diff --git a/libc/config/darwin/arm/entrypoints.txt b/libc/config/darwin/arm/entrypoints.txt
new file mode 100644
--- /dev/null
+++ b/libc/config/darwin/arm/entrypoints.txt
@@ -0,0 +1,196 @@
+set(TARGET_LIBC_ENTRYPOINTS
+    # ctype.h entrypoints
+    libc.src.ctype.isalnum
+    libc.src.ctype.isalpha
+    libc.src.ctype.isascii
+    libc.src.ctype.isblank
+    libc.src.ctype.iscntrl
+    libc.src.ctype.isdigit
+    libc.src.ctype.isgraph
+    libc.src.ctype.islower
+    libc.src.ctype.isprint
+    libc.src.ctype.ispunct
+    libc.src.ctype.isspace
+    libc.src.ctype.isupper
+    libc.src.ctype.isxdigit
+    libc.src.ctype.toascii
+    libc.src.ctype.tolower
+    libc.src.ctype.toupper
+    
+    # string.h entrypoints
+    libc.src.string.bcmp
+    libc.src.string.bzero
+    libc.src.string.memccpy
+    libc.src.string.memchr
+    libc.src.string.memcmp
+    libc.src.string.memcpy
+    libc.src.string.memmove
+    libc.src.string.mempcpy
+    libc.src.string.memrchr
+    libc.src.string.memset
+    libc.src.string.stpcpy
+    libc.src.string.stpncpy
+    libc.src.string.strcat
+    libc.src.string.strchr
+    libc.src.string.strcmp
+    libc.src.string.strcpy
+    libc.src.string.strcspn
+    libc.src.string.strlen
+    libc.src.string.strncat
+    libc.src.string.strncmp
+    libc.src.string.strncpy
+    libc.src.string.strnlen
+    libc.src.string.strpbrk
+    libc.src.string.strrchr
+    libc.src.string.strspn
+    libc.src.string.strstr
+    libc.src.string.strtok
+    libc.src.string.strtok_r
+
+    # string.h entrypoints that depend on malloc
+    libc.src.string.strdup
+    libc.src.string.strndup
+
+    # inttypes.h entrypoints
+    libc.src.inttypes.imaxdiv
+    libc.src.inttypes.strtoimax
+    libc.src.inttypes.strtoumax
+
+    # stdlib.h entrypoints
+    libc.src.stdlib.abs
+    libc.src.stdlib.atoi
+    libc.src.stdlib.atof
+    libc.src.stdlib.atol
+    libc.src.stdlib.atoll
+    libc.src.stdlib.bsearch
+    libc.src.stdlib.div
+    libc.src.stdlib.labs
+    libc.src.stdlib.ldiv
+    libc.src.stdlib.llabs
+    libc.src.stdlib.lldiv
+    libc.src.stdlib.qsort
+    libc.src.stdlib.strtod
+    libc.src.stdlib.strtof
+    libc.src.stdlib.strtol
+    libc.src.stdlib.strtold
+    libc.src.stdlib.strtoll
+    libc.src.stdlib.strtoul
+    libc.src.stdlib.strtoull
+
+    # stdlib.h external entrypoints
+    libc.src.stdlib.malloc
+    libc.src.stdlib.calloc
+    libc.src.stdlib.realloc
+    libc.src.stdlib.free
+)
+
+set(TARGET_LIBM_ENTRYPOINTS
+    # fenv.h entrypoints
+    libc.src.fenv.feclearexcept
+    libc.src.fenv.fedisableexcept
+    libc.src.fenv.feenableexcept
+    libc.src.fenv.fegetenv
+    libc.src.fenv.fegetexcept
+    libc.src.fenv.fegetexceptflag
+    libc.src.fenv.fegetround
+    libc.src.fenv.feholdexcept
+    libc.src.fenv.fesetenv
+    libc.src.fenv.fesetexceptflag
+    libc.src.fenv.fesetround
+    libc.src.fenv.feraiseexcept
+    libc.src.fenv.fetestexcept
+    libc.src.fenv.feupdateenv
+
