DescriptionNickolai Belakovski
2026-02-06 01:48:56 UTC
Description of problem:
Apologies that this is against llvm-toolset, but I tried to find the right component via the interface and couldn't, so this seemed like the closest one. The actual component is gcc-toolset-14 (and gcc-toolset-15).
Below is a sample Fortran program that uses nested functions (which require trampolines):
```
module algorithm
public :: algorithm_with_nested_function
abstract interface
subroutine OBJ()
end subroutine OBJ
end interface
contains
subroutine algorithm_with_nested_function()
call nested_function()
call evaluate(nested_function)
contains
subroutine nested_function()
print *, "nested function"
end subroutine nested_function
end subroutine algorithm_with_nested_function
subroutine evaluate(a_nested_function)
procedure(OBJ) :: a_nested_function
call a_nested_function()
end subroutine evaluate
end module algorithm
program hello
use algorithm, only : algorithm_with_nested_function
call algorithm_with_nested_function()
print *, "DONE"
end program hello
```
Running `gfortran -ftrampoline-impl=heap file.f90` leads to the following error (note that this compiler option is new as of gfortran v14):
```
/opt/rh/gcc-toolset-14/root/usr/libexec/gcc/aarch64-redhat-linux/14/ld: /tmp/ccJ5xEMc.o: in function `__algorithm_MOD_algorithm_with_nested_function':
main.f90:(.text+0xb0): undefined reference to `__gcc_nested_func_ptr_created'
/opt/rh/gcc-toolset-14/root/usr/libexec/gcc/aarch64-redhat-linux/14/ld: main.f90:(.text+0xc8): undefined reference to `__gcc_nested_func_ptr_deleted'
```
Adding `-lgcc_eh` at the end makes the error go away and the program compiles and runs fine. It seems to me that the user shouldn't have to add -lgcc_eh at the end, the toolchain should figure this out, no?
Version-Release number of selected component (if applicable):
How reproducible:
Very
Steps to Reproduce:
1. Run redhat/ubi9 docker image
2. Create the above file as file.f90
3. dnf install -y gcc-toolset-14
4. scl enable gcc-toolset-14 bash
5. gfortran -ftrampoline-impl=heap file.f90
6. Observe the error
7. gfortran -ftrampoline-impl=heap file.f90 -lgcc_eh
8. Observe that it works
Actual results:
Expected results:
Additional info:
If this isn't the right place to report this please let me know and I'll try to find the right place to report it.
Reassigning this to gcc (which contains gfortran) in case this is also relevant on Fedora, but if the issue is RHEL specific the right venue would be issues.redhat.com.
Fedora is not affected, those symbols are in libgcc_s.so.1 since GCC 14.
Guess DTS needs to (if we want to support this there at all) provide the symbol in libgcc_s_nonshared.a or something similar, or include it in libgcc.a in addition to libgcc_eh.a for RHEL versions which don't support those symbols in libgcc_s.so.1.
But bet for GTS this needs to be filed in JIRA rather than bugzilla.
Comment 3Siddhesh Poyarekar
2026-02-09 13:52:20 UTC
Not a bug in Fedora. If you're a Red Hat customer, please file a support case so that this gets prioritized appropriately:
https://access.redhat.com/support/cases/
If you're seeing this on CentOS Stream, please file an issue here:
https://issues.redhat.com/
Thanks!
Description of problem: Apologies that this is against llvm-toolset, but I tried to find the right component via the interface and couldn't, so this seemed like the closest one. The actual component is gcc-toolset-14 (and gcc-toolset-15). Below is a sample Fortran program that uses nested functions (which require trampolines): ``` module algorithm public :: algorithm_with_nested_function abstract interface subroutine OBJ() end subroutine OBJ end interface contains subroutine algorithm_with_nested_function() call nested_function() call evaluate(nested_function) contains subroutine nested_function() print *, "nested function" end subroutine nested_function end subroutine algorithm_with_nested_function subroutine evaluate(a_nested_function) procedure(OBJ) :: a_nested_function call a_nested_function() end subroutine evaluate end module algorithm program hello use algorithm, only : algorithm_with_nested_function call algorithm_with_nested_function() print *, "DONE" end program hello ``` Running `gfortran -ftrampoline-impl=heap file.f90` leads to the following error (note that this compiler option is new as of gfortran v14): ``` /opt/rh/gcc-toolset-14/root/usr/libexec/gcc/aarch64-redhat-linux/14/ld: /tmp/ccJ5xEMc.o: in function `__algorithm_MOD_algorithm_with_nested_function': main.f90:(.text+0xb0): undefined reference to `__gcc_nested_func_ptr_created' /opt/rh/gcc-toolset-14/root/usr/libexec/gcc/aarch64-redhat-linux/14/ld: main.f90:(.text+0xc8): undefined reference to `__gcc_nested_func_ptr_deleted' ``` Adding `-lgcc_eh` at the end makes the error go away and the program compiles and runs fine. It seems to me that the user shouldn't have to add -lgcc_eh at the end, the toolchain should figure this out, no? Version-Release number of selected component (if applicable): How reproducible: Very Steps to Reproduce: 1. Run redhat/ubi9 docker image 2. Create the above file as file.f90 3. dnf install -y gcc-toolset-14 4. scl enable gcc-toolset-14 bash 5. gfortran -ftrampoline-impl=heap file.f90 6. Observe the error 7. gfortran -ftrampoline-impl=heap file.f90 -lgcc_eh 8. Observe that it works Actual results: Expected results: Additional info: If this isn't the right place to report this please let me know and I'll try to find the right place to report it.