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-rw-r--r--absl/base/config.h8
-rw-r--r--absl/base/internal/endian.h2
-rw-r--r--absl/base/internal/raw_logging.cc5
-rw-r--r--absl/base/internal/sysinfo.cc2
-rw-r--r--absl/debugging/internal/stacktrace_config.h4
-rw-r--r--absl/debugging/internal/stacktrace_powerpc-inl.inc3
6 files changed, 15 insertions, 9 deletions
diff --git a/absl/base/config.h b/absl/base/config.h
index 6aeceb9b0616..fc48be0b8fc1 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -254,8 +254,9 @@
 // POSIX.1-2001.
 #ifdef ABSL_HAVE_MMAP
 #error ABSL_HAVE_MMAP cannot be directly set
-#elif defined(__linux__) || defined(__APPLE__) || defined(__ros__) || \
-    defined(__native_client__) || defined(__asmjs__) || defined(__Fuchsia__)
+#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
+    defined(__ros__) || defined(__native_client__) || defined(__asmjs__) || \
+    defined(__Fuchsia__)
 #define ABSL_HAVE_MMAP 1
 #endif
 
@@ -265,7 +266,8 @@
 // functions as defined in POSIX.1-2001.
 #ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
 #error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
-#elif defined(__linux__) || defined(__APPLE__) || defined(__ros__)
+#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
+    defined(__ros__)
 #define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
 #endif
 
diff --git a/absl/base/internal/endian.h b/absl/base/internal/endian.h
index 602129eed207..edc10f10a5aa 100644
--- a/absl/base/internal/endian.h
+++ b/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
diff --git a/absl/base/internal/raw_logging.cc b/absl/base/internal/raw_logging.cc
index 1b849abfceae..301b108c07e9 100644
--- a/absl/base/internal/raw_logging.cc
+++ b/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
diff --git a/absl/base/internal/sysinfo.cc b/absl/base/internal/sysinfo.cc
index 00e98b662cc6..884c31262877 100644
--- a/absl/base/internal/sysinfo.cc
+++ b/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
 
diff --git a/absl/debugging/internal/stacktrace_config.h b/absl/debugging/internal/stacktrace_config.h
index 57f0b0f2a6e2..9bd2a2ab9e72 100644
--- a/absl/debugging/internal/stacktrace_config.h
+++ b/absl/debugging/internal/stacktrace_config.h
@@ -25,8 +25,8 @@
 #if ABSL_STACKTRACE_INL_HEADER
 #error ABSL_STACKTRACE_INL_HEADER cannot be directly set
 #elif defined(__native_client__) || defined(__APPLE__) || \
-    defined(__ANDROID__) || defined(__myriad2__) || defined(asmjs__) || \
-    defined(__Fuchsia__)
+    defined(__FreeBSD__) || defined(__ANDROID__) || defined(__myriad2__) || \
+    defined(asmjs__) || defined(__Fuchsia__)
 #define ABSL_STACKTRACE_INL_HEADER \
     "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
 
diff --git a/absl/debugging/internal/stacktrace_powerpc-inl.inc b/absl/debugging/internal/stacktrace_powerpc-inl.inc
index 0628b285f6c1..60a889a9253b 100644
--- a/absl/debugging/internal/stacktrace_powerpc-inl.inc
+++ b/absl/debugging/internal/stacktrace_powerpc-inl.inc
@@ -47,7 +47,8 @@ static inline void *StacktracePowerPCGetLR(void **sp) {
   return *(sp+2);
 #elif defined(_CALL_SYSV)
   return *(sp+1);
-#elif defined(__APPLE__) || (defined(__linux__) && defined(__PPC64__))
+#elif defined(__APPLE__) || defined(__FreeBSD__) || \
+  (defined(__linux__) && defined(__PPC64__))
   // This check is in case the compiler doesn't define _CALL_AIX/etc.
   return *(sp+2);
 #elif defined(__linux)