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digitalmars.D.learn - Druntime undefined references

reply Severin Teona <teona.severin9 gmail.com> writes:
Hi guys!

I build the druntime for an ARM Cortex-M based microcontroller 
and I trying to create an application and link it with the 
druntime. I am also using TockOS[1], which does not implement 
POSIX thread calls and other OS-dependent implementations. As I 
was looking through the errors I got, I found some functions and 
I don’t know what they do, or how should I solve the errors.

The first one is:
libdruntime-ldc.a(dwarfeh.o): in function 
`_d_eh_personality_common': 
dwarfeh.d:(.text._d_eh_personality_common[_d_eh_personality_common]+0x2c):
undefined reference to `_d_eh_GetIPInfo'

and the second one is:
dl.d:(.text._D4core8internal3elf2dl12SharedObject14thisExecutableFNbNiZSQCgQCeQByQBxQBx[_D4core8internal3elf2dl12SharedObject14thisExecutableFNbNiZSQCg
CeQByQBxQBx]+0x1a): undefined reference to `dl_iterate_phdr'
(the druntime was build as a static library, because I can’t use 
dynamic libraries on a microcontroller)

Does anyone know what these exactly do and how 
important/essential are they? Is there any way I could solve them?

Thank a lot.

[1]: https://www.tockos.org
Nov 02 2020
next sibling parent drug <drug2004 bk.ru> writes:
On 11/2/20 1:50 PM, Severin Teona wrote:

 Hi guys!
 
 I build the druntime for an ARM Cortex-M based microcontroller and I 
 trying to create an application and link it with the druntime. I am also 
 using TockOS[1], which does not implement POSIX thread calls and other 
 OS-dependent implementations. As I was looking through the errors I got, 
 I found some functions and I don’t know what they do, or how should I 
 solve the errors.
 
 The first one is:
 libdruntime-ldc.a(dwarfeh.o): in function `_d_eh_personality_common': 
 dwarfeh.d:(.text._d_eh_personality_common[_d_eh_personality_common]+0x2c): 
 undefined reference to `_d_eh_GetIPInfo'
 
 and the second one is:
 dl.d:(.text._D4core8internal3elf2dl12SharedObject14thisExecutableFNbNiZSQCgQCeQByQBxQBx[_D4core8internal3elf2dl12SharedObject14thisExecutableFNbNiZSQCg
CeQByQBxQBx]+0x1a): 
 undefined reference to `dl_iterate_phdr'
 (the druntime was build as a static library, because I can’t use dynamic 
 libraries on a microcontroller)
 
 Does anyone know what these exactly do and how important/essential are 
 they? Is there any way I could solve them?
 
 Thank a lot.
 
 [1]: https://www.tockos.org
 


cant' help much but just in case - see 
https://github.com/ldc-developers/ldc/pull/2405#issuecomment-346187456, 
may be it helps

also you can define this symbol yourself with assert(0) to check if it 
is called at all

what about  - quick glance at 
https://linux.die.net/man/3/dl_iterate_phdr says us that this symbol is 
used only with shared objects so you can try to define it yourself with 
assert(0) like this (not tested!!!):
```D
extern(C):
alias Callback = int function (void*, size_t, void*);
int dl_iterate_phdr(Callback callback, void* data)
{
	assert(0);
}
```
this lets you to link druntime at least and if those symbols were called 
abort the execution
Nov 02 2020
prev sibling parent IGotD- <nise nise.com> writes:
On Monday, 2 November 2020 at 10:50:06 UTC, Severin Teona wrote:

 Hi guys!

 I build the druntime for an ARM Cortex-M based microcontroller 
 and I trying to create an application and link it with the 
 druntime. I am also using TockOS[1], which does not implement 
 POSIX thread calls and other OS-dependent implementations. As I 
 was looking through the errors I got, I found some functions 
 and I don’t know what they do, or how should I solve the errors.

 The first one is:
 libdruntime-ldc.a(dwarfeh.o): in function 
 `_d_eh_personality_common': 
 dwarfeh.d:(.text._d_eh_personality_common[_d_eh_personality_common]+0x2c):
undefined reference to `_d_eh_GetIPInfo'

 and the second one is:
 dl.d:(.text._D4core8internal3elf2dl12SharedObject14thisExecutableFNbNiZSQCgQCeQByQBxQBx[_D4core8internal3elf2dl12SharedObject14thisExecutableFNbNiZSQCg
CeQByQBxQBx]+0x1a): undefined reference to `dl_iterate_phdr'
 (the druntime was build as a static library, because I can’t 
 use dynamic libraries on a microcontroller)

 Does anyone know what these exactly do and how 
 important/essential are they? Is there any way I could solve 
 them?

 Thank a lot.

 [1]: https://www.tockos.org


https://man7.org/linux/man-pages/man3/dl_iterate_phdr.3.html

dl_iterate_phdr is used to iterate over the elf program headers 
and is used to get a textual back trace among other things. These 
are typically calls found in Linux systems and if you don't have 
that, you have to replace them with your own calls or just remove 
the call all together.

Much of the elf stuff can be removed. The only things that might 
be essential is that druntime needs to know where the TLS data is 
per thread for scanning.
Nov 02 2020