[Bug 261412] [exp-run] With llvm-unwind headers placed in /usr/include

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261412

--- Comment #2 from Ed Maste <emaste@freebsd.org> ---
google-perftools:

ld: error: ./.libs/libtcmalloc_debug.so: undefined reference to unw_getcontext
[--no-allow-shlib-undefined]
ld: error: ./.libs/libtcmalloc_debug.so: undefined reference to unw_init_local
[--no-allow-shlib-undefined]
ld: error: ./.libs/libtcmalloc_debug.so: undefined reference to unw_step
[--no-allow-shlib-undefined]
ld: error: ./.libs/libtcmalloc_debug.so: undefined reference to unw_get_reg
[--no-allow-shlib-undefined]
c++: error: linker command failed with exit code 1 (use -v to see invocation)

presumably just exposed by HAVE_LIBUNWIND_H being true now



ltrace:

execute_program.c:4:10: fatal error: 'libunwind-ptrace.h' file not found
#include <libunwind-ptrace.h>
         ^~~~~~~~~~~~~~~~~~~~
1 error generated.

which comes from:

#if defined(HAVE_LIBUNWIND)
#include <libunwind-ptrace.h>
#endif /* defined(HAVE_LIBUNWIND) */

Interestingly they have a check for libunwind-ptrace.h specifically:

/* Define to 1 if you have the <libunwind-ptrace.h> header file. */
#undef HAVE_LIBUNWIND_PTRACE_H

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