+    # math.h entrypoints
+    libc.src.math.copysign
+    libc.src.math.copysignf
+    libc.src.math.copysignl
+    libc.src.math.ceil
+    libc.src.math.ceilf
+    libc.src.math.ceill
+    libc.src.math.cosf
+    libc.src.math.expf
+    libc.src.math.exp2f
+    libc.src.math.expm1f
+    libc.src.math.fabs
+    libc.src.math.fabsf
+    libc.src.math.fabsl
+    libc.src.math.fdim
+    libc.src.math.fdimf
+    libc.src.math.fdiml
+    libc.src.math.floor
+    libc.src.math.floorf
+    libc.src.math.floorl
+    libc.src.math.fma
+    libc.src.math.fmaf
+    libc.src.math.fmax
+    libc.src.math.fmaxf
+    libc.src.math.fmaxl
+    libc.src.math.fmin
+    libc.src.math.fminf
+    libc.src.math.fminl
+    libc.src.math.frexp
+    libc.src.math.frexpf
+    libc.src.math.frexpl
+    libc.src.math.hypot
+    libc.src.math.hypotf
+    libc.src.math.ilogb
+    libc.src.math.ilogbf
+    libc.src.math.ilogbl
+    libc.src.math.llrint
+    libc.src.math.llrintf
+    libc.src.math.llrintl
+    libc.src.math.llround
+    libc.src.math.llroundf
+    libc.src.math.llroundl
+    libc.src.math.lrint
+    libc.src.math.lrintf
+    libc.src.math.lrintl
+    libc.src.math.lround
+    libc.src.math.lroundf
+    libc.src.math.lroundl
+    libc.src.math.ldexp
+    libc.src.math.ldexpf
+    libc.src.math.ldexpl
+    libc.src.math.log10f
+    libc.src.math.log1pf
+    libc.src.math.log2f
+    libc.src.math.logf
+    libc.src.math.logb
+    libc.src.math.logbf
+    libc.src.math.logbl
+    libc.src.math.modf
+    libc.src.math.modff
+    libc.src.math.modfl
+    libc.src.math.nearbyint
+    libc.src.math.nearbyintf
+    libc.src.math.nearbyintl
+    libc.src.math.nextafter
+    libc.src.math.nextafterf
+    libc.src.math.nextafterl
+    libc.src.math.remainderf
+    libc.src.math.remainder
+    libc.src.math.remainderl
+    libc.src.math.remquof
+    libc.src.math.remquo
+    libc.src.math.remquol
+    libc.src.math.rint
+    libc.src.math.rintf
+    libc.src.math.rintl
+    libc.src.math.round
+    libc.src.math.roundf
+    libc.src.math.roundl
+    libc.src.math.sincosf
+    libc.src.math.sinf
+    libc.src.math.sqrt
+    libc.src.math.sqrtf
+    libc.src.math.sqrtl
+    libc.src.math.trunc
+    libc.src.math.truncf
+    libc.src.math.truncl
+)
+
+set(TARGET_LLVMLIBC_ENTRYPOINTS
+  ${TARGET_LIBC_ENTRYPOINTS}
+  ${TARGET_LIBM_ENTRYPOINTS}
+)
diff --git a/libc/config/darwin/arm/headers.txt b/libc/config/darwin/arm/headers.txt
new file mode 100644
--- /dev/null
+++ b/libc/config/darwin/arm/headers.txt
@@ -0,0 +1,9 @@
+set(TARGET_PUBLIC_HEADERS
+    libc.include.ctype
+    libc.include.errno
+    libc.include.fenv
+    libc.include.inttypes
+    libc.include.math
+    libc.include.stdlib
+    libc.include.string
+)
diff --git a/libc/src/__support/FPUtil/FEnvImpl.h b/libc/src/__support/FPUtil/FEnvImpl.h
--- a/libc/src/__support/FPUtil/FEnvImpl.h
+++ b/libc/src/__support/FPUtil/FEnvImpl.h
@@ -12,12 +12,15 @@
 #include "src/__support/architectures.h"
 
