[FS#3790] Grub2: Failed to build with GCC 10.30, glibc and binutils 2.36.1

[OpenWrt Bugs]

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User who did this - DazzyWalkman (DazzyWalkman) 

Attached to Project - OpenWrt/LEDE Project
Summary - Grub2: Failed to build with GCC 10.30, glibc and binutils 2.36.1
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I am trying to compile x64 builds up to commit: 
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=b607e7df34031738b18582aaa1f4f93505d06734
with toolchain options GCC 10.30, glibc and binutils 2.36.1 selected 
and ran into this bug: 
a very large lzma_decompress.img file is output. (e.g. 134479600 bytes instead of 2864.) This causes grub-mkimage to fail with: "error: Decompressor is too big."

There's already a fix upstream
build: Fix GRUB i386-pc build with Ubuntu gcc
https://git.savannah.gnu.org/cgit/grub.git/commit/?id=6643507ce30f775008e093580f0c9499dfb2c485

However, this upstreamed patch does not work well in OpenWRT buildroot, as it brings in python dependency and will triger an error of "'automake-1.15' is probably too old."   

Another patch works in my case, even it's superseded by a newer version from the summiter:
https://patchwork.ozlabs.org/project/buildroot/patch/20200527071932.2307442-1-fontaine.fabrice@gmail.com/

Build went fine before https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=b1ac59ed13926807289344cb0486ac077fc55023
with previous toolchain options of GCC 10.30, glibc and binutils 2.35.1 selected 
 

 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3790

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