The C front-end now defaults to C11 mode with GNU extensions, which
affects semantics of the inline keyword and brings several other
user visible changes, see https://gcc.gnu.org/gcc-5/porting_to.html for more details.
The GCC 5.1 Local Register Allocator now contains a rematerialization subpass,
on i?86/x86-64 is able to reuse the PIC hard register to improve performance
of position independent code, there is a simple interprocedural RA pass and
various other register allocation improvements were added.
GCC 5.1 adds partial support for the OpenACC standard, support for OpenMP 4.0
offloading to Intel's upcoming Xeon Phi accelerators and support for OpenACC
offloading to PTX. The Undefined Behavior Sanitizer in GCC has been extended
by adding various new runtime checks. An experimental GCC JIT library has
been added in GCC 5.1.
Note that the GCC versioning scheme changed recently, next major
release next year will be called GCC 6.1, next minor, bugfixing release
from the GCC 5 branch tentatively planned for end of June or July will be
GCC 5.2. See https://gcc.gnu.org/develop.html#num_scheme for details.
This release is available from the FTP servers listed here:
If you encounter difficulties using GCC 5.1, please do not contact me
directly. Instead, please visit http://gcc.gnu.org for information
about getting help.
Driving a leading free software project such as GNU Compiler Collection
would not be possible without support from its many contributors.
Not to only mention its developers but especially its regular testers
and users which contribute to its high quality. The list of individuals
is too large to thank individually!