prelude: Split bfs-specific utilities into new bfs.h header

1 files changed, 3 insertions, 194 deletions

diff --git a/src/prelude.h b/src/prelude.h
index 7df178c..5f7203e 100644
--- a/src/prelude.h
+++ b/src/prelude.h
@@ -8,20 +8,11 @@
 #ifndef BFS_PRELUDE_H
 #define BFS_PRELUDE_H
 
-// Possible __STDC_VERSION__ values
-
-#define C95 199409L
-#define C99 199901L
-#define C11 201112L
-#define C17 201710L
-#define C23 202311L
-
-// Get the static_assert() definition as well as __GLIBC__
-#include <assert.h>
-
 // Get the convenience macros that became standard spellings in C23
-#if __STDC_VERSION__ < C23
+#if __STDC_VERSION__ < 202311L
 
+/** _Static_assert() => static_assert() */
+#include <assert.h>
 /** _Alignas(), _Alignof() => alignas(), alignof() */
 #include <stdalign.h>
 /** _Bool => bool, true, false */
@@ -38,28 +29,6 @@
 
 #endif // !C23
 
-// bfs packaging configuration
-
-#include "config.h"
-
-#ifndef BFS_COMMAND
-#  define BFS_COMMAND "bfs"
-#endif
-#ifndef BFS_HOMEPAGE
-#  define BFS_HOMEPAGE "https://tavianator.com/projects/bfs.html"
-#endif
-
-// This is a symbol instead of a literal so we don't have to rebuild everything
-// when the version number changes
-extern const char bfs_version[];
-
-extern const char bfs_confflags[];
-extern const char bfs_cc[];
-extern const char bfs_cppflags[];
-extern const char bfs_cflags[];
-extern const char bfs_ldflags[];
-extern const char bfs_ldlibs[];
-
 // Feature detection
 
 // https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
@@ -99,164 +68,4 @@ extern const char bfs_ldlibs[];
 #  define __SANITIZE_THREAD__ true
 #endif
 
-// Fundamental utilities
-
-/**
- * Get the length of an array.
- */
-#define countof(...) (sizeof(__VA_ARGS__) / sizeof(0[__VA_ARGS__]))
-
-/**
- * False sharing/destructive interference/largest cache line size.
- */
-#ifdef __GCC_DESTRUCTIVE_SIZE
-#  define FALSE_SHARING_SIZE __GCC_DESTRUCTIVE_SIZE
-#else
-#  define FALSE_SHARING_SIZE 64
-#endif
-
-/**
- * True sharing/constructive interference/smallest cache line size.
- */
-#ifdef __GCC_CONSTRUCTIVE_SIZE
-#  define TRUE_SHARING_SIZE __GCC_CONSTRUCTIVE_SIZE
-#else
-#  define TRUE_SHARING_SIZE 64
-#endif
-
-/**
- * Alignment specifier that avoids false sharing.
- */
-#define cache_align alignas(FALSE_SHARING_SIZE)
-
-// Wrappers for attributes
-
-/**
- * Silence warnings about switch/case fall-throughs.
- */
-#if __has_attribute(fallthrough)
-#  define _fallthrough __attribute__((fallthrough))
-#else
-#  define _fallthrough ((void)0)
-#endif
-
-/**
- * Silence warnings about unused declarations.
- */
-#if __has_attribute(unused)
-#  define _maybe_unused __attribute__((unused))
-#else
-#  define _maybe_unused
-#endif
-
-/**
- * Warn if a value is unused.
- */
-#if __has_attribute(warn_unused_result)
-#  define _nodiscard __attribute__((warn_unused_result))
-#else
-#  define _nodiscard
-#endif
-
-/**
- * Hint to avoid inlining a function.
- */
-#if __has_attribute(noinline)
-#  define _noinline __attribute__((noinline))
-#else
-#  define _noinline
-#endif
-
-/**
- * Marks a non-returning function.
- */
-#if __STDC_VERSION__ >= C23
-#  define _noreturn [[noreturn]]
-#else
-#  define _noreturn _Noreturn
-#endif
-
-/**
- * Hint that a function is unlikely to be called.
- */
-#if __has_attribute(cold)
-#  define _cold _noinline __attribute__((cold))
-#else
-#  define _cold _noinline
-#endif
-
-/**
- * Adds compiler warnings for bad printf()-style function calls, if supported.
- */
-#if __has_attribute(format)
-#  define _printf(fmt, args) __attribute__((format(printf, fmt, args)))
-#else
-#  define _printf(fmt, args)
-#endif
-
-/**
- * Annotates functions that potentially modify and return format strings.
- */
-#if __has_attribute(format_arg)
-#  define _format_arg(arg) __attribute__((format_arg(arg)))
-#else
-#  define _format_arg(arg)
-#endif
-
-/**
- * Annotates allocator-like functions.
- */
-#if __has_attribute(malloc)
-#  if __GNUC__ >= 11 && !__OPTIMIZE__ // malloc(deallocator) disables inlining on GCC
-#    define _malloc(...) _nodiscard __attribute__((malloc(__VA_ARGS__)))
-#  else
-#    define _malloc(...) _nodiscard __attribute__((malloc))
-#  endif
-#else
-#  define _malloc(...) _nodiscard
-#endif
-
-/**
- * Specifies that a function returns allocations with a given alignment.
- */
-#if __has_attribute(alloc_align)
-#  define _alloc_align(param) __attribute__((alloc_align(param)))
-#else
-#  define _alloc_align(param)
-#endif
-
-/**
- * Specifies that a function returns allocations with a given size.
- */
-#if __has_attribute(alloc_size)
-#  define _alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
-#else
-#  define _alloc_size(...)
-#endif
-
-/**
- * Shorthand for _alloc_align() and _alloc_size().
- */
-#define _aligned_alloc(align, ...) _alloc_align(align) _alloc_size(__VA_ARGS__)
-
-/**
- * Check if function multiversioning via GNU indirect functions (ifunc) is supported.
- *
- * Disabled on TSan due to https://github.com/google/sanitizers/issues/342.
- */
-#ifndef BFS_USE_TARGET_CLONES
-#  if __has_attribute(target_clones) && (__GLIBC__ || __FreeBSD__) && !__SANITIZE_THREAD__
-#    define BFS_USE_TARGET_CLONES true
-#  endif
-#endif
-
-/**
- * Apply the target_clones attribute, if available.
- */
-#if BFS_USE_TARGET_CLONES
-#  define _target_clones(...) __attribute__((target_clones(__VA_ARGS__)))
-#else
-#  define _target_clones(...)
-#endif
-
 #endif // BFS_PRELUDE_H