diff --git a/compiler-rt/lib/gwp_asan/crash_handler.cpp b/compiler-rt/lib/gwp_asan/crash_handler.cpp
--- a/compiler-rt/lib/gwp_asan/crash_handler.cpp
+++ b/compiler-rt/lib/gwp_asan/crash_handler.cpp
@@ -10,6 +10,7 @@
 #include "gwp_asan/stack_trace_compressor.h"
 
 #include <assert.h>
+#include <stdint.h>
 #include <string.h>
 
 using AllocationMetadata = gwp_asan::AllocationMetadata;
diff --git a/compiler-rt/lib/gwp_asan/guarded_pool_allocator.h b/compiler-rt/lib/gwp_asan/guarded_pool_allocator.h
--- a/compiler-rt/lib/gwp_asan/guarded_pool_allocator.h
+++ b/compiler-rt/lib/gwp_asan/guarded_pool_allocator.h
@@ -13,10 +13,9 @@
 #include "gwp_asan/definitions.h"
 #include "gwp_asan/mutex.h"
 #include "gwp_asan/options.h"
-#include "gwp_asan/platform_specific/guarded_pool_allocator_fuchsia.h"
-#include "gwp_asan/platform_specific/guarded_pool_allocator_posix.h"
+#include "gwp_asan/platform_specific/guarded_pool_allocator_fuchsia.h" // IWYU pragma: keep
+#include "gwp_asan/platform_specific/guarded_pool_allocator_posix.h" // IWYU pragma: keep
 #include "gwp_asan/platform_specific/guarded_pool_allocator_tls.h"
-#include "gwp_asan/stack_trace_compressor.h"
 
 #include <stddef.h>
 #include <stdint.h>
diff --git a/compiler-rt/lib/gwp_asan/guarded_pool_allocator.cpp b/compiler-rt/lib/gwp_asan/guarded_pool_allocator.cpp
--- a/compiler-rt/lib/gwp_asan/guarded_pool_allocator.cpp
+++ b/compiler-rt/lib/gwp_asan/guarded_pool_allocator.cpp
@@ -8,23 +8,10 @@
 
 #include "gwp_asan/guarded_pool_allocator.h"
 
-#include "gwp_asan/optional/segv_handler.h"
 #include "gwp_asan/options.h"
 #include "gwp_asan/utilities.h"
 
-// RHEL creates the PRIu64 format macro (for printing uint64_t's) only when this
-// macro is defined before including <inttypes.h>.
-#ifndef __STDC_FORMAT_MACROS
-#define __STDC_FORMAT_MACROS 1
-#endif
-
 #include <assert.h>
-#include <inttypes.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
 
 using AllocationMetadata = gwp_asan::AllocationMetadata;
 using Error = gwp_asan::Error;
diff --git a/compiler-rt/lib/gwp_asan/mutex.h b/compiler-rt/lib/gwp_asan/mutex.h
--- a/compiler-rt/lib/gwp_asan/mutex.h
+++ b/compiler-rt/lib/gwp_asan/mutex.h
@@ -9,8 +9,8 @@
 #ifndef GWP_ASAN_MUTEX_H_
 #define GWP_ASAN_MUTEX_H_
 
-#include "gwp_asan/platform_specific/mutex_fuchsia.h"
-#include "gwp_asan/platform_specific/mutex_posix.h"
+#include "gwp_asan/platform_specific/mutex_fuchsia.h" // IWYU pragma: keep
+#include "gwp_asan/platform_specific/mutex_posix.h"   // IWYU pragma: keep
 
 namespace gwp_asan {
 class Mutex final : PlatformMutex {
diff --git a/compiler-rt/lib/gwp_asan/platform_specific/common_posix.cpp b/compiler-rt/lib/gwp_asan/platform_specific/common_posix.cpp
--- a/compiler-rt/lib/gwp_asan/platform_specific/common_posix.cpp
+++ b/compiler-rt/lib/gwp_asan/platform_specific/common_posix.cpp
@@ -8,7 +8,9 @@
 
 #include "gwp_asan/common.h"
 
-#include <sys/syscall.h>
+#include <stdint.h>
+#include <sys/syscall.h> // IWYU pragma: keep
+// IWYU pragma: no_include <syscall.h>
 #include <unistd.h>
 
 namespace gwp_asan {
diff --git a/compiler-rt/lib/gwp_asan/platform_specific/guarded_pool_allocator_posix.cpp b/compiler-rt/lib/gwp_asan/platform_specific/guarded_pool_allocator_posix.cpp
--- a/compiler-rt/lib/gwp_asan/platform_specific/guarded_pool_allocator_posix.cpp
+++ b/compiler-rt/lib/gwp_asan/platform_specific/guarded_pool_allocator_posix.cpp
@@ -6,16 +6,16 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "gwp_asan/common.h"
 #include "gwp_asan/guarded_pool_allocator.h"
+#include "gwp_asan/platform_specific/guarded_pool_allocator_tls.h"
 #include "gwp_asan/utilities.h"
 
 #include <assert.h>
-#include <errno.h>
-#include <signal.h>
+#include <pthread.h>
+#include <stdint.h>
 #include <stdlib.h>
-#include <string.h>
 #include <sys/mman.h>
-#include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 
diff --git a/compiler-rt/lib/gwp_asan/platform_specific/utilities_posix.cpp b/compiler-rt/lib/gwp_asan/platform_specific/utilities_posix.cpp
--- a/compiler-rt/lib/gwp_asan/platform_specific/utilities_posix.cpp
+++ b/compiler-rt/lib/gwp_asan/platform_specific/utilities_posix.cpp
@@ -6,11 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "gwp_asan/definitions.h"
-#include "gwp_asan/utilities.h"
-
-#include <assert.h>
-
 #ifdef __BIONIC__
 #include <stdlib.h>
 extern "C" GWP_ASAN_WEAK void android_set_abort_message(const char *);