Table of Contents
This section documents Sourcery CodeBench Lite changes for each released revision.
Installer PATH
bug fix.
An installer bug that caused it to set the
PATH
variable incorrectly has been fixed.
CS3 missing 2008 NaN multilib linker scripts bug fix. Missing linker scripts targeting Malta and SEAD-3 boards have been added for the 2008 NaN multilibs.
GDB support for removing symbols.
GDB now supports the remove-symbol-file
command.
Refer to the GDB manual for full documentation.
cs-rm -f
bug fix.
A bug that caused cs-rm -f
on
Windows hosts to incorrectly issue an error when
passed a glob pattern that matched nothing has been
fixed.
C++ exception handling format. The C++ exception handling format has been changed to fix a defect in the specification. The new format is not backwards-compatible with code produced by Sourcery CodeBench beginning with 2012.09 releases; you should recompile all C++ code using exceptions. The compatibility issue does not affect code produced by older Sourcery CodeBench Lite releases or third-party libraries built with other compilers.
IEEE 754 soft float NaN interpretation bug fixes. The IEEE 754 soft-float emulation libraries have been corrected to consistently use the legacy NaN representations.
Exception handling bug fix. A bug that sometimes caused an incorrect call to terminate during exception handling has been fixed.
N64 ABI fast software floating-point libraries. A bug in GCC has been fixed that caused the fast software floating-point libraries to be disabled for the N64 ABI.
Temporary register assembler bug fix.
A bug has been fixed that caused $zero
to
be used as a temporary register for address calculation on
some loads targeting that register.
Assembler bug fix for .stab
directives.
An assembler bug has been fixed that caused incorrect code to
be generated when .stab
directives were used in
microMIPS or MIPS16 mode.
Assembler bug fix for microMIPS symbol loads. An assembler bug has been fixed that caused some microMIPS symbols to be loaded from an incorrect address.
N64 linker assertion failure fix.
A linker bug has been fixed that caused an assertion failure when
linking N64 code using the special __ehdr_start
symbol.
N64 FPU emulation bug fix. A bug in the CS3 FPU emulation library has been fixed that made N64 hard-float code execute incorrectly on non-FPU processors.
GDB CP0 register access bug fix. A bug in GDB has been fixed that made CP0 registers inaccessible.
Debug Sprite spurious error message bug fix.
A bug in the Sourcery CodeBench Debug Sprite has been fixed that caused
a spurious Error initializing the target
message upon startup in the attachment (-a
) mode.
Conditional expression bug fix. A bug that caused an internal compiler error in some programs with conditional expressions has been fixed.
Missed optimization.
A bug that caused GCC to miss an opportunity to use short
instructions when compiling with -mmicromips
has been fixed.
Exception handling bug fix. A bug that sometimes caused incorrect results when using C++ exception specifications has been fixed.
Incorrect optimization bug fix.
A compiler bug has been fixed that caused incorrect code to be
generated for some comparisons unless optimization was suppressed
with -fno-forward-propagate
.
GCC version 4.7.3.
Sourcery CodeBench Lite for MIPS ELF is now based on GCC
version 4.7.3. This update incorporates numerous bug fixes.
For more information, see
http://gcc.gnu.org/gcc-4.7/changes.html
.
GCC option -meva
.
GCC now passes the -meva
command-line
option to GAS.
IEEE 754-2008 features and multilibs added.
Support for some IEEE 754-2008 floating-point arithmetic
standard features has been added to the toolchain for
processors that implement them. This includes changes to the
compiler, binutils, the dynamic linker and floating-point
environment library functions. The changes enable support
for the recommended encoding of NaN data introduced by the
said revision of the standard as well as the use of the
floating-point ABS.fmt
and NEG.fmt
instructions in a non-arithmetic manner. Multilibs built
with the updated encoding of NaN data have been added. For
information as to how to control these features, please refer
to the compiler and assembler manuals.
Linker --gc-sections
crash fix.
A bug that caused the linker to sometimes crash when
using --gc-sections
has been fixed.
Improved error message for incompatible object files. The linker error message emitted when attempting to link objects with incompatible error handling formats now includes the object names.
Binutils update. The binutils package has been updated to version 2.23.52.20130219 from the FSF trunk. This update includes numerous bug fixes.
Installer warnings fixed.
A bug that caused Gtk warnings relating to
libappmenu.so
when running the installer
on 64-bit Ubuntu GNU/Linux hosts has been fixed.
microMIPS FPU emulation bug fix.
Support for the missing microMIPS RECIP.fmt
and
RSQRT.fmt
instructions has been added to the CS3 FPU
emulation library.
IEEE 754 integer conversion bug fix.
A bug in the CS3 FPU emulator has been fixed that caused integer
conversion instructions to produce incorrect results. The bug
triggered for the minimum valid, out-of-range, infinite and NaN
inputs to the CEIL.L.fmt
, CEIL.W.fmt
,
CVT.L.fmt
, CVT.W.fmt
,
FLOOR.L.fmt
, FLOOR.W.fmt
,
ROUND.L.fmt
, ROUND.W.fmt
,
TRUNC.L.fmt
, and TRUNC.W.fmt
instructions run on processors without an FPU as well as
processors whose FPU traps to the emulator for any of such inputs.
IEEE 754 signaling NaN interpretation bug fix. A bug in the CS3 FPU emulator has been fixed that caused legacy signaling NaN data encoded with a zero payload to be interpreted as quiet NaN data. As a result IEEE 754 exception state was not set correctly for floating-point operations receiving such data as input. The bug affected hard-float code run on processors without an FPU as well as processors whose FPU traps to the emulator for signaling NaN input.
MIPS32r2 FPU emulation bug fix. The CS3 FPU emulation library now correctly supports multiply-accumulate and reciprocal approximation instructions in MIPS32r2 code.
CS3 FPU emulator IEEE 754 features.
The CS3 FPU emulation library now supports some of the IEEE
754-2008 standard features recently added to the MIPS architecture.
These are a new encoding of NaN data and a different treatment
of ABS.fmt
and NEG.fmt
instructions
as well as the associated new Floating Point Control and Status
register state to switch between the IEEE 754-2008 and legacy
mode.
Improved source line stepping.
GDB and gdbserver
now implement range stepping,
which improves the performance of single stepping over a source
line by reducing the number of control messages from GDB.
GDB hang fix. A bug that caused GDB to sometimes hang when setting a breakpoint has been fixed.
Sprite remote communication bug fix.
A bug in the Sourcery CodeBench Debug Sprite that caused it to
exit with the error Remote communication error.
Target disconnected.: Invalid argument.
on some
Microsoft Windows hosts has been fixed.
Debug Sprite with multiple connections.
The Sourcery CodeBench Debug Sprite now works correctly when using
multiple connections (-m
) with the Mentor
Embedded Sourcery Probe. Previously, the Sprite exited with
an error after the first connection.
Debug Sprite source line stepping improvement. The Sourcery CodeBench Debug Sprite now supports range stepping when used with debug devices that implement this MDI feature.
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.