FreeBSD compability (#57)

absl/base/internal/endian.h

@@ -22,6 +22,8 @@
 #elif defined(__APPLE__)
 // Mac OS X / Darwin features
 #include <libkern/OSByteOrder.h>
+#elif defined(__FreeBSD__)
+#include <sys/endian.h>
 #elif defined(__GLIBC__)
 #include <byteswap.h>  // IWYU pragma: export
 #endif

absl/base/internal/raw_logging.cc

@@ -34,7 +34,8 @@
 //
 // This preprocessor token is also defined in raw_io.cc.  If you need to copy
 // this, consider moving both to config.h instead.
-#if defined(__linux__) || defined(__APPLE__) || defined(__Fuchsia__)
+#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
+    defined(__Fuchsia__)
 #include <unistd.h>
 
 
@@ -47,7 +48,7 @@
 // ABSL_HAVE_SYSCALL_WRITE is defined when the platform provides the syscall
 //   syscall(SYS_write, /*int*/ fd, /*char* */ buf, /*size_t*/ len);
 // for low level operations that want to avoid libc.
-#if defined(__linux__) && !defined(__ANDROID__)
+#if (defined(__linux__) || defined(__FreeBSD__)) && !defined(__ANDROID__)
 #include <sys/syscall.h>
 #define ABSL_HAVE_SYSCALL_WRITE 1
 #define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1

absl/base/internal/sysinfo.cc

@@ -29,7 +29,7 @@
 #include <sys/syscall.h>
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__FreeBSD__)
 #include <sys/sysctl.h>
 #endif