Fix libunwind to build on FreeBSD

[compnerd]

LGTM with the minor change.

src/AddressSpace.hpp

391 ↗

(On Diff #24426)

I think this would be better as:

#if !defined(Elf_Half)
typedef ElfW(Half) Elf_Half;
#endif
#if !defined(Elf_Phdr)
typedef ElfW(Phdr) Elf_Phdr;
#endif

libunwind/trunk/src/AddressSpace.hpp

int found = dl_iterate_phdr(
 
         assert(cbdata);
         assert(cbdata->sects);
 
         if (cbdata->targetAddr < pinfo->dlpi_addr) {
           return false;
         }
 
-        for (ElfW(Half) i = 0; i < pinfo->dlpi_phnum; i++) {
-          const ElfW(Phdr) *phdr = &pinfo->dlpi_phdr[i];
+#if !defined(Elf_Half)
+        typedef ElfW(Half) Elf_Half;
+#endif
+#if !defined(Elf_Phdr)
+        typedef ElfW(Phdr) Elf_Phdr;
+#endif
+
+        for (Elf_Half i = 0; i < pinfo->dlpi_phnum; i++) {
+          const Elf_Phdr *phdr = &pinfo->dlpi_phdr[i];
           if (phdr->p_type == PT_LOAD) {
             uintptr_t begin = pinfo->dlpi_addr + phdr->p_vaddr;
             uintptr_t end = begin + phdr->p_memsz;
             if (cbdata->targetAddr >= begin && cbdata->targetAddr < end) {
               cbdata->sects->dso_base = begin;
               object_length = phdr->p_memsz;
               found_obj = true;
             }