On Tue, Sep 27, 2022 at 3:54 PM Martin Liška <mli...@suse.cz> wrote:
>
> PING^1

OK

Thanks,
Richard.

> On 9/22/22 14:51, Martin Liška wrote:
> > Hi.
> >
> > Tested with Fangrui's patch set sent to binutils ML and mold linker.
> >
> > $ gcc -g -gz=zstd a.c --save-temps --verbose 2>&1 | grep debug-sections
> >  /home/marxin/Programming/binutils/objdir/gas/as-new -v --gdwarf-5 
> > --compress-debug-sections=zstd --64 -o a.o a.s
> >  /home/marxin/bin/gcc/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/collect2 
> > -plugin 
> > /home/marxin/bin/gcc/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/liblto_plugin.so
> >  
> > -plugin-opt=/home/marxin/bin/gcc/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
> >  -plugin-opt=-fresolution=a.res -plugin-opt=-pass-through=-lgcc 
> > -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc 
> > -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s 
> > --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 
> > --compress-debug-sections=zstd /lib/../lib64/crt1.o /lib/../lib64/crti.o 
> > /home/marxin/bin/gcc/lib64/gcc/x86_64-pc-linux-gnu/13.0.0/crtbegin.o 
> > -L/home/marxin/bin/gcc/lib64/gcc/x86_64-pc-linux-gnu/13.0.0 
> > -L/home/marxin/bin/gcc/lib64/gcc/x86_64-pc-linux-gnu/13.0.0/../../../../lib64
> >  -L/lib/../lib64 -L/usr/lib/../lib64 
> > -L/home/marxin/bin/gcc/lib64/gcc/x86_64-pc-linux-gnu/13.0.0/../../.. a.o 
> > -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s 
> > --no-as-needed 
> > /home/marxin/bin/gcc/lib64/gcc/x86_64-pc-linux-gnu/13.0.0/crtend.o 
> > /lib/../lib64/crtn.o
> >
> > $ gdb a.out
> > ...
> > BFD: /home/marxin/Programming/testcases/a.out: unable to initialize 
> > decompress status for section .debug_abbrev
> > BFD: /home/marxin/Programming/testcases/a.out: unable to initialize 
> > decompress status for section .debug_abbrev
> > "/home/marxin/Programming/testcases/a.out": not in executable format: file 
> > format not recognized
> >
> > So it's really compressed with zstd. I'm going to write ChangeLog entry for 
> > zlib-gnu once this gets merged as well.
> >
> > Ready to be installed?
> > Thanks,
> > Martin
> >
> >       PR driver/106897
> >
> > gcc/ChangeLog:
> >
> >       * common.opt: Add -gz=zstd value.
> >       * configure.ac: Detect --compress-debug-sections=zstd
> >       for both linker and assembler.
> >       * configure: Regenerate.
> >       * gcc.cc (LINK_COMPRESS_DEBUG_SPEC): Handle -gz=zstd.
> >       (ASM_COMPRESS_DEBUG_SPEC): Likewise.
> > ---
> >  gcc/common.opt   |  5 ++++-
> >  gcc/configure    | 11 +++++++++--
> >  gcc/configure.ac | 11 +++++++++--
> >  gcc/gcc.cc       | 15 +++++++++++++++
> >  4 files changed, 37 insertions(+), 5 deletions(-)
> >
> > diff --git a/gcc/common.opt b/gcc/common.opt
> > index 06ef768ab78..68370db816b 100644
> > --- a/gcc/common.opt
> > +++ b/gcc/common.opt
> > @@ -3419,7 +3419,10 @@ EnumValue
> >  Enum(compressed_debug_sections) String(zlib) Value(1)
> >
> >  EnumValue
> > -Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
> > +Enum(compressed_debug_sections) String(zstd) Value(2)
> > +
> > +EnumValue
> > +Enum(compressed_debug_sections) String(zlib-gnu) Value(3)
> >
> >  gz
> >  Common Driver
> > diff --git a/gcc/configure b/gcc/configure
> > index 70a013e9a30..ce4e1859e1f 100755
> > --- a/gcc/configure
> > +++ b/gcc/configure
> > @@ -29727,13 +29727,16 @@ else
> >     if $gcc_cv_as --compress-debug-sections -o conftest.o conftest.s 2>&1 | 
> > grep -i warning > /dev/null
> >     then
> >       gcc_cv_as_compress_debug=0
> > -   # Since binutils 2.26, gas supports --compress-debug-sections=zlib,
> > -   # defaulting to the ELF gABI format.
> >     elif $gcc_cv_as --compress-debug-sections=zlib -o conftest.o conftest.s 
> > > /dev/null 2>&1
> >     then
> >       gcc_cv_as_compress_debug=1
> >       gcc_cv_as_compress_debug_option="--compress-debug-sections"
> >       gcc_cv_as_no_compress_debug_option="--nocompress-debug-sections"
> > +     # Since binutils 2.40, gas supports --compress-debug-sections=zstd.
> > +     if $gcc_cv_as --compress-debug-sections=zstd -o conftest.o conftest.s 
> > > /dev/null 2>&1
> > +     then
