I am attempting to update our build infrastructure to use GN which requires 
using clang and producing static libs. 

I see there is now a v8_static_library argument to gn. So i have created a 
args.gn that looks something like

is_debug = false
target_cpu = "x64"
v8_static_library = true
is_component_build = true
v8_use_external_startup_data = false

then I execute ninja -C out.gn/foo -j 1 as usual (-j 1 to just debug any 
issues)

I now get the following error

$ ninja -C out.gn/foo -j 1 
ninja: Entering directory `out.gn/foo' 
[7/1419] LIBTOOL-STATIC obj/libv8_version.a 
FAILED: obj/libv8_version.a 
rm -f obj/libv8_version.a && TOOL_VERSION=1485597133 python 
../../build/toolchain/mac/filter_libtool.py libtool -static -o 
obj/libv8_version.a 
error: 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool:
 
no files specified 
Usage: 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool
 
-static [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] 
[-sacLT] [-no_warning_for_no_symbols] 
Usage: 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool
 
-dynamic [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] 
[-o output] [-install_name name] [-compatibility_version #] 
[-current_version #] [-seg1addr 0x#] [-segs_read_only_addr 0x#] 
[-segs_read_write_addr 0x#] [-seg_addr_table <filename>] 
[-seg_addr_table_filename <file_system_path>] [-all_load] [-noall_load] 
ninja: build stopped: subcommand failed.


I also notice that building with clang on osx requires at least clang 3.9 
due to the usage of no-undefined-var-template. Clang 8.0.0.0 appears to be 
branched before this landed in 3.9 is there a way to have gclient or gn 
pull down a correct version of llvm and its associated tooling to build v8?



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