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binutils-gdb/ld/config.in
Frank Ch. Eigler 2299dfd4ba ld: support --build-id=xx mode 
The is patch adds a new ld build-id computation mode, "xx", using
xxhash in its 128-bit mode.  The patch prereqs the xxhash-devel
headers being installed, and uses the "all-inlined" model, so no
run-time or link-time library dependence exists.

The xxhash mode performs well, saving roughly 20% of total userspace
run time from an ld job over a 800MB shared library relative to sha1.
128 bits of good hash should be collision-resistant to a number of
distinct binaries that numbers in the 2**32 - 2**64 range, even if not
"crypto" level hash.  Confirmations of this are in progress.

         ld/configury: add --with-xxhash mode, different from gdb case
                       because only using it in inline mode

         ld/ldbuildid.c: add "xx" mode, #if WITH_XXHASH

         ld/NEWS, ld.texi: mention new option

         ld/lexsup.c: add enumeration of --build-id STYLES to --help

         ld/testsuite/ld-elf/build-id.exp: add test case for 0xHEX case
                                           and conditional for xx case;
                                           also, simply tcl list syntax

https://inbox.sourceware.org/binutils/20240917201509.GB26396@redhat.com/

Signed-off-by: Frank Ch. Eigler <fche@redhat.com>
2024-09-24 09:59:42 -04:00

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/* config.in. Generated from configure.ac by autoheader. */
/* Check that config.h is #included before system headers
(this works only for glibc, but that should be enough). */
#if defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__CONFIG_H__)
# error config.h must be #included before system headers
#endif
#define __CONFIG_H__ 1
/* Default compression algorithm for --enable-compressed-debug-sections. */
#undef DEFAULT_COMPRESSED_DEBUG_ALGORITHM
/* Define to 1 if you want to emit gnu hash in the ELF linker by default. */
#undef DEFAULT_EMIT_GNU_HASH
/* Define to 1 if you want to emit sysv hash in the ELF linker by default. */
#undef DEFAULT_EMIT_SYSV_HASH
/* Define if you want compressed debug sections by default. */
#undef DEFAULT_FLAG_COMPRESS_DEBUG
/* Define to 1 if you want to turn executable stack warnings into errors by
default. */
#undef DEFAULT_LD_ERROR_EXECSTACK
/* Define to 1 if you want to turn executable segment warnings into errors by
default. */
#undef DEFAULT_LD_ERROR_RWX_SEGMENTS
/* Define to 0 if you want to disable the generation of an executable stack
when a .note-GNU-stack section is missing. */
#undef DEFAULT_LD_EXECSTACK
/* Define to 1 if you want to enable --rosegment in the ELF linker by default.
*/
#undef DEFAULT_LD_ROSEGMENT
/* The default method for DT_TEXTREL check in ELF linker. */
#undef DEFAULT_LD_TEXTREL_CHECK
/* Define to 1 if DT_TEXTREL check is warning in ELF linker by default. */
#undef DEFAULT_LD_TEXTREL_CHECK_WARNING
/* Define to 1 if you want to enable --warn-execstack in ELF linker by
default. */
#undef DEFAULT_LD_WARN_EXECSTACK
/* Define to 0 if you want to disable --warn-rwx-segments in ELF linker by
default. */
#undef DEFAULT_LD_WARN_RWX_SEGMENTS
/* Define to 1 if you want to enable -z mark-plt in ELF x86-64 linker by
default. */
#undef DEFAULT_LD_Z_MARK_PLT
/* Define to 1 if you want to enable -z relro in ELF linker by default. */
#undef DEFAULT_LD_Z_RELRO
/* Define to 1 if you want to enable -z separate-code in ELF linker by
default. */
#undef DEFAULT_LD_Z_SEPARATE_CODE
/* Define to 1 if you want to set DT_RUNPATH instead of DT_RPATH by default.
*/
#undef DEFAULT_NEW_DTAGS
/* Define if you want run-time sanity checks. */
#undef ENABLE_CHECKING
/* Handle .ctf type-info sections */
#undef ENABLE_LIBCTF
/* Define to 1 if translation of program messages to the user's native
language is requested. */
#undef ENABLE_NLS
/* Additional extension a shared object might have. */
#undef EXTRA_SHLIB_EXTENSION
/* Define to choose default GOT handling scheme */
#undef GOT_HANDLING_DEFAULT
/* Define to 1 if you have the Mac OS X function
CFLocaleCopyPreferredLanguages in the CoreFoundation framework. */
#undef HAVE_CFLOCALECOPYPREFERREDLANGUAGES
/* Define to 1 if you have the Mac OS X function CFPreferencesCopyAppValue in
the CoreFoundation framework. */
#undef HAVE_CFPREFERENCESCOPYAPPVALUE
/* Define to 1 if you have the `close' function. */
#undef HAVE_CLOSE
/* Define if the GNU dcgettext() function is already present or preinstalled.
