Issue when compiling tlx against musl

[jeremiahpslewis]

Problematic line seems to be:

tlx/tlx/backtrace.cpp

Line 19 in 1b2059e

#if __linux__

tlx/tlx/backtrace.cpp

Line 22 in 1b2059e

#include <execinfo.h>

A fix might (have no C++ experience, apologies) be:

-#ifdef __linux__
 +#ifdef __GLIBC__

Seems like it might be a similar issue to one resolved in this project:

• Build fails looking for execinfo.h when building against musl PowerDNS/pdns#1956
• Change ifdef to check for __GLIBC__ instead of __linux__ to prevent errors when building under other libc's PowerDNS/pdns#1958

[22:23:18] Cloning into 'utfcpp'...
[22:23:18] /workspace/srcdir/qlever/third_party/stxxl/extlib/foxxll/extlib/tlx/tlx/backtrace.cpp:22:10: fatal error: execinfo.h: No such file or directory
[22:23:18]    22 | #include <execinfo.h>
[22:23:18]       |          ^~~~~~~~~~~~
[22:23:18] compilation terminated.
[22:23:18] make[2]: *** [third_party/stxxl/extlib/foxxll/extlib/tlx/tlx/CMakeFiles/tlx.dir/build.make:96: third_party/stxxl/extlib/foxxll/extlib/tlx/tlx/CMakeFiles/tlx.dir/backtrace.cpp.o] Error 1
[22:23:18] make[2]: *** Waiting for unfinished jobs....

See here: https://gist.github.com/jeremiahpslewis/d6db9f9848567ab992f196261f4eaf33

[bingmann]

This is now fixed in PR #44