Append -pthread to linker options

This fixes the following error on Arm Linux (Raspberry Pi) symbol lookup error: ***/gems/ffi-1.15.0/lib/ffi_c.so: undefined symbol: pthread_atfork Fixes #893
ffi · May 22, 2021 · 54db5ef · 54db5ef · printfinn · May 22, 2021
1 parent 4ad6fd5
commit 54db5ef
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/ext/ffi_c/extconf.rb b/ext/ffi_c/extconf.rb
@@ -57,6 +57,9 @@ def system_libffi_usable?
     append_ldflags "-Wl,--exclude-libs,ALL"
   end
 
+  # Some linux archs need explicit linking to pthread, see https://github.com/ffi/ffi/issues/893
+  append_ldflags "-pthread"
+
   ffi_alloc_default = RbConfig::CONFIG['host_os'] =~ /darwin/i && RbConfig::CONFIG['host'] =~ /arm|aarch64/i
   if enable_config('libffi-alloc', ffi_alloc_default)
     $defs << "-DUSE_FFI_ALLOC"