First of all: C89 or better. If you don't have that, port gcc first.
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Use of C language extensions throughout the X server tree
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---------------------------------------------------------
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Optional extensions:
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The server will still build if your toolchain does not support these
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extensions, although the results may not be optimal.
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* _X_SENTINEL(x): member x of the passed structure must be NULL, e.g.:
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void parseOptions(Option *options _X_SENTINEL(0));
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parseOptions("foo", "bar", NULL); /* this is OK */
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parseOptions("foo", "bar", "baz"); /* this is not */
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This definition comes from Xfuncproto.h in the core
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protocol headers.
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* _X_ATTRIBUTE_PRINTF(x, y): This function has printf-like semantics;
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check the format string when built with
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-Wformat (gcc) or similar.
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* _X_EXPORT: this function should appear in symbol tables.
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* _X_HIDDEN: this function should not appear in the _dynamic_ symbol
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table.
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* _X_INTERNAL: like _X_HIDDEN, but attempt to ensure that this function
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is never called from another module.
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* _X_INLINE: inline this function if possible (generally obeyed unless
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disabling optimisations).
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* _X_DEPRECATED: warn on use of this function.
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Mandatory extensions:
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The server will not build if your toolchain does not support these extensions.
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* named initialisers: explicitly initialising structure members, e.g.:
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struct foo bar = { .baz = quux, .brian = "dog" };
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* variadic macros: macros with a variable number of arguments, e.g.:
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#define DebugF(x, ...) /**/
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* interleaved code and declarations: { foo = TRUE; int bar; do_stuff(); }
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Use of library facilities throughout the X server tree
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-------------------------------------------------------------
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Non-OS-dependent code can assume facilities at least as good as
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the non-OS-facility parts of POSIX-1.2001. Ideally this would
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be C99, but even gcc+glibc doesn't implement that yet.
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Unix-like systems are assumed to be at least as good as UNIX03.
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Note that there are two Windows ports, Cygwin and MinGW:
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- Cygwin is more or less like Linux.
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- MinGW is more restrictive. Windows does not provide the required
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POSIX facilities, so some non-OS-dependent code is stubbed out or
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has an alternate implementation if WIN32 is defined. Code that
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needs to be portable to Windows should be careful to, well, be portable.
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Required OS facilities
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-------------------------------------------------------------
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Linux systems must be at least 2.4 or later. As a practical matter
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though, 2.4 kernels never receive any testing. Use 2.6 already.
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TODO: Solaris.
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TODO: *BSD.
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Windows-dependent code assumes at least NT 5.1.
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OSX support is generally limited to the most recent version. Currently
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that means 10.5.
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