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    1: dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
    2: dnl This file is free software, distributed under the terms of the GNU
    3: dnl General Public License.  As a special exception to the GNU General
    4: dnl Public License, this file may be distributed as part of a program
    5: dnl that contains a configuration script generated by Autoconf, under
    6: dnl the same distribution terms as the rest of that program.
    7: 
    8: dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
    9: 
   10: AC_PREREQ(2.13)
   11: 
   12: dnl without AC_MSG_...:   with AC_MSG_... and caching:
   13: dnl   AC_TRY_CPP          CL_CPP_CHECK
   14: dnl   AC_TRY_COMPILE      CL_COMPILE_CHECK
   15: dnl   AC_TRY_LINK         CL_LINK_CHECK
   16: dnl   AC_TRY_RUN          CL_RUN_CHECK - would require cross-compiling support
   17: dnl Usage:
   18: dnl AC_TRY_CPP(INCLUDES,
   19: dnl            ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
   20: dnl CL_CPP_CHECK(ECHO-TEXT, CACHE-ID,
   21: dnl              INCLUDES,
   22: dnl              ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
   23: dnl AC_TRY_xxx(INCLUDES, FUNCTION-BODY,
   24: dnl            ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
   25: dnl CL_xxx_CHECK(ECHO-TEXT, CACHE-ID,
   26: dnl              INCLUDES, FUNCTION-BODY,
   27: dnl              ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
   28: 
   29: AC_DEFUN([CL_CPP_CHECK],
   30: [AC_MSG_CHECKING(for $1)
   31: AC_CACHE_VAL($2,[
   32: AC_TRY_CPP([$3], $2=yes, $2=no)
   33: ])
   34: AC_MSG_RESULT([$]$2)
   35: if test [$]$2 = yes; then
   36:   ifelse([$4], , :, [$4])
   37: ifelse([$5], , , [else
   38:   $5
   39: ])dnl
   40: fi
   41: ])
   42: 
   43: AC_DEFUN([CL_COMPILE_CHECK],
   44: [AC_MSG_CHECKING(for $1)
   45: AC_CACHE_VAL($2,[
   46: AC_TRY_COMPILE([$3],[$4], $2=yes, $2=no)
   47: ])
   48: AC_MSG_RESULT([$]$2)
   49: if test [$]$2 = yes; then
   50:   ifelse([$5], , :, [$5])
   51: ifelse([$6], , , [else
   52:   $6
   53: ])dnl
   54: fi
   55: ])
   56: 
   57: AC_DEFUN([CL_LINK_CHECK],
   58: [AC_MSG_CHECKING(for $1)
   59: AC_CACHE_VAL($2,[
   60: AC_TRY_LINK([$3],[$4], $2=yes, $2=no)
   61: ])
   62: AC_MSG_RESULT([$]$2)
   63: if test [$]$2 = yes; then
   64:   ifelse([$5], , :, [$5])
   65: ifelse([$6], , , [else
   66:   $6
   67: ])dnl
   68: fi
   69: ])
   70: 
   71: dnl CL_SILENT(ACTION)
   72: dnl performs ACTION, with AC_MSG_CHECKING and AC_MSG_RESULT being defined away.
   73: AC_DEFUN([CL_SILENT],
   74: [pushdef([AC_MSG_CHECKING],[:])dnl
   75: pushdef([AC_CHECKING],[:])dnl
   76: pushdef([AC_MSG_RESULT],[:])dnl
   77: $1[]dnl
   78: popdef([AC_MSG_RESULT])dnl
   79: popdef([AC_CHECKING])dnl
   80: popdef([AC_MSG_CHECKING])dnl
   81: ])
   82: 
   83: dnl Expands to the "extern ..." prefix used for system declarations.
   84: dnl AC_LANG_EXTERN()
   85: AC_DEFUN([AC_LANG_EXTERN],
   86: [extern
   87: #ifdef __cplusplus
   88: "C"
   89: #endif
   90: ])
   91: 
   92: AC_DEFUN([CL_CC_WORKS],
   93: [AC_CACHE_CHECK(whether CC works at all, cl_cv_prog_cc_works, [
   94: AC_LANG_SAVE()
   95: AC_LANG_C()
   96: AC_TRY_RUN([int main() { exit(0); }],
   97: cl_cv_prog_cc_works=yes, cl_cv_prog_cc_works=no,
   98: AC_TRY_LINK([], [], cl_cv_prog_cc_works=yes, cl_cv_prog_cc_works=no))
   99: AC_LANG_RESTORE()
  100: ])
  101: case "$cl_cv_prog_cc_works" in
  102:   *no) echo "Installation or configuration problem: C compiler cannot create executables."; exit 1;;
  103:   *yes) ;;
  104: esac
  105: ])