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|Home > Migrating from RVCT v4.0 to ARM Compiler v4.1 > C and C++ library changes between RVCT v4.0 and ARM Compiler v4.1|
Various changes have been made to the ARM C and C++ library in ARM Compiler toolchain v4.1.
The libraries now use more 32-bit encoded Thumb code on targets that support Thumb-2
technology. This is expected to result in reduced code size without affecting performance.
The linker option
--no_thumb2_library falls back to the old-style libraries
Math function returns in some corner cases now conform to POSIX/C99 requirements. You can enable older behavior with:
#pragma import __use_rvct_matherr
From RVCT v4.0 09Q4 patch onwards, you can enable the newer behavior with:
#pragma import __use_c99_matherr.