ARM C/C++ Code Generation Tools v18.12.8.LTS Release Notes
Table of Contents
1 Support Information
1.1 List of Resolved and Known Defects
Resolved defects
| ID | Summary |
|---|---|
| CODEGEN-8736 | Incorrect computation of condition test involving bool value |
| CODEGEN-8681 | 32-bit function parameters following 64-bit enum parameter are corrupted |
| CODEGEN-8640 | Incrementing a volatile bit-field leads to corrupted code |
| CODEGEN-8589 | Compiler intermittently crashes on switch with 20k cases |
| CODEGEN-8538 | Compiler does not honor attribute aligned when applied to function |
| CODEGEN-8529 | Cortex Thumb mode internal error when using intrinsic __curpc |
| CODEGEN-8485 | sscanf float conversion should fail and return 0 when input string starts with E or e |
| CODEGEN-8403 | Calling function expects struct floating point return value in wrong register for big-endian ARM targets with float support |
| CODEGEN-8389 | Including cmath causes remark: zero used for undefined preprocessing identifier “STDC_VERSION” |
| CODEGEN-8154 | The <strings.h> functions aren't declared extern “C” |
| CODEGEN-8100 | Compiler does not account for wraparound when different increment type added to signed int |
| CODEGEN-7956 | Compiler incorrectly elides short-circuit behavior of && when right operand might invoke undefined behavior |
| CODEGEN-7778 | Remove –asm_includes as CCS option |
| CODEGEN-5735 | Spurious warning when attribute((noinline)) applied to inline definition of member function |
| CODEGEN-1495 | ARM compiler incorrectly puts CPSIE and CPSID instructions into an IT block |
Open defects
| ID | Summary |
|---|---|
| CODEGEN-8576 | Loop that iterates a very large number of times causes compiler to fail with: Optimizer terminated abnormally |
| CODEGEN-8400 | Incorrect handling of floating point constant -0.0 |
| CODEGEN-6509 | Compiler error: no instance of function template matches the argument list |
| CODEGEN-6070 | Erroneous “redeclared with incompatible type” involving two tagless structs with same form |
| CODEGEN-5179 | When a symbol is remapped, DW_TAG_TI_branch/DW_AT_name is not updated |
| CODEGEN-5078 | Simple syntax error causes assembler to fail with INTERNAL ERROR |
| CODEGEN-4985 | Typo on ULP Advisor message |
| CODEGEN-4298 | Internal error when passing a temporary array of objects |
| CODEGEN-4297 | Cannot take the address of std::ctype<char>::table_size |
| CODEGEN-4296 | Undefined symbol isblank with -g or -ooff |
| CODEGEN-4290 | wstring runtime failure - likely bug in swprintf |
| CODEGEN-4281 | Unexpected type returned by bitset [] operator |
| CODEGEN-4276 | std::multimap::clear is not noexcept |
| CODEGEN-4275 | std::num_get does not parse floating-point strings correctly |
| CODEGEN-4259 | noexcept(typeid(d)) runtime fail on polymorphic class type |
| CODEGEN-4258 | deeply nested lambda functions hang the codegen |
| CODEGEN-4250 | regex_constants::ECMAScript not expected to be 0 |
| CODEGEN-4248 | armcl allows non-default arguments to be specified after default arguments |
| CODEGEN-4247 | Internal error when assigning default arguments to a parameter pack |
| CODEGEN-4246 | armcl allows illegal attribute in friend declarations |
| CODEGEN-4245 | Multiple non-variables may be declared using auto or decltype(auto) |
| CODEGEN-4244 | armcl errors on legal constexpr constructor call |
| CODEGEN-4234 | No error generated for lambda-expression in default argument cannot capture any entity. |
| CODEGEN-4228 | armcl fails to flag an inconsistent use of alignas between a declaration and definition of an object |
| CODEGEN-4203 | Parser errors on empty enum declaration |
| CODEGEN-4158 | TI compiler does not emit clang error: constexpr function never produces a constant expression |
| CODEGEN-4157 | error with using constexpr for return from end() with empty std::initializer_list |
| CODEGEN-4132 | cannot find matching “==” operator definition |
| CODEGEN-4124 | Failure to defer access control checks |
| CODEGEN-4122 | decltype cannot be used as a destructor name |
| CODEGEN-4119 | user-supplied allocator function is not called |
| CODEGEN-4105 | cannot find definition of “>=” operator |
| CODEGEN-4099 | Composing operations for valarray may fail to compile |
| CODEGEN-4091 | Incomplete class type when using various members of <iterator> |
