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 -- 2.37.3