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binutils, gdb: support zstd compressed debug sections

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PR29397 PR29563: Add new configure option --with-zstd which defaults to
auto.  If pkgconfig/libzstd.pc is found, define HAVE_ZSTD and support
zstd compressed debug sections for most tools.

* bfd: for addr2line, objdump --dwarf, gdb, etc
* gas: support --compress-debug-sections=zstd
* ld: support ELFCOMPRESS_ZSTD input and --compress-debug-sections=zstd
* objcopy: support ELFCOMPRESS_ZSTD input for
  --decompress-debug-sections and --compress-debug-sections=zstd
* gdb: support ELFCOMPRESS_ZSTD input.  The bfd change references zstd
  symbols, so gdb has to link against -lzstd in this patch.

If zstd is not supported, ELFCOMPRESS_ZSTD input triggers an error.  We
can avoid HAVE_ZSTD if binutils-gdb imports zstd/ like zlib/, but this
is too heavyweight, so don't do it for now.

```
% ld/ld-new a.o
ld/ld-new: a.o: section .debug_abbrev is compressed with zstd, but BFD is not built with zstd support
...

% ld/ld-new a.o --compress-debug-sections=zstd
ld/ld-new: --compress-debug-sections=zstd: ld is not built with zstd support

% binutils/objcopy --compress-debug-sections=zstd a.o b.o
binutils/objcopy: --compress-debug-sections=zstd: binutils is not built with zstd support

% binutils/objcopy b.o --decompress-debug-sections
binutils/objcopy: zstd.o: section .debug_abbrev is compressed with zstd, but BFD is not built with zstd support
...
```
This commit is contained in:
Fangrui Song
2022-09-26 19:50:13 -07:00
committed by Fangrui Song
parent e122316b7c
commit 2cac01e3ff
56 changed files with 1490 additions and 254 deletions
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44
binutils/testsuite/binutils-all/compress.exp
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@ -576,6 +576,50 @@ if { [regexp_diff objdump.out $srcdir/$subdir/dw2-3gabi.W] } then {
pass "$testname"
}
if { [binutils_assemble_flags $srcdir/$subdir/dw2-1.S ${compressedfile}zstd.o --compress-debug-sections=zstd] } then {
set testname "objcopy compress debug sections with zstd"
set got [binutils_run $OBJCOPY "--compress-debug-sections=zstd ${testfile}.o ${copyfile}zstd.o"]
if ![string match "" $got] then {
fail "objcopy ($testname)"
return
}
send_log "cmp ${compressedfile}zstd.o ${copyfile}zstd.o\n"
verbose "cmp ${compressedfile}zstd.o ${copyfile}zstd.o"
set src1 ${compressedfile}zstd.o
set src2 ${copyfile}zstd.o
set status [remote_exec build cmp "${src1} ${src2}"]
set exec_output [lindex $status 1]
set exec_output [prune_warnings $exec_output]
if ![string match "" $exec_output] then {
send_log "$exec_output\n"
verbose "$exec_output" 1
fail "objcopy ($testname)"
} else {
pass "objcopy ($testname)"
}
set testname "objcopy decompress compressed debug sections with zstd"
set got [binutils_run $OBJCOPY "--decompress-debug-sections ${compressedfile}zstd.o ${copyfile}zstd.o"]
if ![string match "" $got] then {
fail "objcopy ($testname)"
return
}
send_log "cmp ${testfile}.o ${copyfile}zstd.o\n"
verbose "cmp ${testfile}.o ${copyfile}zstd.o"
set src1 ${testfile}.o
set src2 ${copyfile}zstd.o
set status [remote_exec build cmp "${src1} ${src2}"]
set exec_output [lindex $status 1]
set exec_output [prune_warnings $exec_output]
if ![string match "" $exec_output] then {
send_log "$exec_output\n"
verbose "$exec_output" 1
fail "objcopy ($testname)"
} else {
pass "objcopy ($testname)"
}
}
proc convert_test { testname as_flags objcop_flags } {
global srcdir
global subdir