to use a GCC which has
     been built with support for GNU indirect functions.  This ensures
     that correct debugging information is generated for functions
     selected by IFUNC resolvers.  This support can either be enabled by
     configuring GCC with '--enable-gnu-indirect-function', or by
     enabling it by default by setting 'default_gnu_indirect_function'
     variable for a particular architecture in the GCC source file
     'gcc/config.gcc'.

     You can use whatever compiler you like to compile programs that use
     the GNU C Library.

     Check the FAQ for any special compiler issues on particular
     platforms.

   * GNU 'binutils' 2.25 or later

     You must use GNU 'binutils' (as and ld) to build the GNU C Library.
     No other assembler or linker has the necessary functionality at the
     moment.  As of release time, GNU 'binutils' 2.29.1 is the newest
     verified to work to build the GNU C Library.

   * GNU 'texinfo' 4.7 or later

     To correctly translate and install the Texinfo documentation you
     need this version of the 'texinfo' package.  Earlier versions do
     not understand all the tags used in the document, and the
     installation mechanism for the info files is not present or works
     differently.  As of release time, 'texinfo' 6.5 is the newest
     verified to work to build the GNU C Library.

   * GNU 'awk' 3.1.2, or higher

     'awk' is used in several places to generate files.  Some 'gawk'
     extensions are used, including the 'asorti' function, which was
     introduced in version 3.1.2 of 'gawk'.  As of release time, 'gawk'
     version 4.2.0 is the newest verified to work to build the GNU C
     Library.

   * GNU 'bison' 2.7 or later

     'bison' is used to generate the 'yacc' parser code in the 'intl'
     subdirectory.  As of release time, 'bison' version 3.0.4 is the
     newest verified to work to build the GNU C Library.

   * Perl 5

     Perl is not required, but it is used if present to test the
     installation.  We may decide to use it elsewhere in the future.

   * GNU 'sed' 3.02 or newer

     'Sed' is used in several places to generate files.  Most scripts
     work with any version of 'sed'.  As of release time, 'sed' version
     4.4 is the newest verified to work to build the GNU C Library.

If you change any of the 'configure.ac' files you will also need

   * GNU 'autoconf' 2.69 (exactly)

and if you change any of the message translation files you will need

   * GNU 'gettext' 0.10.36 or later

尤其涉及gcc  python的系统要求，需要进行安装新版本，以及利用update-alternatives进行版本切换

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