soft-fp: Adjust call to abort for kernel use

System Internals / glibc - Joseph Myers [codesourcery.com] - 20 February 2015 12:07 UTC

soft-fp calls abort in various cases that the code doesn't handle, all cases that should never actually occur for any supported choice of types.

Calling an abort function is not appropriate for kernel use, so the Linux kernel redefines abort as a macro in various ways in the ports using this code, typically to "return 0" or similar.

One use of abort in soft-fp is inside a comma expression and doesn't work with such a macro. This patch changes it to use a statement expression.

Tested for powerpc-nofpu that installed shared libraries are unchanged by this patch.

(There are two classes of aborts: those to make control flow visible to the compiler, in default cases of switches over _FP_CLS_COMBINE, which could reasonably change to __builtin_unreachable for glibc but would still need to handle pre-4.5 compilers for kernel use, and those intended to detect any use of soft-fp for combinations of types the code doesn't know how to handle, which could reasonably become link failures if the calls should always be optimized away. But those are separate possible future enhancements.)

- soft-fp/op-common.h (_FP_FROM_INT): Wrap call to abort in expression inside statement expression.

e4a399d soft-fp: Adjust call to abort for kernel use.
ChangeLog | 5 +++++
soft-fp/op-common.h | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)

Upstream: sourceware.org

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