diff --git a/compiler-rt/lib/interception/interception_linux.h b/compiler-rt/lib/interception/interception_linux.h
--- a/compiler-rt/lib/interception/interception_linux.h
+++ b/compiler-rt/lib/interception/interception_linux.h
@@ -21,6 +21,15 @@
 #ifndef INTERCEPTION_LINUX_H
 #define INTERCEPTION_LINUX_H
 
+// lib/tsan passes --sysroot=. so features.h may be unavailable.
+// Define __GLIBC__ if SANITIZER_LINUX_GNU is set.
+#if __has_include(<features.h>)
+#include <features.h>
+#endif
+#if !defined(__GLIBC__) && SANITIZER_LINUX_GNU
+#define __GLIBC__ 2
+#endif
+
 namespace __interception {
 bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
                        uptr wrapper);
@@ -35,8 +44,8 @@
       (::__interception::uptr) & (func),          \
       (::__interception::uptr) & WRAP(func))
 
-// Android and Solaris do not have dlvsym
-#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS
+// dlvsym is a GNU extension supported by some other platforms.
+#if defined(__GLIBC__) || SANITIZER_FREEBSD
 #define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
   ::__interception::InterceptFunction(                        \
       #func, symver,                                          \
diff --git a/compiler-rt/lib/interception/interception_linux.cpp b/compiler-rt/lib/interception/interception_linux.cpp
--- a/compiler-rt/lib/interception/interception_linux.cpp
+++ b/compiler-rt/lib/interception/interception_linux.cpp
@@ -63,8 +63,8 @@
   return addr && (func == wrapper);
 }
 
-// Android and Solaris do not have dlvsym
-#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS
+// dlvsym is a GNU extension supported by some other platforms.
+#if defined(__GLIBC__) || SANITIZER_FREEBSD
 static void *GetFuncAddr(const char *name, const char *ver) {
   return dlvsym(RTLD_NEXT, name, ver);
 }
@@ -75,7 +75,7 @@
   *ptr_to_real = (uptr)addr;
   return addr && (func == wrapper);
 }
-#endif  // !SANITIZER_ANDROID
+#endif  // defined(__GLIBC__) || SANITIZER_FREEBSD
 
 }  // namespace __interception
 
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -46,6 +46,12 @@
 #define SI_LINUX_NOT_ANDROID 0
 #endif
 
+#ifdef __GLIBC__
+#define SI_GLIBC 1
+#else
+#define SI_GLIBC 0
+#endif
+
 #if SANITIZER_ANDROID
 #define SI_ANDROID 1
 #else
@@ -234,8 +240,8 @@
 #define SANITIZER_INTERCEPT_CLOCK_GETCPUCLOCKID SI_LINUX
 #define SANITIZER_INTERCEPT_GETITIMER SI_POSIX
 #define SANITIZER_INTERCEPT_TIME SI_POSIX
-#define SANITIZER_INTERCEPT_GLOB SI_LINUX_NOT_ANDROID || SI_SOLARIS
-#define SANITIZER_INTERCEPT_GLOB64 SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_GLOB (SI_GLIBC || SI_SOLARIS)
+#define SANITIZER_INTERCEPT_GLOB64 SI_GLIBC
 #define SANITIZER_INTERCEPT_WAIT SI_POSIX
 #define SANITIZER_INTERCEPT_INET SI_POSIX
 #define SANITIZER_INTERCEPT_PTHREAD_GETSCHEDPARAM SI_POSIX
@@ -263,7 +269,7 @@
 #define SANITIZER_INTERCEPT_SENDMMSG SI_LINUX
 #define SANITIZER_INTERCEPT_SYSMSG SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_GETPEERNAME SI_POSIX
-#define SANITIZER_INTERCEPT_IOCTL SI_POSIX
+#define SANITIZER_INTERCEPT_IOCTL (SI_POSIX && (!SI_LINUX_NOT_ANDROID || SI_GLIBC))
 #define SANITIZER_INTERCEPT_INET_ATON SI_POSIX
 #define SANITIZER_INTERCEPT_SYSINFO SI_LINUX
 #define SANITIZER_INTERCEPT_READDIR SI_POSIX
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
@@ -37,6 +37,7 @@
 #include <pwd.h>
 #include <signal.h>
 #include <stddef.h>
+#include <stdio.h>
 #include <sys/mman.h>
 #include <sys/resource.h>
 #include <sys/socket.h>
@@ -58,7 +59,6 @@
 #endif
 
