[PATCH v3 1/2] Makefile scripts/Makefile.lib: fix *_efi.so dependency to PLATFORM_LIBGCC

[Tom Rini]

On Fri, Jul 18, 2025 at 11:29:58AM +0300, Mikko Rapeli wrote:

> When PLATFORM_LIBGCC was added to linker command it was not
> added to the dependency of the .so and other rules. Thus a build can
> try to link *_efi.so files before lib.a from PLATFORM_LIBGCC is available.
> This was seen in yocto autobuilder builds with u-boot 2025.07
> update, see https://lists.openembedded.org/g/openembedded-core/message/220004
> 
> https://autobuilder.yoctoproject.org/valkyrie/api/v2/logs/2914600/raw_inline
> 
> |    rm -f lib/efi_loader/built-in.o; arm-poky-linux-gnueabi-ar cDPrsT lib/efi_loader/built-in.o lib/efi_loader/efi_bootmgr.o lib/efi_loader/efi_bootbin.o lib/efi_loader/efi_boottime.o lib/efi_loader/efi_helper.o lib/efi_loader/efi_console.o lib/efi_loader/efi_device_path.o lib/efi_loader/efi_device_path_to_text.o lib/efi_loader/efi_device_path_utilities.o lib/efi_loader/efi_dt_fixup.o lib/efi_loader/efi_fdt.o lib/efi_loader/efi_file.o lib/efi_loader/efi_hii.o lib/efi_loader/efi_hii_config.o lib/efi_loader/efi_image_loader.o lib/efi_loader/efi_load_options.o lib/efi_loader/efi_memory.o lib/efi_loader/efi_root_node.o lib/efi_loader/efi_runtime.o lib/efi_loader/efi_setup.o lib/efi_loader/efi_string.o lib/efi_loader/efi_unicode_collation.o lib/efi_loader/efi_var_common.o lib/efi_loader/efi_var_mem.o lib/efi_loader/efi_variable.o lib/efi_loader/efi_var_file.o lib/efi_loader/efi_watchdog.o lib/efi_loader/efi_disk.o lib/efi_loader/efi_net.o lib/efi_loader/efi_smbios.o lib/efi_loader/efi_load_initrd.o lib/efi_loader/efi_conformance.o
> |   arm-poky-linux-gnueabi-ld.bfd -nostdlib -zexecstack -znocombreloc -znorelro --no-warn-rwx-segments -L /srv/pokybuild/yocto-worker/oe-selftest-armhost/build/build-st-3119200/tmp/work/beaglebone_yocto-poky-linux-gnueabi/u-boot/2025.07/sources/u-boot-2025.07 -T arch/arm/lib/elf_arm_efi.lds -shared -Bsymbolic -s lib/efi_loader/helloworld.o lib/efi_loader/efi_crt0.o lib/efi_loader/efi_reloc.o lib/efi_loader/efi_freestanding.o arch/arm/lib/lib.a -o lib/efi_loader/helloworld_efi.so
> | arm-poky-linux-gnueabi-ld.bfd: cannot find arch/arm/lib/lib.a: No such file or directory
> | make[3]: *** [scripts/Makefile.lib:512: lib/efi_loader/helloworld_efi.so] Error 1
> 
> The issue is hard to reproduce but this change can artificially trigger it:
> 
>   --- a/scripts/Makefile.build
>   +++ b/scripts/Makefile.build
> @@ -353,7 +353,7 @@ $(modorder-target): $(subdir-ym) FORCE
>  #
>  ifdef lib-target
>  quiet_cmd_link_l_target = AR      $@
> -cmd_link_l_target = rm -f $@; $(AR) cDPrsT$(KBUILD_ARFLAGS) $@ $(lib-y)
> +cmd_link_l_target = rm -f $@ && echo "HACK, delaying build!" && sleep 60 && $(AR) cDPrsT$(KBUILD_ARFLAGS) $@ $(lib-y)
> 
>  $(lib-target): $(lib-y) FORCE
>         $(call if_changed,link_l_target)
> 
> Then run a rebuild with:
> 
> $  rm -f $( find build/ -name lib.a -or -name helloworld_efi.so ) && \
>    make
> ...
>   arm-poky-linux-gnueabi-ld.bfd -nostdlib -zexecstack -znocombreloc -znorelro --no-warn-rwx-segments -L /home/mcfrisk/src/base/repo/poky/build_bea
> glebone/tmp/work/beaglebone_yocto-poky-linux-gnueabi/u-boot/2025.07/sources/u-boot-2025.07 -T arch/arm/lib/elf_arm_efi.lds -shared -Bsymbolic -s lib/efi_loader/helloworld.o lib/efi_loader/efi_crt0.o lib/efi_loader/efi_reloc.o lib/efi_loader/efi_freestanding.o arch/arm/lib/lib.a -o lib/efi_loader/helloworld_efi.so
> arm-poky-linux-gnueabi-ld.bfd: cannot find arch/arm/lib/lib.a: No such file or directory
> make[3]: *** [scripts/Makefile.lib:512: lib/efi_loader/helloworld_efi.so] Error 1
> 
> Fix by introducing PLATFORM_LIBGCC_LIBA variable with only lib.a
> filename which is then used to add the dependency in rules which use
> PLATFORM_LIBGCC. This should not impact builds which don't set
> PLATFORM_LIBGCC_LIBA and PLATFORM_LIBGCC usage stays as is.
> 
> Fixes: 43d43241d1c9 ("scripts/Makefile.lib: add PLATFORM_LIBGCC to efi linking")
> 
> Cc: Adriano Cordova <adrianox at gmail.com>
> Cc: Fabio Estevam <festevam at gmail.com>
> Signed-off-by: Mikko Rapeli <mikko.rapeli at linaro.org>

So, this series needs a cover letter. And to reword the commit messages,
so that the diff to make things fail shows up below the "---". But the
fatal problem for right now is this needs to be put through CI next
time. This seems to cause some of the EFI apps to not be built now:
https://source.denx.de/u-boot/u-boot/-/jobs/1209924

I assume Azure would have failed too if I let it get that far. Thanks.

-- 
Tom
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