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 test program in the current language (Note:Language
Choice) to see whether a function whose body consists of
FUNCTION-BODY can be compiled. If the file compiles successfully,
run shell commands ACTION-IF-FOUND, otherwise run
ACTION-IF-NOT-FOUND.
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 `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.
This macro does not try to link; use `AC_TRY_LINK' if you need to
do that (Note:Examining Libraries).