Hi,
I've noticed that recently some ports are dumping core during builds of
dependencies in head in poudriere.
I'm seeing this for example with sassc crashing while trying to build
x11-themes/greybird-theme.
My first suspect was the llvm upgrade in head, but forcing sassc and
libsass to build with older clang via USES=llvm:max=18 is not helping.
I did recompile the offending programs with debug and tried a backtrace
and got this:
```
(lldb) bt
* thread #1, name = 'sassc', stop reason = signal SIGSEGV: invalid
permissions for mapped object (fault address: 0x82374a000)
* frame #0: 0x000000082374a000 libsass.so.1
frame #1: 0x0000000823865a86 libsass.so.1`_GLOBAL__sub_I_ast.cpp
[inlined] double std::__1::__math::acos[abi:se190102]<int, 0>(__x=-1) at
inverse_trigonometric_functions.h:40:10
frame #2: 0x0000000823865a81 libsass.so.1`_GLOBAL__sub_I_ast.cpp
[inlined] __cxx_global_var_init at units.hpp:11:21
frame #3: 0x0000000823865a81 libsass.so.1`_GLOBAL__sub_I_ast.cpp at
ast.cpp:0
frame #4: 0x00001eac6e3f078d ld-elf.so.1
frame #5: 0x00001eac6e3ef349 ld-elf.so.1
frame #6: 0x00001eac6e3ec099 ld-elf.so.1`___lldb_unnamed_symbol27 + 25
```
which points me to this upstream line of code:
https://github.com/sass/libsass/blob/7037f03fabeb2b18b5efa84403f5a6d7a990f460/src/units.hpp#L11
I could change the way it derives PI, but I'm not sure this is the
correct fix.
Thanks in advance for any insight!
--
Guido Falsi <m...@madpilot.net>
