Table of Contents
This section documents Sourcery CodeBench Lite changes for each released revision.
Fast software floating-point libraries. A bug that caused the fast software floating-point libraries to be disabled has been fixed.
microMIPS branch generation fixed.
A bug in GCC has been fixed that caused it to generate out-of-range
microMIPS branches, which resulted in a linker error
relocation truncated to fit: R_MICROMIPS_PC16_S1
.
Compact C++ language-specific data.
GCC now defaults to emitting a compact encoding of the
C++ language-specific data for exception handling.
For more information, refer to the documentation of the
-mcompact-eh
and
-mno-compact-eh
options in the GCC manual.
Pointer comparison bug fixed. A bug in GCC that caused it to incorrectly optimize away a pointer comparison has been fixed.
Loop optimization bug fix.
A compiler bug that caused some forms
of loop to be mis-optimized when using the
-fpromote-loop-indices
option
has been fixed.
Wrong-code bug fix. A bug in GCC's scheduler has been fixed that sometimes caused incorrect code to be generated.
Performance regression fixed. A bug that introduced unnecessary instructions to
zero-extend unsigned char
or short
values
has been fixed.
Linker raw binary input crash fix.
A bug that caused the linker to crash when linking binary
inputs (--format=binary
) while using
--gc-sections
has been fixed.
Assembler bug fixes.
Assembler bugs have been fixed that caused assembly errors or
incorrect code to be produced for the LUI
instruction, microMIPS B16
, BEQZ16
,
and BNEZ16
suffixed instruction mnemonics, as well
as 32-bit microMIPS instructions placed in a 16-bit delay slot
of a branch or a jump.
Install to empty directory failure fixed. A bug that prevented installation of Sourcery CodeBench Lite into an existing empty directory has been fixed.
CS3 linking fix.
A bug has been fixed that caused relocation truncated
to fit
errors when linking the CS3 libraries against
object files compiled with a -G
option value
less than 4.
ssize_t
type definition bug fix.
The definition of the POSIX ssize_t
data type has
been corrected for 64-bit targets to match the width of the ISO
C size_t
type.
GCC version 4.7.2.
Sourcery CodeBench Lite for MIPS ELF is now based on GCC
version 4.7.2. For more information about changes from GCC
version 4.6 that was included in previous releases, see
http://gcc.gnu.org/gcc-4.7/changes.html
.
Optimization bug fix.
A GCC bug has been fixed that caused incorrect code to be
generated for builtin_unreachable
when optimizing.
Linker crash bug fix.
A bug has been fixed that caused the linker to crash
when using customized linker scripts without a
.eh_frame_hdr
output section description.
Assembler %hi
and %lo
operator bug fixes
.
Several bugs have been fixed in the handling of
%hi
and %lo
assembly
operators applied to expressions involving forward symbol
references. The bugs caused the assembler to fail with a
relocation overflow
error message or to
produce incorrect code.
Linker script symbols.
The linker now supports a new HIDDEN
keyword to define
symbols with object scope. Refer to the linker manual for details.
microMIPS SWXC1
instruction encoding bug fix
.
A bug in the encoding of the microMIPS SWXC1
instruction has been fixed. The bug caused LWXC1
to be produced by the assembler and listed by the disassembler
instead.
Binutils version 2.23. Sourcery CodeBench Lite for MIPS ELF is now based on binutils version 2.23.
EVA instruction assembler bug fix. An assembler bug in branch delay slot optimization involving EVA instructions has been fixed.
Assembler internal error bug fix.
A bug has been fixed that caused the assembler to sometimes fail
with a fixup not contained within frag
error
message. The bug was triggered by the branch delay slot
optimization, not normally used for compiler-generated code.
N64 MDI semihosting bug fix. A bug in MDI semihosting has been fixed that caused incorrect return values for the N64 ABI.
GDB update.
The included version of GDB has been updated to
7.4.50.20120716. This update adds numerous bug fixes and
features. Refer to http://www.gnu.org/software/gdb/news
for more information.
Non-stop support. The Sourcery CodeBench Debug Sprite now supports non-stop debugging.
Updated system requirements. The host operating system requirements for Sourcery CodeBench Lite have been updated. The minimum versions of GNU/Linux now supported are Red Hat Enterprise Linux 5, SuSE Enterprise Linux 10, Fedora Core 6, Ubuntu 8.04, and Debian 5, or later versions of these distributions running on 32-bit or 64-bit Intel or AMD CPUs.
__attribute__((nomips16))
code generation bug fix
.
A bug in GCC that caused incorrect code to be generated for
functions with the __attribute__((nomips16))
attribute while compiling with -mips16
has
been fixed.
C++ bug fix. A bug that caused unpredictable program behavior in C++ programs has been fixed.
Invalid microMIPS relocation fixed.
A bug in branch code generation for microMIPS, reported by the
linker as relocation truncated to fit:
R_MICROMIPS_PC16_S1
, has been fixed.
Improved size optimization for microMIPS.
The compiler now aligns microMIPS functions more
efficiently when the -Os
option is used.
Compiler crash fixed. A GCC bug that occasionally caused an internal compiler error during register allocation has been fixed.
Register allocation bug fix. A bug in the register allocator that caused incorrect code generation has been fixed.
Linker --gc-sections
bug fix.
A linker bug that incorrectly caused undefined references to be
diagnosed when the --gc-sections
option is used
has been fixed.
EVA support.
GAS now supports MIPS EVA instructions.
You can specify the -meva
option to
GCC and GAS to indicate that EVA instructions are being
used.
