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clang++ out/amalgamated/perfetto.cc -o out/amalgamated/libperfetto.so -shared -Wall -Werror -Weverything -Wextra -Wformat -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-c99-designator -Wno-deprecated -Wno-disabled-macro-expansion -Wno-documentation-unknown-command -Wno-gnu-include-next -Wno-gnu-statement-expression -Wno-gnu-zero-variadic-macro-arguments -Wno-padded -Wno-poison-system-directories -Wno-reserved-id-macro -Wno-undef -Wno-unknown-sanitizers -Wno-unknown-warning-option -Wno-unused-const-variable -Wno-zero-as-null-pointer-constant -Wpedantic -fPIC -fno-exceptions -fvisibility=hidden -std=c++11 -lprotoc -lpthread -lrt

$ tools/gn gen out/arm64 '--args=is_clang=true is_debug=false target_os="linux" target_cpu="arm64" target_sysroot="/usr/aarch64-linux-gnu" target_gcc_toolchain="/usr"'
Done. Made 853 targets from 148 files in 640ms
$ tools/ninja -C out/arm64 traced traced_probes perfetto
ninja: Entering directory `out/arm64'
ninja: error: '../../.git/HEAD', needed by 'gcc_like_host/gen/perfetto_version.gen.h', missing and no known rule to make it
Cleaning up file based variables
ERROR: Job failed: exit code 1