 #if defined(LLVM_LIBC_ARCH_AARCH64)
+#if defined(__APPLE__)
+#include "aarch64/fenv_darwin_impl.h"
+#else
 #include "aarch64/FEnvImpl.h"
+#endif
 #elif defined(LLVM_LIBC_ARCH_X86)
 #include "x86_64/FEnvImpl.h"
 #else
 #include <fenv.h>
-#include <math.h>
 
 namespace __llvm_libc {
 namespace fputil {
diff --git a/libc/src/__support/FPUtil/NearestIntegerOperations.h b/libc/src/__support/FPUtil/NearestIntegerOperations.h
--- a/libc/src/__support/FPUtil/NearestIntegerOperations.h
+++ b/libc/src/__support/FPUtil/NearestIntegerOperations.h
@@ -14,10 +14,8 @@
 
 #include "src/__support/CPP/TypeTraits.h"
 
-#include <math.h>
-#if math_errhandling & MATH_ERRNO
 #include <errno.h>
-#endif
+#include <math.h>
 
 namespace __llvm_libc {
 namespace fputil {
@@ -245,12 +243,10 @@
   constexpr I INTEGER_MAX = -(INTEGER_MIN + 1);
   FPBits<F> bits(x);
   auto set_domain_error_and_raise_invalid = []() {
-#if math_errhandling & MATH_ERRNO
-    errno = EDOM;
-#endif
-#if math_errhandling & MATH_ERREXCEPT
-    raise_except(FE_INVALID);
-#endif
+    if (math_errhandling & MATH_ERRNO)
+      errno = EDOM;
+    if (math_errhandling & MATH_ERREXCEPT)
+      raise_except(FE_INVALID);
   };
 
   if (bits.is_inf_or_nan()) {
diff --git a/libc/src/__support/FPUtil/aarch64/FEnvImpl.h b/libc/src/__support/FPUtil/aarch64/FEnvImpl.h
--- a/libc/src/__support/FPUtil/aarch64/FEnvImpl.h
+++ b/libc/src/__support/FPUtil/aarch64/FEnvImpl.h
@@ -11,7 +11,7 @@
 
 #include "src/__support/architectures.h"
 
-#if !defined(LLVM_LIBC_ARCH_AARCH64)
+#if !defined(LLVM_LIBC_ARCH_AARCH64) || defined(__APPLE__)
 #error "Invalid include"
 #endif
 