*/
#undef HAVE_DCGETTEXT
/* Define to 1 if you have the declaration of `asprintf', and to 0 if you
don't. */
#undef HAVE_DECL_ASPRINTF
/* Define to 1 if you have the declaration of `environ', and to 0 if you
don't. */
#undef HAVE_DECL_ENVIRON
/* Is the prototype for getopt in <unistd.h> in the expected format? */
#undef HAVE_DECL_GETOPT
/* Define to 1 if you have the declaration of `stpcpy', and to 0 if you don't.
*/
#undef HAVE_DECL_STPCPY
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
/* Define to 1 if you have the <elf-hints.h> header file. */
#undef HAVE_ELF_HINTS_H
/* Define to 1 if you have the <fcntl.h> header file. */
#undef HAVE_FCNTL_H
/* Define to 1 if you have the `getpagesize' function. */
#undef HAVE_GETPAGESIZE
/* Define if the GNU gettext() function is already present or preinstalled. */
#undef HAVE_GETTEXT
/* Define to 1 if you have the `glob' function. */
#undef HAVE_GLOB
/* Define if you have the iconv() function and it works. */
#undef HAVE_ICONV
/* Define .init_array/.fini_array sections are available and working. */
#undef HAVE_INITFINI_ARRAY
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
/* The jansson library is to be used */
#undef HAVE_JANSSON
/* Define if your <locale.h> file defines LC_MESSAGES. */
#undef HAVE_LC_MESSAGES
/* Define to 1 if you have the <limits.h> header file. */
#undef HAVE_LIMITS_H
/* Define to 1 if you have the `lseek' function. */
#undef HAVE_LSEEK
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have the `mkstemp' function. */
#undef HAVE_MKSTEMP
/* Define to 1 if you have a working `mmap' system call. */
#undef HAVE_MMAP
/* Define to 1 if you have the `open' function. */
#undef HAVE_OPEN
/* Define to 1 if you have the `realpath' function. */
#undef HAVE_REALPATH
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the <strings.h> header file. */
#undef HAVE_STRINGS_H
/* Define to 1 if you have the <string.h> header file. */
#undef HAVE_STRING_H
/* Define to 1 if you have the <sys/file.h> header file. */
#undef HAVE_SYS_FILE_H
/* Define to 1 if you have the <sys/mman.h> header file. */
#undef HAVE_SYS_MMAN_H
/* Define to 1 if you have the <sys/param.h> header file. */
#undef HAVE_SYS_PARAM_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/time.h> header file. */
#undef HAVE_SYS_TIME_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to 1 if you have the `waitpid' function. */
#undef HAVE_WAITPID
/* Define to 1 if you have the <windows.h> header file. */
#undef HAVE_WINDOWS_H
/* Define to 1 if zstd is enabled. */
#undef HAVE_ZSTD
/* Define to the sub-directory in which libtool stores uninstalled libraries.
*/
#undef LT_OBJDIR
/* Name of package */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the home page for this package. */
#undef PACKAGE_URL
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* The size of `void *', as computed by sizeof. */
#undef SIZEOF_VOID_P
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Define to 1 if you want to support the --error-handling-script command line
option. */
#undef SUPPORT_ERROR_HANDLING_SCRIPT
/* Use b modifier when opening binary files? */
#undef USE_BINARY_FOPEN
/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable GNU extensions on systems that have them. */
#ifndef _GNU_SOURCE
# undef _GNU_SOURCE
#endif
/* Enable threading extensions on Solaris. */
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#endif
/* Enable extensions on HP NonStop. */
#ifndef _TANDEM_SOURCE
# undef _TANDEM_SOURCE
#endif
/* Enable general extensions on Solaris. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
/* Version number of package */
#undef VERSION
/* whether to use inline xxhash */
#undef WITH_XXHASH
/* Define to 1 if `lex' declares `yytext' as a `char *' by default, not a
`char[]'. */
#undef YYTEXT_POINTER
/* Enable large inode numbers on Mac OS X 10.5. */
#ifndef _DARWIN_USE_64_BIT_INODE
# define _DARWIN_USE_64_BIT_INODE 1
#endif
/* Number of bits in a file offset, on hosts where this is settable. */
#undef _FILE_OFFSET_BITS
/* Define for large files, on AIX-style hosts. */
#undef _LARGE_FILES
/* Define to 1 if on MINIX. */
#undef _MINIX
/* Define to 2 if the system does not provide POSIX.1 features except with
this defined. */
#undef _POSIX_1_SOURCE
/* Define to 1 if you need to in order for `stat' and other things to work. */
#undef _POSIX_SOURCE
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