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.
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 (see section Examining Libraries).
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