diff --git a/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h b/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h
new file mode 100644
--- /dev/null
+++ b/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h
@@ -0,0 +1,283 @@
+//===- darwin-aarch64 floating point env manipulation functions -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_SUPPORT_FPUTIL_AARCH64_FENV_DARWIN_IMPL_H
+#define LLVM_LIBC_SRC_SUPPORT_FPUTIL_AARCH64_FENV_DARWIN_IMPL_H
+
+#include "src/__support/architectures.h"
+
+#if !defined(LLVM_LIBC_ARCH_AARCH64) || !defined(__APPLE__)
+#error "Invalid include"
+#endif
+
+#include <arm_acle.h>
+#include <fenv.h>
+#include <stdint.h>
+
+#include "src/__support/FPUtil/FPBits.h"
+
+namespace __llvm_libc {
+namespace fputil {
+
+struct FEnv {
+  struct FPState {
+    uint64_t StatusWord;
+    uint64_t ControlWord;
+  };
+
+  static_assert(
+      sizeof(fenv_t) == sizeof(FPState),
+      "Internal floating point state does not match the public fenv_t type.");
+
+  static constexpr uint32_t TONEAREST = 0x0;
+  static constexpr uint32_t UPWARD = 0x1;
+  static constexpr uint32_t DOWNWARD = 0x2;
+  static constexpr uint32_t TOWARDZERO = 0x3;
+
+  // These will be the exception flags we use for exception values normalized
+  // from both status word and control word.
+  // We add EX_ prefix to the names since macOS <math.h> defines OVERFLOW and
+  // UNDERFLOW macros.
+  static constexpr uint32_t EX_INVALID = 0x1;
+  static constexpr uint32_t EX_DIVBYZERO = 0x2;
+  static constexpr uint32_t EX_OVERFLOW = 0x4;
+  static constexpr uint32_t EX_UNDERFLOW = 0x8;
+  static constexpr uint32_t EX_INEXACT = 0x10;
+  // __APPLE__ ARM64 has an extra flag that is raised when a denormal is flushed
+  // to zero.
+  static constexpr uint32_t EX_FLUSHTOZERO = 0x20;
+
+  // Zero-th bit is the first bit.
+  static constexpr uint32_t ROUNDING_CONTROL_BIT_POSITION = 22;
+
+  // In addition to the 5 floating point exceptions, macOS on arm64 defines
+  // another floating point exception: FE_FLUSHTOZERO, which is controlled by
+  // __fpcr_flush_to_zero bit in the FPCR register.  This control bit is
+  // located in a different place from FE_FLUSHTOZERO status bit relative to
+  // the other exceptions.
+  static inline uint32_t exception_value_from_status(int status) {
+    return (status & FE_INVALID ? EX_INVALID : 0) |
+           (status & FE_DIVBYZERO ? EX_DIVBYZERO : 0) |
+           (status & FE_OVERFLOW ? EX_OVERFLOW : 0) |
+           (status & FE_UNDERFLOW ? EX_UNDERFLOW : 0) |
+           (status & FE_INEXACT ? EX_INEXACT : 0) |
+           (status & FE_FLUSHTOZERO ? EX_FLUSHTOZERO : 0);
+  }
+
+  static inline uint32_t exception_value_from_control(int control) {
+    return (control & __fpcr_trap_invalid ? EX_INVALID : 0) |
+           (control & __fpcr_trap_divbyzero ? EX_DIVBYZERO : 0) |
+           (control & __fpcr_trap_overflow ? EX_OVERFLOW : 0) |
+           (control & __fpcr_trap_underflow ? EX_UNDERFLOW : 0) |
+           (control & __fpcr_trap_inexact ? EX_INEXACT : 0) |
+           (control & __fpcr_flush_to_zero ? EX_FLUSHTOZERO : 0);
+  }
+
+  static inline int exception_value_to_status(uint32_t excepts) {
+    return (excepts & EX_INVALID ? FE_INVALID : 0) |
+           (excepts & EX_DIVBYZERO ? FE_DIVBYZERO : 0) |
+           (excepts & EX_OVERFLOW ? FE_OVERFLOW : 0) |
+           (excepts & EX_UNDERFLOW ? FE_UNDERFLOW : 0) |
+           (excepts & EX_INEXACT ? FE_INEXACT : 0) |
+           (excepts & EX_FLUSHTOZERO ? FE_FLUSHTOZERO : 0);
+  }
+
+  static inline int exception_value_to_control(uint32_t excepts) {
+    return (excepts & EX_INVALID ? __fpcr_trap_invalid : 0) |
+           (excepts & EX_DIVBYZERO ? __fpcr_trap_divbyzero : 0) |
+           (excepts & EX_OVERFLOW ? __fpcr_trap_overflow : 0) |
+           (excepts & EX_UNDERFLOW ? __fpcr_trap_underflow : 0) |
+           (excepts & EX_INEXACT ? __fpcr_trap_inexact : 0) |
+           (excepts & EX_FLUSHTOZERO ? __fpcr_flush_to_zero : 0);
+  }
+
+  static uint32_t get_control_word() { return __arm_rsr("fpcr"); }
+
+  static void set_control_word(uint32_t fpcr) { __arm_wsr("fpcr", fpcr); }
+
+  static uint32_t get_status_word() { return __arm_rsr("fpsr"); }
+
+  static void set_status_word(uint32_t fpsr) { __arm_wsr("fpsr", fpsr); }
+};
+
+static inline int enable_except(int excepts) {
+  uint32_t new_excepts = FEnv::exception_value_from_status(excepts);
+  uint32_t control_word = FEnv::get_control_word();
+  uint32_t old_excepts = FEnv::exception_value_from_control(control_word);
+  if (new_excepts != old_excepts) {
+    control_word |= FEnv::exception_value_to_control(new_excepts);
+    FEnv::set_control_word(control_word);
+  }
+  return FEnv::exception_value_to_status(old_excepts);
+}
+
+static inline int disable_except(int excepts) {
+  uint32_t disabled_excepts = FEnv::exception_value_from_status(excepts);
+  uint32_t control_word = FEnv::get_control_word();
+  uint32_t old_excepts = FEnv::exception_value_from_control(control_word);
