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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
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
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
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 (see section 6.3 Examining Libraries).