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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.
This macro uses
CXXFLAGS if either C or C++ is
the currently selected language, as well as
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).
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