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common: Comment ELFMAG[1..3] in generated output.

elfdefinitions: Add a macro used for symbol versioning.

This change was missed out in [r4268].

common: Add DF_1_* symbols and aliases.

elfconstants: Remove unnecessary M4 quoting.

common: Add definitions used for symbol versioning.

elfconstants: Add VER_FLG_INFO.

elfdefinitions: Make a comment more accurate.

elfdefinitions: Add a definition for ELF_VER_CHR.

Minor: Add descriptions for ELFMAG and SELFMAG.

common: Refactor the ELF{32,64}_ST_*() macros.

Define ELF class-agnostic ELF_ST_*() macros for accessing the
'st_info' and 'st_other' fields of Elf##_Sym structures, and use
the class-agnostic definitions to implement the class-specific
ELF{32,64}_ST_*() macros.

The class-agnostic ELF_ST_*() macros should help improve the
succinctness of code fragments dealing with these fields that
are otherwise ELF class-agnostic.

common: Update the set of known SYMINFO_* constants.

common: Rework the M4 macros for ELF note types.

This change groups related definitions together, to ease adding
additional note types in the future.

elfconstants: add gABI v4.3(DRAFT) symbol DT_SYMTABSZ.

elfconstants: remove DT_MAXPOSTAGS.

This symbol holds the number of small-valued DT_* tags known
at compile time.

However, ELF files in the wild could contain DT_* tags that
are not known at compile time and/or could contain known
but non-small-valued tags in the range DT_LOOS (0x6000000D)
to DT_HIPROC (0x7FFFFFFF).  ELF-handling tools are expected
to handle such tags gracefully, which means that the value of
DT_MAXPOSTAGS is not useful in practice.

Remove the symbol to reduce maintenance overhead.

readelf: Ignore DT_MAXPOSTAGS.

This value is a sentinel, not an actual dynamic linking
tag.

common: Add C definitions for relative relocation entries.

common: Add ABI constants from v4.3(DRAFT) of the gABI.

libelf/testsuite: Check archive member timestamps returned by elf_getarhdr(3).

libelf: Document the ELF_E_ARCHIVE signalled by elf_getarhdr(3)
after [r4251].

libelf/testsuite: Only update Elf_Data fields that use non-default values.

This change avoids redundant assignment statements in generated test
code.

libelf: (bug fix) Parse the date field in ar(1) headers.

libelf: Signal ELF_E_ARCHIVE for ar(1) archives with an invalid header.

libelf: Reject ar(1) header fields with digits larger than their expected base.

libelf/testsuite: Add tests for ar(1) archive handling.

These tests verify that ar(1) archives with unparseable archive
headers are flagged appropriately.

ar/testsuite: Handle potential file access errors.

Detected by:    Coverity Scan

libelf/testsuite: pass the correct address range to munmap().

Detected by:    Coverity Scan

libelf/testsuite: Improve error handling during test case setup.

Detected by:    Coverity Scan

addr2line: Handle DWARF parsing failures.

Detected by:    Coverity Scan

ar: Fix a potential resource leak.

Detected by:    Coverity Scan

libelftc: Release resources on error.

Detected by:    Coverity Scan