( Test Programs

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 5.4.1 Running Test Programs
 Use the following macro if you need to test run-time behavior of the
 system while configuring.
      PROGRAM is the text of a C program, on which shell variable and
      backquote substitutions are performed.  If it compiles and links
      successfully and returns an exit status of 0 when executed, run
      shell commands ACTION-IF-TRUE.  Otherwise run shell commands
      ACTION-IF-FALSE; the exit status of the program is available in
      the shell variable `$?'.  This macro uses `CFLAGS' or `CXXFLAGS',
      `CPPFLAGS', `LDFLAGS', and `LIBS' when compiling.
      If the C compiler being used does not produce executables that run
      on the system where `configure' is being run, then the test
      program is not run.  If the optional shell commands
      ACTION-IF-CROSS-COMPILING are given, they are run instead.
      Otherwise, `configure' prints an error message and exits.
    Try to provide a pessimistic default value to use when
 cross-compiling makes run-time tests impossible.  You do this by
 passing the optional last argument to `AC_TRY_RUN'.  `autoconf' prints
 a warning message when creating `configure' each time it encounters a
 call to `AC_TRY_RUN' with no ACTION-IF-CROSS-COMPILING argument given.
 You may ignore the warning, though users will not be able to configure
 your package for cross-compiling.  A few of the macros distributed with
 Autoconf produce this warning message.
    To configure for cross-compiling you can also choose a value for
 those parameters based on the canonical system name ( Manual
 Configuration).  Alternatively, set up a test results cache file with
 the correct values for the target system ( Caching Results).
    To provide a default for calls of `AC_TRY_RUN' that are embedded in
 other macros, including a few of the ones that come with Autoconf, you
 can call `AC_PROG_CC' before running them.  Then, if the shell variable
 `cross_compiling' is set to `yes', use an alternate method to get the
 results instead of calling the macros.
  -- Macro: AC_C_CROSS
      This macro is obsolete; it does nothing.
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