| CODEGEN-4090 | Unimplemented core issue 475: std::uncaught_exception is not true when constructing the thrown object |
| CODEGEN-4076 | Exception propagating out of noexcept function does not call std::terminate |
| CODEGEN-4072 | Unimplemented core issue 1769: Catching a thrown derived class by reference to base clas |
| CODEGEN-4071 | <regex> never throws error_ctype |
| CODEGEN-4069 | std::linear_congruential_engine doesn't support 8-bit results |
| CODEGEN-4058 | std::function<T>::target_type() should return typeid(void) if target is empty |
| CODEGEN-4050 | shared_ptr::get_deleter() should return the original deleter class without copying |
| CODEGEN-4044 | libcxx istreambuf_iterator points to end of string instead of character past match |
| CODEGEN-4035 | Compiler allows constant subtraction between pointers to different objects |
| CODEGEN-4032 | wofstream << operator unexpected termination |
| CODEGEN-4026 | Non-standard partial ordering of variadic template partial specialization |
| CODEGEN-4015 | Access of const static member through pointer is not a constant expression. |
| CODEGEN-4002 | Undefined behavior on lambda capturing constexpr by reference |
| CODEGEN-4001 | Unimplemented core issue 588: Unqualified name lookup examines dependent base class |
| CODEGEN-4000 | Core 1601: Overload resolution for enum with fixed type |
| CODEGEN-3999 | Unimplemented core issue 1374: Conversion sequence ranks qualification before reference binding |
| CODEGEN-3998 | Unimplemented core issue 1951: cv-qualified void and scalar types are not literal types |
| CODEGEN-3993 | Constant initialiation may take place before dynamic initialization |
| CODEGEN-3991 | We do not issue diagnostics if an allocation function throws a non bad_alloc exception |
| CODEGEN-3966 | slice_array assignment failures |
| CODEGEN-3965 | Invalid conversion on static_cast from T1 to rvalue reference of T2 |
| CODEGEN-3964 | Unimplemented core issue 1467: Overloads and initializations with single-element initializer_list |
| CODEGEN-3963 | Unimplemented core issue 591: Name lookup in dependent base class that is also the current instantiation |
| CODEGEN-3962 | Core Issue 1804 unimplemented: friend declaration does not apply to class template specializations |
| CODEGEN-3961 | Pack expansion in template parameter list fails |
| CODEGEN-3959 | std::reference_wrapper doesn't define argument_type for classes containing a typedef member named argument_type |
| CODEGEN-3954 | Problem with std::swap and <tuple> |
| CODEGEN-3953 | scoped_allocator_adaptor can't be explicitly instantiated with two arguments |
| CODEGEN-3951 | Spurious error on bypassing initialization of trivially constructible objects |
| CODEGEN-3948 | Spurious syntax error on alignas in alias declaration |
| CODEGEN-3947 | Spurious error on unevaluated use of undefined constexpr function |
| CODEGEN-3946 | Spurious error on global qualifier of struct template |
| CODEGEN-3944 | Raw string d-char-sequence isn't supported |
| CODEGEN-3941 | operator<<(std::basic_ostream<K,T>&, const std::error_code&) is not defined in system_error |
| CODEGEN-3938 | std::rethrow_if_nested does not have standard signature |
| CODEGEN-3937 | nested_exception::rethrow_nested() not supported |
| CODEGEN-3916 | C++ header file cuchar is not provided in libc++ |
| CODEGEN-1499 | #pragma LOCATION and palign do not work together |
| CODEGEN-1498 | Automatic library build fails when an exact library name is used |
| CODEGEN-1484 | The armhex command does not handle spaces in the name of the output binary |
| CODEGEN-1101 | When the imaginary part of z is INFINITY, cprojf(z) is NOT equivalent to INFINITY + I * copysign(0.0, cimagf(z)) |
| CODEGEN-1059 | Compiler does not respect partial overrides in C99 designated initializers |
| CODEGEN-1026 | Disable diagnostic 1558 (–float_operations_allowed diagnostic) in standard header files |
| CODEGEN-989 | Should accept “LDRD R8,[R1]” in Thumb-2 mode |
| CODEGEN-975 | Missing half-precision float conversion functions |
| CODEGEN-974 | Missing __aeabi_read_tp |
| CODEGEN-972 | Missing AEABI_COMPATIBILITY_MODE link-time constants |
| CODEGEN-967 | Assembler accepts but mistranslates BLLT in v7 thumb mode |
| CODEGEN-966 | Should allow “ADD R0, R1, #0xfff” for v6m0 |
