autoconf/ast_c_define_check.m4

   1 # Check if a given macro is defined in a certain header.
   2
   3 # AST_C_DEFINE_CHECK([package], [macro name], [header file], [version])
   4 AC_DEFUN([AST_C_DEFINE_CHECK],
   5 [
   6     if test "x${PBX_$1}" != "x1"; then
   7         AC_MSG_CHECKING([for $2 in $3])
   8         saved_cppflags="${CPPFLAGS}"
   9         if test "x${$1_DIR}" != "x"; then
  10             $1_INCLUDE="-I${$1_DIR}/include"
  11         fi
  12         CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
  13
  14         AC_COMPILE_IFELSE(
  15             [ AC_LANG_PROGRAM( [#include <$3>],
  16                                [#if defined($2)
  17                                 int foo = 0;
  18                                 #else
  19                                 int foo = bar;
  20                                 #endif
  21                                 0
  22                                ])],
  23             [   AC_MSG_RESULT(yes)
  24                 PBX_$1=1
  25                 AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
  26                 m4_ifval([$4], [AC_DEFINE([HAVE_$1_VERSION], $4, [Define $1 headers version])])
  27             ],
  28             [   AC_MSG_RESULT(no) ]
  29         )
  30         CPPFLAGS="${saved_cppflags}"
  31     fi
  32     AC_SUBST(PBX_$1)
  33 ])