 #if !SANITIZER_ANDROID
-#include <fstab.h>
 #include <sys/mount.h>
 #include <sys/timeb.h>
 #include <utmpx.h>
@@ -110,10 +110,10 @@
 #include <wordexp.h>
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
-#include <glob.h>
+#if SANITIZER_LINUX
+#ifdef __GLIBC__
+#include <fstab.h>
 #include <obstack.h>
-#include <mqueue.h>
 #include <net/if_ppp.h>
 #include <netax25/ax25.h>
 #include <netipx/ipx.h>
@@ -122,6 +122,17 @@
 # include <rpc/xdr.h>
 #endif
 #include <scsi/scsi.h>
+#else
+#include <linux/kd.h>
+#include <linux/ppp_defs.h>
+#include <linux/if_ppp.h>
+#endif  // __GLIBC__
+
+#if SANITIZER_ANDROID
+#include <linux/mtio.h>
+#else
+#include <glob.h>
+#include <mqueue.h>
 #include <sys/mtio.h>
 #include <sys/kd.h>
 #include <sys/shm.h>
@@ -142,16 +153,8 @@
 #include <sys/msg.h>
 #include <sys/ipc.h>
 #include <crypt.h>
-#endif // SANITIZER_LINUX && !SANITIZER_ANDROID
+#endif  // SANITIZER_ANDROID
 
-#if SANITIZER_ANDROID
-#include <linux/kd.h>
-#include <linux/mtio.h>
-#include <linux/ppp_defs.h>
-#include <linux/if_ppp.h>
-#endif
-
-#if SANITIZER_LINUX
 #include <link.h>
 #include <sys/vfs.h>
 #include <sys/epoll.h>
@@ -202,8 +205,10 @@
   unsigned struct_statfs64_sz = sizeof(struct statfs64);
 #endif // (SANITIZER_MAC && !TARGET_CPU_ARM64) && !SANITIZER_IOS
 
-#if !SANITIZER_ANDROID
+#ifdef __GLIBC__
   unsigned struct_fstab_sz = sizeof(struct fstab);
+#endif  // __GLIBC__
+#if !SANITIZER_ANDROID
   unsigned struct_statfs_sz = sizeof(struct statfs);
   unsigned struct_sockaddr_sz = sizeof(struct sockaddr);
   unsigned ucontext_t_sz = sizeof(ucontext_t);
@@ -262,7 +267,6 @@
   int e_tabsz = (int)E_TABSZ;
 #endif
 
