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).