Re: arm-none-eabi-toolchain: stdlib.h not found

[Ekaitz Zarraga]

ElenQ Technology


------- Original Message -------
On Tuesday, September 26th, 2023 at 22:28, Ekaitz Zarraga <ekaitz@elenq.tech> 
wrote:


> 
> ------- Original Message -------
> On Tuesday, September 5th, 2023 at 18:09, Ekaitz Zarraga ekaitz@elenq.tech 
> wrote:
> 
> 
> 
> > Hi,
> > 
> > If I guix shell to arm-none-eabi-toolchain:
> > 
> > `Ekaitz@tuxedo ~/projects/TESTS$ guix shell arm-none-eabi-toolchain`
> > 
> > arm-none-eabi-toolchain can't use cstdlib because:
> > 
> > ```
> > Ekaitz@tuxedo ~/projects/TESTS [env]$ cat a.c
> > #include <cstdlib>
> > 
> > void operator delete(void *p) { std::free(p); }
> > 
> > Ekaitz@tuxedo ~/projects/TESTS [env]$ arm-none-eabi-g++ a.c
> > In file included from a.c:1:0:
> > /gnu/store/6bq6svar4b2mkp2k3laxqqs1nsxykrvf-profile/arm-none-eabi/include/c++/cstdlib:75:15:
> >  fatal error: stdlib.h: No such file or directory
> > #include_next <stdlib.h>
> > 
> > ^~~~~~~~~~
> > compilation terminated.
> > Ekaitz@tuxedo ~/projects/TESTS [env]$
> > `But:`
> > Ekaitz@tuxedo ~/projects/TESTS [env]$ ls $CROSS_C_INCLUDE_PATH | grep stdlib
> > stdlib.h
> > ```
> > 
> > Ideas?
> 
> 
> 
> Hi,
> 
> I dug a little bit further and I found a very interesting behavior:
> 
> Preprocessor doesn't work vanilla:
> 
> ```
> Ekaitz@tuxedo ~/projects/rp2040/TESTS/RANDOM [env]$ arm-none-eabi-cpp a.c
> # 1 "a.c"
> # 1 "<built-in>"
> 
> # 1 "<command-line>"
> 
> # 1 "a.c"
> a.c:1:10: fatal error: cstdlib: No such file or directory
> #include <cstdlib>
> 
> ^~~~~~~~~
> compilation terminated.
> `We have CROSS_CPLUS_INCLUDE_PATH correctly set:`
> Ekaitz@tuxedo ~/projects/rp2040/TESTS/RANDOM [env]$ echo 
> $CROSS_CPLUS_INCLUDE_PATH
> /gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include:/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++:/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi
> `If we insert exactly the same directories pointed by 
> CROSS_CPLUS_INCLUDE_PATH manually to the preprocessor it works!`
> Ekaitz@tuxedo ~/projects/rp2040/TESTS/RANDOM [env]$ arm-none-eabi-cpp a.c 
> -I/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include 
> -I/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++
>  
> -I/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi
> # 1 "a.c"
> # 1 "<built-in>"
> 
> # 1 "<command-line>"
> 
> # 1 "a.c"
> # 1 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/cstdlib"
>  1
> # 39 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/cstdlib"
> 
> # 40 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/cstdlib"
>  3
> 
> # 1 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi/bits/c++config.h"
>  1 3
> # 533 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi/bits/c++config.h"
>  3
> # 1 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi/bits/os_defines.h"
>  1 3
> # 534 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi/bits/c++config.h"
>  2 3
> 
> 
> # 1 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi/bits/cpu_defines.h"
>  1 3
> # 537 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi/bits/c++config.h"
>  2 3
> # 42 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/cstdlib"
>  2 3
> # 75 
> "/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/cstdlib"
>  3
> ...
> ```
> 
> Anyone has an idea of what I'm missing here and why isn't it just automagic?
> 
> It should just work, or am I superwrong?
> 
> Thanks!


Oh! Too fast!

It was a different problem!

```
Ekaitz@tuxedo ~/projects/rp2040/TESTS/RANDOM [env]$ arm-none-eabi-g++  
-I/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include 
-I/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++ 
-I/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/arm-none-eabi
 a.c
In file included from a.c:1:0:
/gnu/store/6zcm3xq6d3a0j6pnjd09b3zj1c9qbmrl-profile/arm-none-eabi/include/c++/cstdlib:75:15:
 fatal error: stdlib.h: No such file or directory
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminated.
```

The problem is with C++ only.
With C, as per the previous email, I managed to pass the preprocessing step, 
but in C++ it doesn't!
It doesn't really matter if I play with the -I flag.
It just doesn't work :(