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(autoconf.info)Examining Syntax

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Examining Syntax
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   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]])
     Create a C, C++ or Fortran 77 test program (depending on which
     language is current, Note: Language Choice), to see whether a
     function whose body consists of FUNCTION-BODY can be compiled.

     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.

     If the file compiles successfully, run shell commands
     ACTION-IF-FOUND, otherwise run ACTION-IF-NOT-FOUND.

     This macro does not try to link; use `AC_TRY_LINK' if you need to
     do that (Note: Examining Libraries).