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(autocf21.info.gz) Guidelines

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 5.4.2 Guidelines for Test Programs
 ----------------------------------
 
 Test programs should not write anything to the standard output.  They
 should return 0 if the test succeeds, nonzero otherwise, so that success
 can be distinguished easily from a core dump or other failure;
 segmentation violations and other failures produce a nonzero exit
 status.  Test programs should `exit', not `return', from `main',
 because on some systems (old Suns, at least) the argument to `return'
 in `main' is ignored.
 
    Test programs can use `#if' or `#ifdef' to check the values of
 preprocessor macros defined by tests that have already run.  For
 example, if you call `AC_HEADER_STDC', then later on in `configure.in'
 you can have a test program that includes an ANSI C header file
 conditionally:
 
      #if STDC_HEADERS
      # include <stdlib.h>
      #endif
 
    If a test program needs to use or create a data file, give it a name
 that starts with `conftest', such as `conftestdata'.  The `configure'
 script cleans up by running `rm -rf conftest*' after running test
 programs and if the script is interrupted.
 
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