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Update llvmlibc.md documentation to include AArch64 support and heap. #521

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Oct 4, 2024
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Update llvmlibc.md documentation to include AArch64 support and heap. #521

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10 changes: 7 additions & 3 deletions docs/llvmlibc.md
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Expand Up @@ -47,6 +47,13 @@ following command line options, in addition to `--target`, `-march` or
the symbol `__stack` in addition to whatever other memory layout you
want.

* `-Wl,__llvm_libc_heap_limit=0x`_nnnnnn_ if you are using the heap.
The heap start defined by the value of the symbol `_end` which will
be defined by the linker if no linker script is used. Alternatively
use a linker script that defines the symbols `_end` and
`__llvm_libc_heap_limit` in addition to whatever other memory layout
you want.

For example:

```
Expand All @@ -55,9 +62,6 @@ clang --config=llvmlibc.cfg --target=arm-none-eabi -march=armv7m -o hello hello.

## Limitations of LLVM libc in LLVM Embedded Toolchain for Arm

At present, this toolchain only builds LLVM libc for AArch32, not for
AArch64.

At present, this toolchain does not build any C++ libraries to go with
LLVM libc.

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