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Date: Fri, 13 May 2022 11:05:46 +0000
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From: Ekaitz Zarraga <ekaitz@elenq.tech>
Cc: Andrew Waterman <andrew@sifive.com>
Reply-To: Ekaitz Zarraga <ekaitz@elenq.tech>
Subject: RISC-V backport to 4.6.4 - Questions about libgcc
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Hi all,

I'm backporting RISC-V support to GCC 4.6.4 in order to obtain a bootstrapp=
able GCC for RISC-V and I'm finding some issues I can't solve myself. Maybe=
 you can help.

I managed to backport the core of gcc, so now I can compile to assembly.

The problems came with the backport of `libgcc` because I don't understand =
the building process very well (and it also changed from gcc 4.6.4 to 7.5).=
 I managed to make it build by copying many parts of the build system from =
`libgcc/config/riscv` to `gcc/config/riscv` because I was obtaining errors =
like: "Extra parts are not coherent". At the moment I managed it to compile=
 but when I try to build software with it it's unable to find some of the f=
unctions that should be available in libgcc:

```
printf_fphex.c:212: undefined reference to `__unordtf2'
printf_fphex.c:212: undefined reference to `__letf2'
```

Can anyone point me to what I might be missing here? I'm out of ideas.

If anyone is interested on taking a deeper look, the repository with my cha=
nges can be found here:
https://github.com/ekaitz-zarraga/gcc

Thank you very much,
Ekaitz