http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60817
Bug ID: 60817 Summary: gcc configure script misdetects TLS support on x86_64-pc-solaris* with gnu as Product: gcc Version: 4.9.0 Status: UNCONFIRMED Severity: minor Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: redlizard at redlizard dot nl Created attachment 32584 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32584&action=edit Proposed patch. When building gcc >= 4.7 on x86_64-pc-solaris2.11 --with-gnu-as, the gcc/configure script incorrectly decides that gnu as does not support real TLS, and so unnecessarily decides to activate emutls instead. The solaris-specific test checks this support by trying to assemble a piece of TLS-using assembly code, and it uses the same 32-bit code for this test both on 32-bit and 64-bit platforms. The solaris assembler will accept this, but gnu as fails on the 32 bit code when targeting x86_64-pc-solaris*, thus causing the detection to fail. Attached patch for 4.9 fixes the problem, and is trivially backported to 4.8 and 4.7.