On Mon, Aug 2, 2021 at 2:05 PM Nathan Chancellor <nathan@xxxxxxxxxx> wrote:
>
> When building ARCH=riscv allmodconfig with llvm-objcopy, the objcopy
> version warning from this script appears:
>
> WARNING: could not find objcopy version or version is less than 2.17.
> Local function references are disabled.
>
> The check_objcopy() function in scripts/recordmcount.pl is set up to
> parse GNU objcopy's version string, not llvm-objcopy's, which triggers
> the warning.
>
> Commit 799c43415442 ("kbuild: thin archives make default for all archs")
> made binutils 2.20 mandatory and commit ba64beb17493 ("kbuild: check the
> minimum assembler version in Kconfig") enforces this at configuration
> time so just remove check_objcopy() and $can_use_local instead, assuming
> --globalize-symbol is always available.
>
> llvm-objcopy has supported --globalize-symbol since LLVM 7.0.0 in 2018
> and the minimum version for building the kernel with LLVM is 10.0.1 so
> there is no issue introduced:
>
> https://github.com/llvm/llvm-project/commit/ee5be798dae30d5f9414b01f76ff807edbc881aa
^ should this be a Link: tag?
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
>
> Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> ---
> Makefile | 1 -
> scripts/recordmcount.pl | 40 ----------------------------------------
> 2 files changed, 41 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 27a072cffcb9..b6ee64dd435e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -546,7 +546,6 @@ export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
> PHONY += scripts_basic
> scripts_basic:
> $(Q)$(MAKE) $(build)=scripts/basic
> - $(Q)rm -f .tmp_quiet_recordmcount
>
> PHONY += outputmakefile
> ifdef building_out_of_srctree
> diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> index c17e48020ec3..8f6b13ae46bf 100755
> --- a/scripts/recordmcount.pl
> +++ b/scripts/recordmcount.pl
> @@ -173,39 +173,6 @@ my $mcount_regex; # Find the call site to mcount (return offset)
> my $mcount_adjust; # Address adjustment to mcount offset
> my $alignment; # The .align value to use for $mcount_section
> my $section_type; # Section header plus possible alignment command
> -my $can_use_local = 0; # If we can use local function references
> -
> -# Shut up recordmcount if user has older objcopy
> -my $quiet_recordmcount = ".tmp_quiet_recordmcount";
> -my $print_warning = 1;
> -$print_warning = 0 if ( -f $quiet_recordmcount);
> -
> -##
> -# check_objcopy - whether objcopy supports --globalize-symbols
> -#
> -# --globalize-symbols came out in 2.17, we must test the version
> -# of objcopy, and if it is less than 2.17, then we can not
> -# record local functions.
> -sub check_objcopy
> -{
> - open (IN, "$objcopy --version |") or die "error running $objcopy";
> - while (<IN>) {
> - if (/objcopy.*\s(\d+)\.(\d+)/) {
> - $can_use_local = 1 if ($1 > 2 || ($1 == 2 && $2 >= 17));
> - last;
> - }
> - }
> - close (IN);
> -
> - if (!$can_use_local && $print_warning) {
> - print STDERR "WARNING: could not find objcopy version or version " .
> - "is less than 2.17.\n" .
> - "\tLocal function references are disabled.\n";
> - open (QUIET, ">$quiet_recordmcount");
> - printf QUIET "Disables the warning from recordmcount.pl\n";
> - close QUIET;
> - }
> -}
>
> if ($arch =~ /(x86(_64)?)|(i386)/) {
> if ($bits == 64) {
> @@ -434,8 +401,6 @@ if ($filename =~ m,^(.*)(\.\S),) {
> my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s";
> my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o";
>
> -check_objcopy();
> -
> #
> # Step 1: find all the local (static functions) and weak symbols.
> # 't' is local, 'w/W' is weak
> @@ -473,11 +438,6 @@ sub update_funcs
>
> # is this function static? If so, note this fact.
> if (defined $locals{$ref_func}) {
> -
> - # only use locals if objcopy supports globalize-symbols
> - if (!$can_use_local) {
> - return;
> - }
> $convert{$ref_func} = 1;
> }
>
>
> base-commit: c500bee1c5b2f1d59b1081ac879d73268ab0ff17
> --
> 2.32.0.264.g75ae10bc75
>
--
Thanks,
~Nick Desaulniers
