[PATCH v4 03/10] RISC-V: Add path of library directories for the 32-bit

[DJ Delorie]

As much as I hate code duplication, I think we need separate macros for
64 and 32 bit targets, else the 32-bit linker will search 64-bit
libraries and the 64-bit linker will search 32-bit libraries.  While the
linker should be smart enough to skip incompatible libraries, it's
expensive to do so, and certainly "unexpected" from a developer's point
of view.

Zong Li <zongbox@gmail.com> writes:
> @@ -51,7 +53,14 @@
>        size_t len = strlen (dir);					\
>        char path[len + 9];						\
>        memcpy (path, dir, len + 1);					\
> -      if (len >= 12 && ! memcmp(path + len - 12, "/lib64/lp64d", 12))	\
> +      if (len >= 13 && ! memcmp(path + len - 13, "/lib32/ilp32d", 13))	\
> +        {								\
> +          len -= 9;							\
> +	  path[len] = '\0';						\
> +        }								\
> +      if (len >= 12							\
> +          && (! memcmp(path + len - 12, "/lib32/ilp32", 12)		\
> +              || ! memcmp(path + len - 12, "/lib64/lp64d", 12)))	\
>  	{								\
>  	  len -= 8;							\
>  	  path[len] = '\0';						\
> @@ -64,6 +73,10 @@
>        add_dir (path);							\
>        if (len >= 4 && ! memcmp(path + len - 4, "/lib", 4))		\
>  	{								\
> +	  memcpy (path + len, "32/ilp32d", 10);				\
> +	  add_dir (path);						\
> +	  memcpy (path + len, "32/ilp32", 9);				\
> +	  add_dir (path);						\
>  	  memcpy (path + len, "64/lp64d", 9);				\
>  	  add_dir (path);						\
>  	  memcpy (path + len, "64/lp64", 8);				\