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-rw-r--r--ext/rbconfig/sizeof/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/rbconfig/sizeof/extconf.rb b/ext/rbconfig/sizeof/extconf.rb
index 3006436fac..efbdeb7d6a 100644
--- a/ext/rbconfig/sizeof/extconf.rb
+++ b/ext/rbconfig/sizeof/extconf.rb
@@ -35,5 +35,6 @@ check_sizeof('_Decimal64') # x86_64 ABI
check_sizeof('_Decimal128') # x86_64 ABI
check_sizeof('__m64') # x86_64 ABI (optional)
check_sizeof('__m128') # x86_64 ABI (optional)
+check_sizeof('__float80') # gcc x86
create_makefile('rbconfig/sizeof')