gcc/aclocal.m4

   1 dnl See whether we need a declaration for a function.
   2 AC_DEFUN(GCC_NEED_DECLARATION,
   3 [AC_MSG_CHECKING([whether $1 must be declared])
   4 AC_CACHE_VAL(gcc_cv_decl_needed_$1,
   5 [AC_TRY_COMPILE([
   6 #include <stdio.h>
   7 #ifdef HAVE_STRING_H
   8 #include <string.h>
   9 #else
  10 #ifdef HAVE_STRINGS_H
  11 #include <strings.h>
  12 #endif
  13 #endif
  14 #ifdef HAVE_STDLIB_H
  15 #include <stdlib.h>
  16 #endif
  17 #ifdef HAVE_UNISTD_H
  18 #include <unistd.h>
  19 #endif],
  20 [char *(*pfn) = (char *(*)) $1],
  21 gcc_cv_decl_needed_$1=no, gcc_cv_decl_needed_$1=yes)])
  22 AC_MSG_RESULT($gcc_cv_decl_needed_$1)
  23 if test $gcc_cv_decl_needed_$1 = yes; then
  24   gcc_tr_decl=NEED_DECLARATION_`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
  25   AC_DEFINE_UNQUOTED($gcc_tr_decl)
  26 fi
  27 ])dnl
  28
  29 dnl See if symbolic links work and if not, try to substitute either hard links or simple copy.
  30 AC_DEFUN(GCC_PROG_LN_S,
  31 [AC_MSG_CHECKING(whether ln -s works)
  32 AC_CACHE_VAL(gcc_cv_prog_LN_S,
  33 [rm -f conftestdata_to
  34 echo >conftestdata_from
  35 if ln -s conftestdata_from conftestdata_to 2>/dev/null
  36 then
  37   gcc_cv_prog_LN_S="ln -s"
  38 else
  39   if ln conftestdata_from conftestdata_to 2>/dev/null
  40   then
  41     gcc_cv_prog_LN_S=ln
  42   else
  43     gcc_cv_prog_LN_S=cp
  44   fi
  45 fi
  46 rm -f conftestdata_from conftestdata_to
  47 ])dnl
  48 LN_S="$gcc_cv_prog_LN_S"
  49 if test "$gcc_cv_prog_LN_S" = "ln -s"; then
  50   AC_MSG_RESULT(yes)
  51 else
  52   if test "$gcc_cv_prog_LN_S" = "ln"; then
  53     AC_MSG_RESULT([no, using ln])
  54   else
  55     AC_MSG_RESULT([no, and neither does ln, so using cp])
  56   fi
  57 fi
  58 AC_SUBST(LN_S)dnl
  59 ])
  60
  61 dnl See if hard links work and if not, try to substitute either symbolic links or simple copy.
  62 AC_DEFUN(GCC_PROG_LN,
  63 [AC_MSG_CHECKING(whether ln works)
  64 AC_CACHE_VAL(gcc_cv_prog_LN,
  65 [rm -f conftestdata_to
  66 echo >conftestdata_from
  67 if ln conftestdata_from conftestdata_to 2>/dev/null
  68 then
  69   gcc_cv_prog_LN="ln"
  70 else
  71   if ln -s conftestdata_from conftestdata_to 2>/dev/null
  72   then
  73     gcc_cv_prog_LN="ln -s"
  74   else
  75     gcc_cv_prog_LN=cp
  76   fi
  77 fi
  78 rm -f conftestdata_from conftestdata_to
  79 ])dnl
  80 LN="$gcc_cv_prog_LN"
  81 if test "$gcc_cv_prog_LN" = "ln"; then
  82   AC_MSG_RESULT(yes)
  83 else
  84   if test "$gcc_cv_prog_LN" = "ln -s"; then
  85     AC_MSG_RESULT([no, using ln -s])
  86   else
  87     AC_MSG_RESULT([no, and neither does ln -s, so using cp])
  88   fi
  89 fi
  90 AC_SUBST(LN)dnl
  91 ])