Build Google gn build tool standalone

build-gn.sh

#!/usr/bin/env sh

set -euv

# Updated on April 2019 to reflect changes in GN
# See:
# https://github.com/ninja-build/ninja
# https://gn.googlesource.com/gn/

# We need a recent git
export PATH=/depot/git-2.8.3/bin:$PATH

# Directory where all the stuff will be built
rm -rf build_tools
mkdir build_tools
cd build_tools

# We install all to $HOME/bin
mkdir -p $HOME/bin

# Build ninja
git clone https://github.com/ninja-build/ninja.git
cd ninja
./configure.py --bootstrap
cp -f ninja $HOME/bin/
cd ..

# Setup tools for GN
export PATH=/depot/binutils-2.30/bin:/depot/gcc-6.2.0/bin:$HOME/bin:$PATH
export CC=gcc
export CXX=g++
export LDFLAGS=-lrt

# Build GN
git clone https://gn.googlesource.com/gn
cd gn
python build/gen.py
ninja -C out
# out/gn_unittests
cp -f out/gn $HOME/bin

ninja: Entering directory `out'
[1/37] LINK gn
FAILED: gn
clang++ -L/usr/local/opt/libffi/lib -O3 -fdata-sections -ffunction-sections -Wl,-dead_strip -mmacosx-version-min=10.9 -pthread -o gn src/gn/gn_main.o base.a gn_lib.a
ld: warning: ignoring file base.a, building for macOS-x86_64 but attempting to link with file built for unknown-unsupported file format ( 0x21 0x3C 0x61 0x72 0x63 0x68 0x3E 0x0A 0x2F 0x20 0x20 0x20 0x20 0x20 0x20 0x20 )
ld: warning: ignoring file gn_lib.a, building for macOS-x86_64 but attempting to link with file built for unknown-unsupported file format ( 0x21 0x3C 0x61 0x72 0x63 0x68 0x3E 0x0A 0x2F 0x20 0x20 0x20 0x20 0x20 0x20 0x20 )
Undefined symbols for architecture x86_64:
"base::CommandLine::ForCurrentProcess()", referenced from:
_main in gn_main.o
"base::CommandLine::Init(int, char const* const*)", referenced from:
_main in gn_main.o
"base::CommandLine::GetArgs() const", referenced from:
_main in gn_main.o
"commands::kHelp", referenced from:
_main in gn_main.o
"MsgLoop::MsgLoop()", referenced from:
_main in gn_main.o
"commands::GetCommands()", referenced from:
_main in gn_main.o
"base::CommandLine::HasSwitch(char const*) const", referenced from:
_main in gn_main.o
"Location::Location()", referenced from:
_main in gn_main.o
"PrintShortHelp(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&, std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&)", referenced from:
_main in gn_main.o
"commands::CommandSwitches::Init(base::CommandLine const&)", referenced from:
_main in gn_main.o
"OutputString(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&, TextDecoration, HtmlEscaping)", referenced from:
_main in gn_main.o
"Err::PrintToStdout() const", referenced from:
_main in gn_main.o
"switches::kVersion", referenced from:
_main in gn_main.o
"Err::Err(Location const&, std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&, std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&)", referenced from:
_main in gn_main.o
"MsgLoop::~MsgLoop()", referenced from:
_main in gn_main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[14/37] CXX src/gn/runtime_deps_unittest.o