Node:Examining Declarations, Next:Examining Syntax, Up:Writing Tests
The macro AC_TRY_CPP is used to check whether particular header
files exist. You can check for one at a time, or more than one if you
need several header files to all exist for some purpose.
| AC_TRY_CPP (input, [action-if-true], [action-if-false]) | Macro |
|
If the preprocessor produces no error messages while processing the
input (typically includes), run shell commands
action-if-true. Otherwise run shell commands
action-if-false. Beware that input is double quoted. Shell
variable, back quote, and backslash substitutions are performed on
input.
This macro uses |
Here is how to find out whether a header file contains a particular
declaration, such as a typedef, a structure, a structure member, or a
function. Use AC_EGREP_HEADER instead of running grep
directly on the header file; on some systems the symbol might be defined
in another header file that the file you are checking #includes.
| AC_EGREP_HEADER (pattern, header-file, action-if-found, [action-if-not-found]) | Macro |
If the output of running the preprocessor on the system header file
header-file matches the egrep regular expression
pattern, execute shell commands action-if-found, otherwise
execute action-if-not-found.
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To check for C preprocessor symbols, either defined by header files or
predefined by the C preprocessor, use AC_EGREP_CPP. Here is an
example of the latter:
AC_EGREP_CPP(yes, [#ifdef _AIX yes #endif ], is_aix=yes, is_aix=no)
| AC_EGREP_CPP (pattern, program, [action-if-found], [action-if-not-found]) | Macro |
program is the text of a C or C++ program, on which shell
variable, back quote, and backslash substitutions are performed. If the
output of running the preprocessor on program matches the
egrep regular expression pattern, execute shell commands
action-if-found, otherwise execute action-if-not-found.
This macro calls |