Nondeterministic code generation bug fix. A GCC bug has been fixed that caused nondeterministic code generation for some input files when optimizing.
GCC version 4.6.
Sourcery CodeBench Lite for MIPS ELF is now based on GCC
version 4.6. For more information about changes from GCC
version 4.5 that was included in previous releases, see
http://gcc.gnu.org/gcc-4.6/changes.html
.
Fix for internal compiler error.
A GCC bug has been fixed that caused an internal compiler
error when using pointer casts in C++0x constexpr
initialization expressions.
Compact C++ exception handling tables.
GCC now defaults to emitting a compact encoding of C++ exception
handling tables, rather than using a DWARF-based scheme.
For more information, refer to the documentation of the
-mcompact-eh
and
-mno-compact-eh
options in the GCC manual.
Fix for bit-field optimization bug. A compiler bug that caused incorrect code to be generated for programs using bit-fields has been fixed.
Incorrect accesses to volatile memory.
The compiler no longer generates SWP, LWP, SWM or LWM instructions
to access objects declared with the volatile
type
qualifier, as these instructions can cause multiple memory accesses
of unspecified ordering.
GCC version 4.6.3.
Sourcery CodeBench Lite for MIPS ELF is now based on GCC
version 4.6.3. For more information about issues that
have been fixed since version 4.6.1, see
http://gcc.gnu.org/gcc-4.6/changes.html
.
GCC stack usage improvement.
GCC now generates better code for stack allocation in some
cases when compiling with -fno-strict-aliasing
.
Linker --gc-sections
option bug fix.
A bug has been fixed that caused the linker to incorrectly
remove the .debug_types
section when using the
--gc-sections
option.
Installer failure during upgrade.
Some recent releases were affected by an installer bug
on Windows hosts that caused installing a newer version of
Sourcery CodeBench Lite into the same directory to fail with the error
Sourcery CodeBench Lite for MIPS ELF upgrade failed
.
This bug has now been fixed, but the affected releases cannot be
upgraded. As a workaround, uninstall the older release before
installing the new version.
C++ debugging bug fix.
A GDB bug has been fixed that caused GDB to fail to
find enum
constants in base classes when
debugging C++ code.
Fix for crash in GDB.
A memory corruption bug in GDB has been fixed that under very rare
circumstances made it crash or exhibit other unpredictable behavior.
On GNU/Linux hosts, this bug caused crashes with an error message
similar to: *** glibc detected *** mips-sde-elf-gdb:
free(): invalid next size (normal): 0x09466198 ***
followed by a backtrace.
Fix debugger remote target interruption. A bug in GDB's handling of requests to interrupt execution on a remote target has been fixed that caused it to stop the target but not emit a stopped MI record.
GDB internal error fix.
A bug has been fixed that caused GDB to produce messages of
the form: warning: (Internal error: pc 0x1000a0 in
read in psymtab, but not in symtab.)
when taking the addresses of symbols from objects added with
the add-symbol-file
command.
64-bit multilibs.
Sourcery CodeBench Lite now includes libraries and linker scripts to build
applications for MIPS64R2 N64 ABI. Use the -mabi=64
option to compile using 64-bit multilibs, and linker scripts for
the Malta board with a 64-bit processor
(e.g., malta64-ram-hosted.ld
to link executables.
Multilibs for the N64 ABI are available for all combinations of
big/little endianness and hardware/software floating point.
Refer to Section 3.2, “Library Configurations” for more information
about the 64-bit multilibs.
GCC crash bug fix. A GCC bug has been fixed that caused an internal compiler error when a MIPS16 function was inlined into a MIPS32 function.
GCC optimization bug fix.
A bug in the GCC optimizer has been fixed that caused incorrect
code to be generated for some cases of multiplication by a
constant when compiling with -O2
or
-O3
.
GCC wrong code fix. An optimizer bug has been fixed that caused GCC to generate code with incorrect scheduling of memory reference instructions.
Fix for assembler internal error.
A bug has been fixed that caused the assembler to abort with an
assertion failure in emit_inc_line_addr
.
Changes to included libraries.
Library variants built with -mfp64
,
-mno-float
, and -mcode-readable=no
have been removed from Sourcery CodeBench Lite for MIPS ELF. Please
refer to Section 3.2, “Library Configurations” for a list of the
currently-supported multilibs.
Fix for compiler hang. A bug that caused GCC to become stuck in an infinite loop in the optimizer has been fixed.
Optimization bug fix.
A compiler bug has been fixed that affected some programs using
type-aliased assignments to pointer variables. The bug caused
incorrect code to be generated when compiled with
-O2
or -O3
.
Binutils version 2.21. Sourcery CodeBench Lite for MIPS ELF is now based on binutils version 2.21.
Assembler crash.
The assembler now warns when there is line information for
the *ABS*
section, rather than crash.
This can occur when the .offset
directive is
used incorrectly.
Fix for crash in GDB maint print arch
.
A bug in the GDB command maint print arch
that sometimes caused GDB to crash has been fixed.
Remote command bug fix.
A bug in the Sourcery CodeBench Debug Sprite has been fixed that caused
GDB's monitor
remote commands to fail without
performing the intended action on some versions of Windows.
Debug Sprite option defaults. The Sourcery CodeBench Debug Sprite now uses default option values specified in board configuration files. Options included in the device URL override the default values.
Changes to host operating system requirements. The minimum required Microsoft Windows OS needed to run Sourcery CodeBench Lite is now Windows XP (SP1).