+  control_word &= ~FEnv::exception_value_to_control(disabled_excepts);
+  FEnv::set_control_word(control_word);
+  return FEnv::exception_value_to_status(old_excepts);
+}
+
+static inline int get_except() {
+  uint32_t control_word = FEnv::get_control_word();
+  uint32_t enabled_excepts = FEnv::exception_value_from_control(control_word);
+  return FEnv::exception_value_to_status(enabled_excepts);
+}
+
+static inline int clear_except(int excepts) {
+  uint32_t status_word = FEnv::get_status_word();
+  uint32_t except_value = FEnv::exception_value_from_status(excepts);
+  status_word &= ~FEnv::exception_value_to_status(except_value);
+  FEnv::set_status_word(status_word);
+  return 0;
+}
+
+static inline int test_except(int excepts) {
+  uint32_t statusWord = FEnv::get_status_word();
+  uint32_t ex_value = FEnv::exception_value_from_status(excepts);
+  return statusWord & FEnv::exception_value_to_status(ex_value);
+}
+
+static inline int set_except(int excepts) {
+  uint32_t status_word = FEnv::get_status_word();
+  uint32_t new_exceptions = FEnv::exception_value_from_status(excepts);
+  status_word |= FEnv::exception_value_to_status(new_exceptions);
+  FEnv::set_status_word(status_word);
+  return 0;
+}
+
+static inline int raise_except(int excepts) {
+  float zero = 0.0f;
+  float one = 1.0f;
+  float large_value = float(FPBits<float>(FPBits<float>::MAX_NORMAL));
+  float small_value = float(FPBits<float>(FPBits<float>::MIN_NORMAL));
+  auto divfunc = [](float a, float b) {
+    __asm__ __volatile__("ldr  s0, %0\n\t"
+                         "ldr  s1, %1\n\t"
+                         "fdiv s0, s0, s1\n\t"
+                         : // No outputs
+                         : "m"(a), "m"(b)
+                         : "s0", "s1" /* s0 and s1 are clobbered */);
+  };
+
+  uint32_t to_raise = FEnv::exception_value_from_status(excepts);
+  int result = 0;
+
+  if (to_raise & FEnv::EX_INVALID) {
+    divfunc(zero, zero);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_INVALID))
+      result = -1;
+  }
+
+  if (to_raise & FEnv::EX_DIVBYZERO) {
+    divfunc(one, zero);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_DIVBYZERO))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_OVERFLOW) {
+    divfunc(large_value, small_value);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_OVERFLOW))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_UNDERFLOW) {
+    divfunc(small_value, large_value);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_UNDERFLOW))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_INEXACT) {
+    float two = 2.0f;
+    float three = 3.0f;
+    // 2.0 / 3.0 cannot be represented exactly in any radix 2 floating point
+    // format.
+    divfunc(two, three);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_INEXACT))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_FLUSHTOZERO) {
+    // TODO: raise the flush to zero floating point exception.
+    result = -1;
+  }
+  return result;
+}
+
+static inline int get_round() {
+  uint32_t rounding_mode =
+      (FEnv::get_control_word() >> FEnv::ROUNDING_CONTROL_BIT_POSITION) & 0x3;
+  switch (rounding_mode) {
+  case FEnv::TONEAREST:
+    return FE_TONEAREST;
+  case FEnv::DOWNWARD:
+    return FE_DOWNWARD;
+  case FEnv::UPWARD:
+    return FE_UPWARD;
+  case FEnv::TOWARDZERO:
+    return FE_TOWARDZERO;
+  default:
+    return -1; // Error value.
+  }
+}
+
+static inline int set_round(int mode) {
+  uint16_t bit_value;
+  switch (mode) {
+  case FE_TONEAREST:
+    bit_value = FEnv::TONEAREST;
+    break;
+  case FE_DOWNWARD:
+    bit_value = FEnv::DOWNWARD;
+    break;
+  case FE_UPWARD:
+    bit_value = FEnv::UPWARD;
+    break;
+  case FE_TOWARDZERO:
+    bit_value = FEnv::TOWARDZERO;
+    break;
+  default:
+    return 1; // To indicate failure
+  }
+
+  uint32_t control_word = FEnv::get_control_word();
+  control_word &= ~(0x3 << FEnv::ROUNDING_CONTROL_BIT_POSITION);
+  control_word |= (bit_value << FEnv::ROUNDING_CONTROL_BIT_POSITION);
+  FEnv::set_control_word(control_word);
+
+  return 0;
+}
+
+static inline int get_env(fenv_t *envp) {
+  FEnv::FPState *state = reinterpret_cast<FEnv::FPState *>(envp);
+  state->ControlWord = FEnv::get_control_word();
+  state->StatusWord = FEnv::get_status_word();
+  return 0;
+}
+
+static inline int set_env(const fenv_t *envp) {
+  if (envp == FE_DFL_ENV) {
+    // Default status and control words bits are all zeros so we just
+    // write zeros.
+    FEnv::set_status_word(0);
+    FEnv::set_control_word(0);
+    return 0;
+  }
+  const FEnv::FPState *state = reinterpret_cast<const FEnv::FPState *>(envp);
+  FEnv::set_control_word(state->ControlWord);
+  FEnv::set_status_word(state->StatusWord);
+  return 0;
+}
+
+} // namespace fputil
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_SUPPORT_FPUTIL_AARCH64_FENV_DARWIN_IMPL_H
diff --git a/libc/src/__support/common.h b/libc/src/__support/common.h
--- a/libc/src/__support/common.h
+++ b/libc/src/__support/common.h
@@ -19,7 +19,8 @@
 #define LLVM_LIBC_FUNCTION_ATTR
 #endif
 
