aclocal.m4

   1 dnl --------------------------------------------------------------------------
   2 dnl PA_ADD_CFLAGS()
   3 dnl
   4 dnl Attempt to add the given option to CFLAGS, if it doesn't break compilation
   5 dnl --------------------------------------------------------------------------
   6 AC_DEFUN(PA_ADD_CFLAGS,
   7 [AC_MSG_CHECKING([if $CC accepts $1])
   8  pa_add_cflags__old_cflags="$CFLAGS"
   9  CFLAGS="$CFLAGS $1"
  10  AC_TRY_LINK([#include <stdio.h>],
  11  [printf("Hello, World!\n");],
  12  AC_MSG_RESULT([yes])
  13  CFLAGS="$pa_add_cflags__old_cflags ifelse([$2],[],[$1],[$2])",
  14  AC_MSG_RESULT([no])
  15  CFLAGS="$pa_add_cflags__old_cflags")])
  16
  17 dnl --------------------------------------------------------------------------
  18 dnl PA_HAVE_FUNC
  19 dnl
  20 dnl Look for a function with the specified arguments which could be
  21 dnl a builtin/intrinsic function.
  22 dnl --------------------------------------------------------------------------
  23 AC_DEFUN(PA_HAVE_FUNC,
  24 [AC_MSG_CHECKING([for $1])
  25 AC_TRY_LINK([], [(void)$1$2;],
  26 AC_MSG_RESULT([yes])
  27 AC_DEFINE(m4_toupper([HAVE_$1]), [1],
  28   [Define to 1 if you have the `$1' intrinsic function.]),
  29 AC_MSG_RESULT([no]))])
  30
  31 dnl --------------------------------------------------------------------------
  32 dnl PA_LIBEXT
  33 dnl
  34 dnl Guess the library extension based on the object extension
  35 dnl --------------------------------------------------------------------------
  36 AC_DEFUN(PA_LIBEXT,
  37 [AC_MSG_CHECKING([for suffix of library files])
  38 if test x"$LIBEXT" = x; then
  39   case "$OBJEXT" in
  40     obj )
  41       LIBEXT=lib
  42       ;;
  43     *)
  44       LIBEXT=a
  45       ;;
  46   esac
  47 fi
  48 AC_MSG_RESULT([$LIBEXT])
  49 AC_SUBST([LIBEXT])])
  50
  51 dnl --------------------------------------------------------------------------
  52 dnl PA_FUNC_ATTRIBUTE
  53 dnl
  54 dnl See if this compiler supports the equivalent of a specific gcc
  55 dnl attribute on a function, using the __attribute__(()) syntax.
  56 dnl All arguments except the attribute name are optional.
  57 dnl PA_FUNC_ATTRIBUTE(attribute, attribute_opts, return_type,
  58 dnl                   prototype_args, call_args)
  59 dnl --------------------------------------------------------------------------
  60 AC_DEFUN(PA_FUNC_ATTRIBUTE,
  61 [AC_MSG_CHECKING([if $CC supports the $1 function attribute])
  62  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
  63 #include <stdarg.h>
  64 extern ifelse([$3],[],[void *],[$3])  __attribute__(($1$2))
  65   bar(ifelse([$4],[],[int],[$4]));
  66 void *foo(void)
  67 {
  68         return bar(ifelse([$5],[],[1],[$5]));
  69 }
  70  ])],
  71  [AC_MSG_RESULT([yes])
  72   AC_DEFINE(m4_toupper([HAVE_FUNC_ATTRIBUTE_$1]), 1,
  73     [Define to 1 if your compiler supports __attribute__(($1)) on functions])],
  74  [AC_MSG_RESULT([no])])
  75 ])