https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87030
Bug ID: 87030 Summary: GCC fails to build with Xcode 10, attempting an impossible multilib build Product: gcc Version: 8.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap Assignee: unassigned at gcc dot gnu.org Reporter: fxcoudert at gcc dot gnu.org Target Milestone: --- Building with Xcode 10 (beta) on macOS 10.13 or 10.14 (beta), leads to a build failure because by default, configure sets GCC up for a multilib build. However, starting with Xcode 10, Apple has removed support for 32-bit: thus, the builds fails when trying to link libgcc, because it does not find the 32-bit system libc. Passing --disable-multilib fixes bootstrap. However, the default configure should detect that 32-bit is not supported and automatically build without 32-bit multilib.