-#ifdef LLVM_LIBC_PUBLIC_PACKAGING
+// MacOS needs to be excluded because it does not support aliasing.
+#if defined(LLVM_LIBC_PUBLIC_PACKAGING) && (!defined(__APPLE__))
 #define LLVM_LIBC_FUNCTION(type, name, arglist)                                \
   LLVM_LIBC_FUNCTION_ATTR decltype(__llvm_libc::name)                          \
       __##name##_impl__ __asm__(#name);                                        \
diff --git a/libc/src/__support/str_to_float.h b/libc/src/__support/str_to_float.h
--- a/libc/src/__support/str_to_float.h
+++ b/libc/src/__support/str_to_float.h
@@ -458,8 +458,9 @@
 #if defined(LONG_DOUBLE_IS_DOUBLE)
 template <> class ClingerConsts<long double> {
 public:
-  static constexpr long double POWERS_OF_TEN_ARRAY[] =
-      ClingerConsts<double>::POWERS_OF_TEN_ARRAY;
+  static constexpr long double POWERS_OF_TEN_ARRAY[] = {
+      1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10, 1e11,
+      1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22};
   static constexpr int32_t EXACT_POWERS_OF_TEN =
       ClingerConsts<double>::EXACT_POWERS_OF_TEN;
   static constexpr int32_t DIGITS_IN_MANTISSA =
diff --git a/libc/test/src/fenv/CMakeLists.txt b/libc/test/src/fenv/CMakeLists.txt
--- a/libc/test/src/fenv/CMakeLists.txt
+++ b/libc/test/src/fenv/CMakeLists.txt
@@ -85,11 +85,13 @@
     libc.src.fenv.fegetexcept
 )
 
