Macro: ac_cxx_nceg_restrict

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Synopsis

  `AC_CXX_NCEG_RESTRICT`

Version

  1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.39

Author

  Luc Maisonobe

Description

  If the compiler supports the Numerical C Extensions Group restrict keyword, define HAVE_NCEG_RESTRICT.

M4 Source Code

      AC_DEFUN([AC_CXX_NCEG_RESTRICT],
      [AC_CACHE_CHECK(whether the compiler supports the Numerical C Extensions Group restrict keyword,
      ac_cv_cxx_nceg_restrict,
      [AC_LANG_SAVE
       AC_LANG_CPLUSPLUS
       AC_TRY_COMPILE([
      void add(int length, double * restrict a,
               const double * restrict b, const double * restrict c)
      { for (int i=0; i < length; ++i) a[i] = b[i] + c[i];}
      ],[double a[10], b[10], c[10];
      for (int i=0; i < 10; ++i) { a[i] = 0.0;  b[i] = 0.0; c[i] = 0.0;}
      add(10,a,b,c);
      return 0;],
       ac_cv_cxx_nceg_restrict=yes, ac_cv_cxx_nceg_restrict=no)
       AC_LANG_RESTORE
      ])
      if test "$ac_cv_cxx_nceg_restrict" = yes; then
        AC_DEFINE(HAVE_NCEG_RESTRICT,,
                  [define if  the compiler supports the Numerical C Extensions Group restrict keyword])
      fi
      ])