Yann reported in [1] that edk2 build could sometimes fail. The issue
can be reproduced when per-package directories is enabled, or also
when building on a system with GNU Make >= 4.4 using the
"--shuffle=reverse" option (such as Fedora 39). Those are pointing
toward a Makefile dependency issue.
The issue can be reproduced with commands:
cat > .config <<EOF
BR2_riscv=y
BR2_RISCV_64=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TARGET_EDK2=y
EOF
make olddefconfig
Then, building either with:
make --shuffle=reverse
Or:
utils/config -e BR2_PER_PACKAGE_DIRECTORIES
make olddefconfig
make -j$(nproc)
It is interesting to mention that when using "make --shuffle=reverse"
to build, the build can be completed if restarted only with "make". It
will not pull any other Buildroot package. This fact hints toward a
Makefile dependency issue internal to the EDK2 build system, rather
than in the Buildroot recipe.
The EDK2 build system is quite unique. See [2]. It generates files,
makefiles and internally uses GNU Make to compile code. This system is
likely not tested as being a sub-Make process in a complex Makefile
such as Buildroot.
In order to prevent Buildroot to pass unexpected Make flags to the
EDK2 sub-Make, this commit unset the MAKEFLAGS variable in the EDK2
build environment. This will put the EDK2 build script in a more
common and tested state. See GNU Make documentation about recursive use
of Make, more specifically [3].
Note: as mentioned, the build failure is likely due to an internal
issue of the EDK2 build system. The failure points to a missing
dependency in the EDK2 generator itself. This commit does not fix this
issue, but rather put the EDK2 build system in a normalized
environment, avoiding Buildroot flags being passed to the internal
EDK2 sub-Make invocation. The upstream EDK2 build system most likely
need a fix too.
Fixes:
make[2]: *** No rule to make target '/buildroot/output/build/edk2-edk2-stable202308/Build/RiscVVirtQemu/RELEASE_GCC5/RISCV64/MdeModulePkg/Application/UiApp/UiApp/DEBUG/UiApp.efi', needed by '/buildroot/output/build/edk2-edk2-stable202308/Build/RiscVVirtQemu/RELEASE_GCC5/FV/Ffs/462CAA21-7614-4503-836E-8AB6F4662331UiApp/UiApp.offset'. Stop.
build.py...
: error 7000: Failed to execute command
make tbuild [/buildroot/output/build/edk2-edk2-stable202308/Build/RiscVVirtQemu/RELEASE_GCC5/RISCV64/MdeModulePkg/Application/UiApp/UiApp]
build.py...
: error F002: Failed to build module
/buildroot/output/build/edk2-edk2-stable202308/MdeModulePkg/Application/UiApp/UiApp.inf [RISCV64, GCC5, RELEASE]
[1] https://lists.buildroot.org/pipermail/buildroot/2023-December/681507.html
[2] https://tianocore-docs.github.io/edk2-BuildSpecification/draft/4_edk_ii_build_process_overview/42_build_process_overview.html
[3] https://www.gnu.org/software/make/manual/make.html#Options_002fRecursion
Reported-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
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