Ruby FFI fails to install if Xcode path has spaces in it

[justin-espedal]

I have Xcode installed to an external hard drive named "Big Sur": /Volumes/Big Sur/Applications/Xcode-13-beta4.app

Attempting to install cocoapods, which depends on Ruby FFI, I run into this error.

gem install cocoapods
Fetching httpclient-2.8.3.gem
Fetching concurrent-ruby-1.1.10.gem
Fetching fuzzy_match-2.0.4.gem
Fetching nap-1.1.0.gem
Fetching i18n-1.10.0.gem
Fetching tzinfo-2.0.4.gem
Fetching zeitwerk-2.5.4.gem
Fetching activesupport-6.1.5.1.gem
Fetching algoliasearch-1.27.5.gem
Fetching typhoeus-1.4.0.gem
Fetching netrc-0.11.0.gem
Fetching ffi-1.15.5.gem
Fetching ethon-0.15.0.gem
Fetching public_suffix-4.0.7.gem
Fetching addressable-2.8.0.gem
Fetching cocoapods-core-1.11.3.gem
Fetching claide-1.1.0.gem
Fetching cocoapods-plugins-1.0.0.gem
Fetching cocoapods-deintegrate-1.0.5.gem
Fetching cocoapods-downloader-1.6.3.gem
Fetching cocoapods-try-1.2.0.gem
Fetching atomos-0.1.3.gem
Fetching colored2-3.1.2.gem
Fetching cocoapods-search-1.0.1.gem
Fetching nanaimo-0.3.0.gem
Fetching cocoapods-trunk-1.6.0.gem
Fetching molinillo-0.8.0.gem
Fetching escape-0.0.4.gem
Fetching fourflusher-2.3.1.gem
Fetching gh_inspector-1.1.3.gem
Fetching rexml-3.2.5.gem
Fetching cocoapods-1.11.3.gem
Fetching xcodeproj-1.21.0.gem
Fetching ruby-macho-2.5.1.gem
Successfully installed concurrent-ruby-1.1.10
Successfully installed i18n-1.10.0
Successfully installed tzinfo-2.0.4
Successfully installed zeitwerk-2.5.4
Successfully installed activesupport-6.1.5.1
Successfully installed nap-1.1.0
Successfully installed fuzzy_match-2.0.4
Successfully installed httpclient-2.8.3
Successfully installed algoliasearch-1.27.5
Building native extensions. This could take a while...
ERROR:  Error installing cocoapods:
	ERROR: Failed to build gem native extension.

    current directory: /Users/justin/.gem/gems/ffi-1.15.5/ext/ffi_c
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20220502-60942-11mux89.rb extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi,/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/ffi,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/ffi... yes
checking for ffi_prep_closure_loc() in -lffi... yes
checking for ffi_prep_cif_var()... yes
checking for ffi_raw_call()... yes
checking for ffi_prep_raw_closure()... yes
checking for whether -pthread is accepted as LDFLAGS... yes
creating extconf.h
creating Makefile

current directory: /Users/justin/.gem/gems/ffi-1.15.5/ext/ffi_c
make "DESTDIR=" clean

current directory: /Users/justin/.gem/gems/ffi-1.15.5/ext/ffi_c
make "DESTDIR="
make: *** No rule to make target `"/Volumes/Big', needed by `AbstractMemory.o'.  Stop.

make failed, exit code 2

Gem files will remain installed in /Users/justin/.gem/gems/ffi-1.15.5 for inspection.
Results logged to /Users/justin/.gem/extensions/universal-darwin-21/2.6.0/ffi-1.15.5/gem_make.out

Here are a few relevant lines from the generated Makefile:

topdir = /Volumes/Big\ Sur/Applications/Xcode-13-beta4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0
arch_hdrdir = "/Volumes/Big Sur/Applications/Xcode-13-beta4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/universal-darwin21"
includedir = $(DESTDIR)/Volumes/Big Sur/Applications/Xcode-13-beta4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk$(prefix)/include

topdir and arch_hrdir seem to escape or quote the path, but includedir doesn't, so I'm assuming that's where the issue lies.

[justin-espedal]

There's also this open issue related to paths with spaces, but it seems to be a different specific error. #623