INFO:2026-09-17T21:36:08Z:root:pulling...
From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   cd0243343275..697570d3ca9f  main       -> origin/main
Switched to branch 'main'
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HEAD is now at 697570d3ca9f [Github] Bump tooling containers to 26.04 (#224052)
INFO:2026-09-17T21:36:11Z:root:syncing...
Deleted branch merge (was 894f7a5572ae).
Switched to a new branch 'merge'
branch 'merge' set up to track 'origin/main'.
[merge 2043a3fce6f8] [gn build] Port e78fdeba3f9a
 1 file changed, 1 deletion(-)
[gn build] Port e78fdeba3f9a -- https://github.com/llvm/llvm-project/commit/e78fdeba3f9a
INFO:2026-09-17T21:36:13Z:root:building
ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/485] COPY ../../libcxxabi/include/cxxabi.h include/c++/v1/cxxabi.h
[2/485] COPY ../../libcxxabi/include/__cxxabi_config.h include/c++/v1/__cxxabi_config.h
[3/485] ACTION //libcxx/include:copy_headers(//llvm/utils/gn/build/toolchain:unix)
[4/485] CXX obj/llvm/lib/Object/Object.GOFFObjectFile.o
FAILED: obj/llvm/lib/Object/Object.GOFFObjectFile.o 
../../../chrome/src/third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/llvm/lib/Object/Object.GOFFObjectFile.o.d -o obj/llvm/lib/Object/Object.GOFFObjectFile.o -c ../../llvm/lib/Object/GOFFObjectFile.cpp  -I../../llvm/include -Igen/llvm/include -Igen/llvm/include/llvm/IR -I. -O3 -fdiagnostics-color -Wall -Wextra -Wno-unused-parameter -Wdelete-non-virtual-dtor -Wstring-conversion -no-canonical-prefixes -Werror=date-time -fdebug-compilation-dir=. --sysroot=../../sysroot -Wpoison-system-directories -fPIC -Wcovered-switch-default -std=c++17 -fvisibility-inlines-hidden -fno-exceptions -fno-rtti
../../llvm/lib/Object/GOFFObjectFile.cpp:899:30: error: no member named 'formatv' in namespace 'llvm'
  899 |   std::string HexStr = llvm::formatv("R_{0:x-8}", RelType).str();
      |                        ~~~~~~^
1 error generated.
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.