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| author | David Robillard <d@drobilla.net> | 2022-06-28 16:14:45 -0400 |
|---|---|---|
| committer | David Robillard <d@drobilla.net> | 2022-06-28 18:52:19 -0400 |
| commit | acb8ea62ac287efcfb50f20cd419b70f6c5a15a9 (patch) | |
| tree | 657337f0bf6566b40e3a07002697347b5e35a0d9 /src/zix_config.h | |
| parent | 58d7fe43076a9825cf1f99d94ce224445ab9e405 (diff) | |
| download | zix-acb8ea62ac287efcfb50f20cd419b70f6c5a15a9.tar.gz zix-acb8ea62ac287efcfb50f20cd419b70f6c5a15a9.tar.bz2 zix-acb8ea62ac287efcfb50f20cd419b70f6c5a15a9.zip | |
Clean up build configuration
Diffstat (limited to 'src/zix_config.h')
| -rw-r--r-- | src/zix_config.h | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/src/zix_config.h b/src/zix_config.h index 832b50f..7be46e4 100644 --- a/src/zix_config.h +++ b/src/zix_config.h @@ -1,15 +1,26 @@ -// Copyright 2021 David Robillard <d@drobilla.net> +// Copyright 2021-2022 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. + This allows compile-time configuration from the command line, while still + allowing the source to be built "as-is" without any configuration. The idea + is to support an advanced build system with configuration checks, while still + allowing the code to be simply "thrown at a compiler" with features + determined from the compiler or system headers. Everything can be + overridden, so it should never be necessary to edit this file to build + successfully. + + To ensure that all configure checks are performed, the build system can + define ZIX_NO_DEFAULT_CONFIG to disable defaults. In this case, it must + define all HAVE_FEATURE symbols below to 1 or 0 to enable or disable + features. Any missing definitions will generate a compiler warning. + + To ensure that this header is always included properly, all code that uses + configuration variables includes this header and checks their value with #if + (not #ifdef). Variables like USE_FEATURE are internal and should never be + defined on the command line. */ #ifndef ZIX_CONFIG_H @@ -28,10 +39,21 @@ # endif # endif +// POSIX.1-2001: mlock() +# ifndef HAVE_MLOCK +# if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L +# define HAVE_MLOCK 1 +# else +# define HAVE_MLOCK 0 +# endif +# endif + // POSIX.1-2001: posix_memalign() # ifndef HAVE_POSIX_MEMALIGN # if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L -# define HAVE_POSIX_MEMALIGN +# define HAVE_POSIX_MEMALIGN 1 +# else +# define HAVE_POSIX_MEMALIGN 0 # endif # endif @@ -45,7 +67,13 @@ if the build system defines them all. */ -#ifdef HAVE_POSIX_MEMALIGN +#if HAVE_MLOCK +# define USE_MLOCK 1 +#else +# define USE_MLOCK 0 +#endif + +#if HAVE_POSIX_MEMALIGN # define USE_POSIX_MEMALIGN 1 #else # define USE_POSIX_MEMALIGN 0 |