| CODEGEN-962 | Should accept 2-operand SUB SP in Thumb1/UAL mode |
| CODEGEN-927 | Should accept 2-operand add in ARM mode |
| CODEGEN-890 | The .label assembler directive should not be accepted when assembling for ELF. |
| CODEGEN-830 | __aeabi_dcmpun returns 1 for Inf and -Inf |
| CODEGEN-753 | Warning generated when using __curpc intrinsic on Thumb 2 |
| CODEGEN-662 | Double constant expression may be incorrectly truncated if assigned to a narrow integer type |
| CODEGEN-573 | Cortex-M0 library lacks uread4, etc. |
| CODEGEN-322 | Structure is not initialized correctly when using -o2 or -o3 optimization |
| CODEGEN-316 | The _ssat16 intrinsic allows literals in the range of 0-31, but the SSAT16 instruction only accepts values from 1-16 |
| CODEGEN-315 | _ssatl intrinsic allows 3rd argument to be 0 resulting in an assembler error. |
| CODEGEN-299 | ARM assembler does not issue a warning for PC-relative loads when –embedded_constants=off |
| CODEGEN-235 | Section relative ELF symbol values in partially linking object files should hold the section offset for the symbol |
| CODEGEN-104 | Linker gives misleading warning when dot expressions used in SECTION directive for .stack section |
| CODEGEN-63 | DWARF does not correctly represent variables stored in register pairs |
| CODEGEN-56 | Forward reference in .space generates an internal error |
1.2 Compiler Wiki
A Wiki has been established to assist developers in using TI Embedded Processor Software and Tools. Developers are encouraged to read and contribute to the articles. Registered users can update missing or incorrect information. There is a large section of compiler-related material. Please visit:
https://processors.wiki.ti.com/index.php?title=Category:Compiler
1.3 Compiler Documentation
The “TI ARM Optimizing Compiler User’s Guide” and the “TI ARM Assembly Language User’s Guide” can be downloaded from:
https://www.ti.com/tool/ARM-CGT
1.4 TI E2E Community
Questions concerning TI Code Generation Tools can be posted to the TI E2E Community forums. The Code Composer Studio support forum can be found at:
http://e2e.ti.com/support/tools/ccs/f/81
1.5 Defect Tracking Database
Issues filed against the TI compilers can be searched in the Code Generation Tools Defect Database.
1.6 Long Term Support release
The ARM CGT v18.12.x.LTS release is a long term support (LTS) release. This release will be supported for roughly 2 years with periodic bug fix updates.
2 Linker generated ECC option
In previous versions, linker generated ECC has been enabled via an ECC specifier on memory ranges in the linker command file. This makes it difficult for TI to provide linker command files with ECC specified because users need the ability to enable/disable the support. Starting with this version, users can enable/disable ecc support via the –ecc=[on|off] linker option. Existing users of ECC will need to specify –ecc=on
3 New utilies: objcopy, objdump, readelf, size
This release now includes below objcopy, objdump, readelf, and size utilities: arm-none-eabi-objcopy.exe arm-none-eabi-objdump.exe arm-none-eabi-readelf.exe arm-none-eabi-size.exe
NOTE: Above are windows executables names. Unix removes the exe suffix.
4 2011 version of the C language (C11)
The compiler supports the 2011 version of the C language. Compiling with the –c11 option causes the compiler to conform to the ISO/IEC 9899:2011 C standard. The compiler supports some features of C11 in the default relaxed ANSI mode.
C11 atomic operations are supported in default relaxed ANSI mode and in C11 mode as follows:
On ARM V7A8 (Cortex-A8), ARM V7M3 (Cortex-M3), ARM V7M4 (Cortex-M4), ARM V7R4 (Cortex-R4), or ARM V7R5 (Cortex-R5)) an atomic operation is implemented using processor supported exclusive access instructions.
On ARM V6M0 (Cortex-M0), an atomic operation is implemented by disabling interrupts across the operation.
On ARM V4 (ARM7), ARM V5e (ARM9E), or ARM V6 (ARM11) the atomic operations are not supported.
C11 threads.h is not supported.
5 MISRA-C 2004 Support Deprecation
Starting with ARM CGT v18.12.8.LTS, MISRA-C 2004 checking support has been deprecated. The existing MISRA checking functionality will remain in further patch versions of this compiler stream as is, but no further issues will be addressed.