Add NetBSD support (#1121)

absl/base/config.h

@@ -414,7 +414,7 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
     defined(_AIX) || defined(__ros__) || defined(__native_client__) ||    \
     defined(__asmjs__) || defined(__wasm__) || defined(__Fuchsia__) ||    \
     defined(__sun) || defined(__ASYLO__) || defined(__myriad2__) ||       \
-    defined(__HAIKU__) || defined(__OpenBSD__)
+    defined(__HAIKU__) || defined(__OpenBSD__) || defined(__NetBSD__)
 #define ABSL_HAVE_MMAP 1
 #endif
 
@@ -425,7 +425,8 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 #ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
 #error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
-    defined(_AIX) || defined(__ros__) || defined(__OpenBSD__)
+    defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) || \
+    defined(__NetBSD__)
 #define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
 #endif
 

absl/debugging/internal/elf_mem_image.cc

@@ -351,7 +351,11 @@ void ElfMemImage::SymbolIterator::Update(int increment) {
   const ElfW(Versym) *version_symbol = image->GetVersym(index_);
   ABSL_RAW_CHECK(symbol && version_symbol, "");
   const char *const symbol_name = image->GetDynstr(symbol->st_name);
+#if defined(__NetBSD__)
+  const int version_index = version_symbol->vs_vers & VERSYM_VERSION;
+#else
   const ElfW(Versym) version_index = version_symbol[0] & VERSYM_VERSION;
+#endif
   const ElfW(Verdef) *version_definition = nullptr;
   const char *version_name = "";
   if (symbol->st_shndx == SHN_UNDEF) {

absl/debugging/internal/vdso_support.cc

@@ -50,6 +50,10 @@
 #define AT_SYSINFO_EHDR 33  // for crosstoolv10
 #endif
 
+#if defined(__NetBSD__)
+using Elf32_auxv_t = Aux32Info;
+using Elf64_auxv_t = Aux64Info;
+#endif
 #if defined(__FreeBSD__)
 #if defined(__ELF_WORD_SIZE) && __ELF_WORD_SIZE == 64
 using Elf64_auxv_t = Elf64_Auxinfo;
@@ -106,8 +110,13 @@ const void *VDSOSupport::Init() {
     ElfW(auxv_t) aux;
     while (read(fd, &aux, sizeof(aux)) == sizeof(aux)) {
       if (aux.a_type == AT_SYSINFO_EHDR) {
+#if defined(__NetBSD__)
+        vdso_base_.store(reinterpret_cast<void *>(aux.a_v),
+                         std::memory_order_relaxed);
+#else
         vdso_base_.store(reinterpret_cast<void *>(aux.a_un.a_val),
                          std::memory_order_relaxed);
+#endif
         break;
       }
     }