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https://sourceware.org/git/glibc.git
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93fe09cb5f
This commit adds a new DIAG_IGNORE_Os_NEEDS_COMMENT which is only enabled when compiling with -Os. This allows developers working on -Os enabled builds to mark false-positive warnings without impacting the warnings emitted at -O2. Then using the new DIAG_IGNORE_Os_NEEDS_COMMENT we fix 6 warnings generated with GCC 5 to get -Os builds working again.
130 lines
5.3 KiB
C
130 lines
5.3 KiB
C
/* This file contains a number of internal prototype declarations that
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don't fit anywhere else. */
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#ifndef _LIBC_INTERNAL
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# define _LIBC_INTERNAL 1
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#include <hp-timing.h>
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/* Initialize the `__libc_enable_secure' flag. */
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extern void __libc_init_secure (void);
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/* This function will be called from _init in init-first.c. */
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extern void __libc_global_ctors (void);
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/* Discover the tick frequency of the machine if something goes wrong,
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we return 0, an impossible hertz. */
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extern int __profile_frequency (void);
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libc_hidden_proto (__profile_frequency)
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/* Hooks for the instrumenting functions. */
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extern void __cyg_profile_func_enter (void *this_fn, void *call_site);
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extern void __cyg_profile_func_exit (void *this_fn, void *call_site);
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/* Get frequency of the system processor. */
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extern hp_timing_t __get_clockfreq (void);
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/* Free all allocated resources. */
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extern void __libc_freeres (void);
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libc_hidden_proto (__libc_freeres)
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/* Free resources stored in thread-local variables on thread exit. */
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extern void __libc_thread_freeres (void);
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/* Define and initialize `__progname' et. al. */
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extern void __init_misc (int, char **, char **);
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# if IS_IN (rtld)
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extern __typeof (__profile_frequency) __profile_frequency attribute_hidden;
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# endif
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/* 1 if 'type' is a pointer type, 0 otherwise. */
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# define __pointer_type(type) (__builtin_classify_type ((type) 0) == 5)
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/* __intptr_t if P is true, or T if P is false. */
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# define __integer_if_pointer_type_sub(T, P) \
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__typeof__ (*(0 ? (__typeof__ (0 ? (T *) 0 : (void *) (P))) 0 \
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: (__typeof__ (0 ? (__intptr_t *) 0 : (void *) (!(P)))) 0))
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/* __intptr_t if EXPR has a pointer type, or the type of EXPR otherwise. */
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# define __integer_if_pointer_type(expr) \
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__integer_if_pointer_type_sub(__typeof__ ((__typeof__ (expr)) 0), \
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__pointer_type (__typeof__ (expr)))
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/* Cast an integer or a pointer VAL to integer with proper type. */
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# define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
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/* Align a value by rounding down to closest size.
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e.g. Using size of 4096, we get this behavior:
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{4095, 4096, 4097} = {0, 4096, 4096}. */
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#define ALIGN_DOWN(base, size) ((base) & -((__typeof__ (base)) (size)))
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/* Align a value by rounding up to closest size.
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e.g. Using size of 4096, we get this behavior:
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{4095, 4096, 4097} = {4096, 4096, 8192}.
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Note: The size argument has side effects (expanded multiple times). */
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#define ALIGN_UP(base, size) ALIGN_DOWN ((base) + (size) - 1, (size))
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/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer. */
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#define PTR_ALIGN_DOWN(base, size) \
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((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size)))
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/* Same as ALIGN_UP(), but automatically casts when base is a pointer. */
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#define PTR_ALIGN_UP(base, size) \
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((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
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/* Ignore the value of an expression when a cast to void does not
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suffice (in particular, for a call to a function declared with
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attribute warn_unused_result). */
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#define ignore_value(x) \
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({ __typeof__ (x) __ignored_value = (x); (void) __ignored_value; })
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/* The macros to control diagnostics are structured like this, rather
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than a single macro that both pushes and pops diagnostic state and
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takes the affected code as an argument, because the GCC pragmas
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work by disabling the diagnostic for a range of source locations
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and do not work when all the pragmas and the affected code are in a
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single macro expansion. */
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/* Push diagnostic state. */
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#define DIAG_PUSH_NEEDS_COMMENT _Pragma ("GCC diagnostic push")
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/* Pop diagnostic state. */
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#define DIAG_POP_NEEDS_COMMENT _Pragma ("GCC diagnostic pop")
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#define _DIAG_STR1(s) #s
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#define _DIAG_STR(s) _DIAG_STR1(s)
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/* Ignore the diagnostic OPTION. VERSION is the most recent GCC
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version for which the diagnostic has been confirmed to appear in
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the absence of the pragma (in the form MAJOR.MINOR for GCC 4.x,
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just MAJOR for GCC 5 and later). Uses of this pragma should be
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reviewed when the GCC version given is no longer supported for
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building glibc; the version number should always be on the same
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source line as the macro name, so such uses can be found with grep.
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Uses should come with a comment giving more details of the
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diagnostic, and an architecture on which it is seen if possibly
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optimization-related and not in architecture-specific code. This
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macro should only be used if the diagnostic seems hard to fix (for
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example, optimization-related false positives). */
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#define DIAG_IGNORE_NEEDS_COMMENT(version, option) \
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_Pragma (_DIAG_STR (GCC diagnostic ignored option))
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/* Similar to DIAG_IGNORE_NEEDS_COMMENT the following macro ignores the
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diagnostic OPTION but only if optimizations for size are enabled.
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This is required because different warnings may be generated for
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different optimization levels. For example a key piece of code may
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only generate a warning when compiled at -Os, but at -O2 you could
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still want the warning to be enabled to catch errors. In this case
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you would use DIAG_IGNORE_Os_NEEDS_COMMENT to disable the warning
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only for -Os. */
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#ifdef __OPTIMIZE_SIZE__
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# define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option) \
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_Pragma (_DIAG_STR (GCC diagnostic ignored option))
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#else
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# define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option)
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#endif
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#endif /* _LIBC_INTERNAL */
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