-
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
   unsigned struct_shminfo_sz = sizeof(struct shminfo);
   unsigned struct_shm_info_sz = sizeof(struct shm_info);
@@ -299,9 +303,9 @@
 unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
-  int glob_nomatch = GLOB_NOMATCH;
-  int glob_altdirfunc = GLOB_ALTDIRFUNC;
+#ifdef __GLIBC__
+int glob_nomatch = GLOB_NOMATCH;
+int glob_altdirfunc = GLOB_ALTDIRFUNC;
 #endif
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID &&                               \
@@ -422,7 +426,9 @@
   unsigned struct_input_id_sz = sizeof(struct input_id);
   unsigned struct_mtpos_sz = sizeof(struct mtpos);
   unsigned struct_rtentry_sz = sizeof(struct rtentry);
+#if defined(__GLIBC__) || SANITIZER_ANDROID
   unsigned struct_termio_sz = sizeof(struct termio);
+#endif
   unsigned struct_vt_consize_sz = sizeof(struct vt_consize);
   unsigned struct_vt_sizes_sz = sizeof(struct vt_sizes);
   unsigned struct_vt_stat_sz = sizeof(struct vt_stat);
@@ -447,7 +453,7 @@
   unsigned struct_vt_mode_sz = sizeof(struct vt_mode);
 #endif // SANITIZER_LINUX
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#ifdef __GLIBC__
   unsigned struct_ax25_parms_struct_sz = sizeof(struct ax25_parms_struct);
   unsigned struct_cyclades_monitor_sz = sizeof(struct cyclades_monitor);
 #if EV_VERSION > (0x010000)
@@ -470,12 +476,10 @@
   unsigned struct_sockaddr_ax25_sz = sizeof(struct sockaddr_ax25);
   unsigned struct_unimapdesc_sz = sizeof(struct unimapdesc);
   unsigned struct_unimapinit_sz = sizeof(struct unimapinit);
-#endif // SANITIZER_LINUX && !SANITIZER_ANDROID
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
   unsigned struct_audio_buf_info_sz = sizeof(struct audio_buf_info);
   unsigned struct_ppp_stats_sz = sizeof(struct ppp_stats);
-#endif // (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
+#endif  // __GLIBC__
 
 #if !SANITIZER_ANDROID && !SANITIZER_MAC
   unsigned struct_sioc_sg_req_sz = sizeof(struct sioc_sg_req);
@@ -881,6 +885,7 @@
   unsigned IOCTL_PIO_UNIMAP = PIO_UNIMAP;
   unsigned IOCTL_PIO_UNIMAPCLR = PIO_UNIMAPCLR;
   unsigned IOCTL_PIO_UNISCRNMAP = PIO_UNISCRNMAP;
+#ifdef __GLIBC__
   unsigned IOCTL_SCSI_IOCTL_GET_IDLUN = SCSI_IOCTL_GET_IDLUN;
   unsigned IOCTL_SCSI_IOCTL_PROBE_HOST = SCSI_IOCTL_PROBE_HOST;
   unsigned IOCTL_SCSI_IOCTL_TAGGED_DISABLE = SCSI_IOCTL_TAGGED_DISABLE;
@@ -899,6 +904,7 @@
   unsigned IOCTL_SIOCNRGETPARMS = SIOCNRGETPARMS;
   unsigned IOCTL_SIOCNRRTCTL = SIOCNRRTCTL;
   unsigned IOCTL_SIOCNRSETPARMS = SIOCNRSETPARMS;
+#endif
   unsigned IOCTL_TIOCGSERIAL = TIOCGSERIAL;
   unsigned IOCTL_TIOCSERGETMULTI = TIOCSERGETMULTI;
   unsigned IOCTL_TIOCSERSETMULTI = TIOCSERSETMULTI;
@@ -969,7 +975,7 @@
 CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_phnum);
 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
 
-#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
+#if defined(__GLIBC__) || SANITIZER_FREEBSD
 CHECK_TYPE_SIZE(glob_t);
 CHECK_SIZE_AND_OFFSET(glob_t, gl_pathc);
 CHECK_SIZE_AND_OFFSET(glob_t, gl_pathv);
@@ -980,7 +986,7 @@
 CHECK_SIZE_AND_OFFSET(glob_t, gl_opendir);
 CHECK_SIZE_AND_OFFSET(glob_t, gl_lstat);
 CHECK_SIZE_AND_OFFSET(glob_t, gl_stat);
-#endif
+#endif  // defined(__GLIBC__) || SANITIZER_FREEBSD
 
 CHECK_TYPE_SIZE(addrinfo);
 CHECK_SIZE_AND_OFFSET(addrinfo, ai_flags);
@@ -1003,6 +1009,7 @@
 CHECK_SIZE_AND_OFFSET(iovec, iov_base);
 CHECK_SIZE_AND_OFFSET(iovec, iov_len);
 
