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Notes on ANSI C
===============
When building for pure ANSI C (C89/C90), you must configure with at least
the following configuration settings:
- `no-asm`
There are cases of `asm()` calls in our C source, which isn't supported
in pure ANSI C.
- `no-secure-memory`
The secure memory calls aren't supported with ANSI C.
- `-D_XOPEN_SOURCE=1`
This macro enables the use of the following types, functions and global
variables:
- `timezone`
- `-D_POSIX_C_SOURCE=200809L`
This macro enables the use of the following types, functions and global
variables:
- `ssize_t`
- `strdup()`
It's arguable that with gcc and clang, all of these issues are removed when
defining the macro `_DEFAULT_SOURCE`. However, that effectively sets the C
language level to C99, which isn't ANSI C.
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