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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, or simply to try some
library feature, use AC_COMPILE_IFELSE to try to compile a small
program that uses that feature.
AC_LANG_PROGRAM and friends.
This macro 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.
It is customary to report unexpected failures with
AC_MSG_FAILURE. This macro does not try to link; use
AC_LINK_IFELSE if you need to do that (see section 6.5 Running the Linker).