+#if defined(__GLIBC__) || SANITIZER_ANDROID
 CHECK_TYPE_SIZE(msghdr);
 CHECK_SIZE_AND_OFFSET(msghdr, msg_name);
 CHECK_SIZE_AND_OFFSET(msghdr, msg_namelen);
@@ -1016,6 +1023,7 @@
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_len);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_level);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_type);
+#endif
 
 #if SANITIZER_LINUX && (__ANDROID_API__ >= 21 || __GLIBC_PREREQ (2, 14))
 CHECK_TYPE_SIZE(mmsghdr);
@@ -1121,7 +1129,7 @@
 
 CHECK_TYPE_SIZE(ether_addr);
 
-#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
+#if defined(__GLIBC__) || SANITIZER_FREEBSD
 CHECK_TYPE_SIZE(ipc_perm);
 # if SANITIZER_FREEBSD
 CHECK_SIZE_AND_OFFSET(ipc_perm, key);
@@ -1183,7 +1191,7 @@
 CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_data);
 #endif
 
-#if SANITIZER_LINUX
+#if defined(__GLIBC__) || SANITIZER_ANDROID
 COMPILER_CHECK(sizeof(__sanitizer_struct_mallinfo) == sizeof(struct mallinfo));
 #endif
 
@@ -1233,7 +1241,7 @@
 COMPILER_CHECK(__sanitizer_XDR_FREE == XDR_FREE);
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#ifdef __GLIBC__
 COMPILER_CHECK(sizeof(__sanitizer_FILE) <= sizeof(FILE));
 CHECK_SIZE_AND_OFFSET(FILE, _flags);
 CHECK_SIZE_AND_OFFSET(FILE, _IO_read_ptr);
@@ -1250,9 +1258,7 @@
 CHECK_SIZE_AND_OFFSET(FILE, _markers);
 CHECK_SIZE_AND_OFFSET(FILE, _chain);
 CHECK_SIZE_AND_OFFSET(FILE, _fileno);
-#endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
 COMPILER_CHECK(sizeof(__sanitizer__obstack_chunk) <= sizeof(_obstack_chunk));
 CHECK_SIZE_AND_OFFSET(_obstack_chunk, limit);
 CHECK_SIZE_AND_OFFSET(_obstack_chunk, prev);
@@ -1267,7 +1273,7 @@
 CHECK_SIZE_AND_OFFSET(cookie_io_functions_t, write);
 CHECK_SIZE_AND_OFFSET(cookie_io_functions_t, seek);
 CHECK_SIZE_AND_OFFSET(cookie_io_functions_t, close);
-#endif
+#endif  // __GLIBC__
 
 #if SANITIZER_LINUX || SANITIZER_FREEBSD
 CHECK_TYPE_SIZE(sem_t);
diff --git a/compiler-rt/lib/tsan/CMakeLists.txt b/compiler-rt/lib/tsan/CMakeLists.txt
--- a/compiler-rt/lib/tsan/CMakeLists.txt
+++ b/compiler-rt/lib/tsan/CMakeLists.txt
@@ -251,6 +251,12 @@
   list(REMOVE_ITEM _tsan_generic_sources ${_tsan_platform_sources})
   set_source_files_properties(${_tsan_generic_sources}
     PROPERTIES COMPILE_FLAGS "--sysroot=.")
+  # Unfortunately --sysroot=. makes /usr/include/features.h unavailable.
+  # Pass -DSANITIZER_LINUX_GNU=1 to indicate glibc.
+  if(COMPILER_RT_DEFAULT_TARGET_TRIPLE MATCHES ".*linux-gnu.*")
+    set_source_files_properties(${_tsan_generic_sources}
+      PROPERTIES COMPILE_FLAGS "-DSANITIZER_LINUX_GNU=1")
+  endif()
 endif()
 
 # Build libcxx instrumented with TSan.