(autoconf.info.gz) Examining Syntax

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 Examining Syntax
 ================
 
    To check for a syntax feature of the C, C++, or Fortran 77 compiler,
 such as whether it recognizes a certain keyword, use `AC_TRY_COMPILE' to
 try to compile a small program that uses that feature.  You can also use
 it to check for structures and structure members that are not present on
 all systems.
 
  - Macro: AC_TRY_COMPILE (INCLUDES, FUNCTION-BODY, [ACTION-IF-FOUND],
           [ACTION-IF-NOT-FOUND])
      Choice::) to see whether a function whose body consists of
      FUNCTION-BODY can be compiled.  If the file compiles successfully,
      run shell commands ACTION-IF-FOUND, otherwise run
      ACTION-IF-NOT-FOUND.
 
      This macro double quotes both INCLUDES and FUNCTION-BODY.
 
      For C and C++, INCLUDES is any `#include' statements needed by the
      code in FUNCTION-BODY (INCLUDES will be ignored if the currently
      selected language is Fortran 77).  This macro also uses `CFLAGS'
      or `CXXFLAGS' if either C or C++ is the currently selected
      language, as well as `CPPFLAGS', when compiling.  If Fortran 77 is
      the currently selected language then `FFLAGS' will be used when
      compiling.
 
      This macro does not try to link; use `AC_TRY_LINK' if you need to
      do that ( Examining Libraries).
 

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