-if (NOT (LLVM_USE_SANITIZER OR (${LIBC_TARGET_OS} STREQUAL "windows")))
+if (NOT (LLVM_USE_SANITIZER OR (${LIBC_TARGET_OS} STREQUAL "windows")
+         OR (${LIBC_TARGET_OS} STREQUAL "darwin")))
   # Sanitizers don't like SIGFPE. So, we will run the 
   # tests which raise SIGFPE only in non-sanitizer builds.
-  # The tests are also disabled for Windows as they fail currently.
-  # TODO: Investigate and fix the windows failures and enable them for Windows.
+  # The tests are also disabled for Windows and MacOS as they fail currently.
+  # TODO: Investigate and fix the windows failures and enable them for Windows
+  # and MacOS.
   add_fp_unittest(
     enabled_exceptions_test
     SUITE
diff --git a/libc/test/src/math/RoundToIntegerTest.h b/libc/test/src/math/RoundToIntegerTest.h
--- a/libc/test/src/math/RoundToIntegerTest.h
+++ b/libc/test/src/math/RoundToIntegerTest.h
@@ -73,12 +73,12 @@
 
 public:
   void SetUp() override {
-#if math_errhandling & MATH_ERREXCEPT
-    // We will disable all exceptions so that the test will not
-    // crash with SIGFPE. We can still use fetestexcept to check
-    // if the appropriate flag was raised.
-    __llvm_libc::fputil::disable_except(FE_ALL_EXCEPT);
-#endif
+    if (math_errhandling & MATH_ERREXCEPT) {
+      // We will disable all exceptions so that the test will not
+      // crash with SIGFPE. We can still use fetestexcept to check
+      // if the appropriate flag was raised.
+      __llvm_libc::fputil::disable_except(FE_ALL_EXCEPT);
+    }
   }
 
   void do_infinity_and_na_n_test(RoundToIntegerFunc func) {
diff --git a/libc/test/src/stdlib/strtold_test.cpp b/libc/test/src/stdlib/strtold_test.cpp
--- a/libc/test/src/stdlib/strtold_test.cpp
+++ b/libc/test/src/stdlib/strtold_test.cpp
@@ -175,12 +175,12 @@
 TEST_F(LlvmLibcStrToLDTest, ComplexHexadecimalTests) {
   run_test("0x1p16383", 9, 0x7ff0000000000000,
            (__uint128_t(0x7ffe800000) << 40),
-           (__uint128_t(0x7ffe000000000000) << 64));
+           (__uint128_t(0x7ffe000000000000) << 64), ERANGE);
   run_test("0x123456789abcdef", 17, 0x43723456789abcdf,
            (__uint128_t(0x403791a2b3) << 40) + __uint128_t(0xc4d5e6f780),
            (__uint128_t(0x403723456789abcd) << 64) +
                __uint128_t(0xef00000000000000));
-  run_test("0x123456789abcdef0123456789ABCDEF", 33, 0x7ff0000000000000,
+  run_test("0x123456789abcdef0123456789ABCDEF", 33, 0x47723456789abcdf,
            (__uint128_t(0x407791a2b3) << 40) + __uint128_t(0xc4d5e6f781),
            (__uint128_t(0x407723456789abcd) << 64) +
                __uint128_t(0xef0123456789abce));