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Diffstat (limited to 'src/zix_config.h')
| -rw-r--r-- | src/zix_config.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/zix_config.h b/src/zix_config.h new file mode 100644 index 0000000..832b50f --- /dev/null +++ b/src/zix_config.h @@ -0,0 +1,54 @@ +// Copyright 2021 David Robillard <d@drobilla.net> +// SPDX-License-Identifier: ISC + +/* + Configuration header that defines reasonable defaults at compile time. + + This allows compile-time configuration from the command line (typically via + the build system) while still allowing the source to be built without any + configuration. The build system can define ZIX_NO_DEFAULT_CONFIG to disable + defaults, in which case it must define things like HAVE_FEATURE to enable + features. The design here ensures that compiler warnings or + include-what-you-use will catch any mistakes. +*/ + +#ifndef ZIX_CONFIG_H +#define ZIX_CONFIG_H + +#if !defined(ZIX_NO_DEFAULT_CONFIG) + +// We need unistd.h to check _POSIX_VERSION +# ifndef ZIX_NO_POSIX +# ifdef __has_include +# if __has_include(<unistd.h>) +# include <unistd.h> +# endif +# elif defined(__unix__) +# include <unistd.h> +# endif +# endif + +// POSIX.1-2001: posix_memalign() +# ifndef HAVE_POSIX_MEMALIGN +# if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L +# define HAVE_POSIX_MEMALIGN +# endif +# endif + +#endif // !defined(ZIX_NO_DEFAULT_CONFIG) + +/* + Make corresponding USE_FEATURE defines based on the HAVE_FEATURE defines from + above or the command line. The code checks for these using #if (not #ifdef), + so there will be an undefined warning if it checks for an unknown feature, + and this header is always required by any code that checks for features, even + if the build system defines them all. +*/ + +#ifdef HAVE_POSIX_MEMALIGN +# define USE_POSIX_MEMALIGN 1 +#else +# define USE_POSIX_MEMALIGN 0 +#endif + +#endif // ZIX_CONFIG_H |