Use FreeBSD macro definition for ElfW macro for compatibility. (#1037)

absl/debugging/internal/elf_mem_image.h

@@ -40,6 +40,10 @@
 
 #include <link.h>  // for ElfW
 
+#if defined(__FreeBSD__) && !defined(ElfW)
+#define ElfW(x) __ElfN(x)
+#endif
+
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace debugging_internal {

absl/debugging/internal/vdso_support.cc

@@ -50,6 +50,11 @@
 #define AT_SYSINFO_EHDR 33  // for crosstoolv10
 #endif
 
+#if defined(__FreeBSD__)
+using Elf64_auxv_t = Elf64_Auxinfo;
+using Elf32_auxv_t = Elf32_Auxinfo;
+#endif
+
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace debugging_internal {

absl/debugging/symbolize_elf.inc

@@ -77,6 +77,10 @@
 #include "absl/debugging/internal/vdso_support.h"
 #include "absl/strings/string_view.h"
 
+#if defined(__FreeBSD__) && !defined(ElfW)
+#define ElfW(x) __ElfN(x)
+#endif
+
 namespace absl {
 ABSL_NAMESPACE_BEGIN