> > +       gcc_cv_as_compress_debug=2
> > +     fi
> >     else
> >       gcc_cv_as_compress_debug=0
> >     fi
> > @@ -30251,6 +30254,10 @@ $as_echo_n "checking linker for compressed debug 
> > sections... " >&6; }
> >  if $gcc_cv_ld --help 2>&1 | grep -- 
> > '--compress-debug-sections.*\<zlib-gabi\>' > /dev/null; then
> >      gcc_cv_ld_compress_debug=1
> >      gcc_cv_ld_compress_debug_option="--compress-debug-sections"
> > +    # Detect zstd debug section compression support
> > +    if $gcc_cv_ld --help 2>&1 | grep -- 
> > '--compress-debug-sections.*\<zstd\>' > /dev/null; then
> > +      gcc_cv_ld_compress_debug=2
> > +    fi
> >  else
> >    case "${target}" in
> >      *-*-solaris2*)
> > diff --git a/gcc/configure.ac b/gcc/configure.ac
> > index 96e10d7c194..b6bafa8b7d6 100644
> > --- a/gcc/configure.ac
> > +++ b/gcc/configure.ac
> > @@ -5732,13 +5732,16 @@ gcc_GAS_CHECK_FEATURE([compressed debug sections],
> >     if $gcc_cv_as --compress-debug-sections -o conftest.o conftest.s 2>&1 | 
> > grep -i warning > /dev/null
> >     then
> >       gcc_cv_as_compress_debug=0
> > -   # Since binutils 2.26, gas supports --compress-debug-sections=zlib,
> > -   # defaulting to the ELF gABI format.
> >     elif $gcc_cv_as --compress-debug-sections=zlib -o conftest.o conftest.s 
> > > /dev/null 2>&1
> >     then
> >       gcc_cv_as_compress_debug=1
> >       gcc_cv_as_compress_debug_option="--compress-debug-sections"
> >       gcc_cv_as_no_compress_debug_option="--nocompress-debug-sections"
> > +     # Since binutils 2.40, gas supports --compress-debug-sections=zstd.
> > +     if $gcc_cv_as --compress-debug-sections=zstd -o conftest.o conftest.s 
> > > /dev/null 2>&1
> > +     then
> > +       gcc_cv_as_compress_debug=2
> > +     fi
> >     else
> >       gcc_cv_as_compress_debug=0
> >     fi])
> > @@ -6127,6 +6130,10 @@ AC_MSG_CHECKING(linker for compressed debug sections)
> >  if $gcc_cv_ld --help 2>&1 | grep -- 
> > '--compress-debug-sections.*\<zlib-gabi\>' > /dev/null; then
> >      gcc_cv_ld_compress_debug=1
> >      gcc_cv_ld_compress_debug_option="--compress-debug-sections"
> > +    # Detect zstd debug section compression support
> > +    if $gcc_cv_ld --help 2>&1 | grep -- 
> > '--compress-debug-sections.*\<zstd\>' > /dev/null; then
> > +      gcc_cv_ld_compress_debug=2
> > +    fi
> >  else
> >  changequote(,)dnl
> >    case "${target}" in
> > diff --git a/gcc/gcc.cc b/gcc/gcc.cc
> > index 7578988efa9..2ffbbc0bf2a 100644
> > --- a/gcc/gcc.cc
> > +++ b/gcc/gcc.cc
> > @@ -835,6 +835,14 @@ proper position among the other output files.  */
> >  #define LINK_COMPRESS_DEBUG_SPEC \
> >       " %{gz|gz=zlib:"  LD_COMPRESS_DEBUG_OPTION "=zlib}" \
> >       " %{gz=none:"     LD_COMPRESS_DEBUG_OPTION "=none}" \
> > +     " %{gz*:%e-gz=zstd is not supported in this configuration} " \
> > +     " %{gz=zlib-gnu:}" /* Ignore silently zlib-gnu option value.  */
> > +#elif HAVE_LD_COMPRESS_DEBUG == 2
> > +/* ELF gABI style and ZSTD.  */
> > +#define LINK_COMPRESS_DEBUG_SPEC \
> > +     " %{gz|gz=zlib:"  LD_COMPRESS_DEBUG_OPTION "=zlib}" \
> > +     " %{gz=none:"     LD_COMPRESS_DEBUG_OPTION "=none}" \
> > +     " %{gz=zstd:"     LD_COMPRESS_DEBUG_OPTION "=zstd}" \
> >       " %{gz=zlib-gnu:}" /* Ignore silently zlib-gnu option value.  */
> >  #else
> >  #error Unknown value for HAVE_LD_COMPRESS_DEBUG.
> > @@ -890,6 +898,13 @@ proper position among the other output files.  */
> >       " %{gz|gz=zlib:"  AS_COMPRESS_DEBUG_OPTION "=zlib}" \
> >       " %{gz=none:"     AS_COMPRESS_DEBUG_OPTION "=none}" \
> >       " %{gz=zlib-gnu:}" /* Ignore silently zlib-gnu option value.  */
> > +#elif HAVE_AS_COMPRESS_DEBUG == 2
> > +/* ELF gABI style and ZSTD.  */
> > +#define ASM_COMPRESS_DEBUG_SPEC \
> > +     " %{gz|gz=zlib:"  AS_COMPRESS_DEBUG_OPTION "=zlib}" \
> > +     " %{gz=none:"     AS_COMPRESS_DEBUG_OPTION "=none}" \
> > +     " %{gz=zstd:"     AS_COMPRESS_DEBUG_OPTION "=zstd}" \
> > +     " %{gz=zlib-gnu:}" /* Ignore silently zlib-gnu option value.  */
> >  #else
> >  #error Unknown value for HAVE_AS_COMPRESS_DEBUG.
> >  #endif
>

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