http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52990
Bug #: 52990
Summary: bootstrap ia64 cross-compiler gcc (static C-only)
includes a broken libgcc.a due to libunwind
dependencies
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Target: ia64-linux-gnu
when building up a cross-compiler for ia64, we do:
- install binutils
- install kernel/C-library headers
- build a static C-only gcc compiler
- install glibc
- try to link a static ELF -> failure
this is due to libgcc on ia64 being dependent on libunwind symbols. when
shared libs are disabled, the libgcc.a ends up referring to __libunwind_xxx
symbols which aren't provided in the non-shared case.
specifically, we have:
- ia64 forces t-unwind in config.gcc which adds -DUSE_LIBUNWIND_EXCEPTIONS
- gcc/unwind-compat.c has a bunch of extern __libunwind_xxx decls
- libgcc/Makefile.in adds unwind-compat.o to libgcc.a when enable_shared!=yes
- gcc/config/ia64/unwind-ia64.c defines __libunwind_xxx aliases when SHARED
- unwind-ia64.o is only added to libunwind.{a,so} and never libgcc.a
so, the end libgcc.a gets unwind-compat.o which refers to __libunwind_xxx, but
doesn't get unwind-ia64.o which could possibly define them, and even if it did,
the aliases aren't enabled for static objects.
looks like we could fix this in the t-glibc-libunwind file, when enable_shared
is disabled, add the ia64 unwind objects to libgcc.a. additionally, have
unwind-ia64.c key off of not just SHARED but also STATIC_ONLY for declaring the
symbols, and have the t-glibc-unwind file build unwind-ia64.o with that.
