9 files changed, 49 insertions, 13 deletions
diff --git a/flang/include/flang/Common/windows-include.h b/flang/include/flang/Common/windows-include.h
new file mode 100644
index 0000000..75ef497
--- /dev/null
+++ b/flang/include/flang/Common/windows-include.h
@@ -0,0 +1,25 @@
+//===-- include/flang/Common/windows-include.h ------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Wrapper around windows.h that works around the name conflicts.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef FORTRAN_COMMON_WINDOWS_INCLUDE_H_
+#define FORTRAN_COMMON_WINDOWS_INCLUDE_H_
+
+#ifdef _WIN32
+
+#define WIN32_LEAN_AND_MEAN
+#define NOMINMAX
+
+#include <windows.h>
+
+#endif // _WIN32
+
+#endif // FORTRAN_COMMON_WINDOWS_INCLUDE_H_
diff --git a/flang/runtime/command.cpp b/flang/runtime/command.cpp
index fabfe60..b573c5d 100644
--- a/flang/runtime/command.cpp
+++ b/flang/runtime/command.cpp
@@ -16,9 +16,7 @@
 #include <limits>
 
 #ifdef _WIN32
-#define WIN32_LEAN_AND_MEAN
-#define NOMINMAX
-#include <windows.h>
+#include "flang/Common/windows-include.h"
 
 // On Windows GetCurrentProcessId returns a DWORD aka uint32_t
 #include <processthreadsapi.h>
diff --git a/flang/runtime/execute.cpp b/flang/runtime/execute.cpp
index c84930c..0f5bc50 100644
--- a/flang/runtime/execute.cpp
+++ b/flang/runtime/execute.cpp
@@ -16,9 +16,7 @@
 #include <future>
 #include <limits>
 #ifdef _WIN32
-#define LEAN_AND_MEAN
-#define NOMINMAX
-#include <windows.h>
+#include "flang/Common/windows-include.h"
 #else
 #include <signal.h>
 #include <sys/wait.h>
diff --git a/flang/runtime/file.cpp b/flang/runtime/file.cpp
index 67764f1..acd5d33d 100644
--- a/flang/runtime/file.cpp
+++ b/flang/runtime/file.cpp
@@ -17,9 +17,8 @@
 #include <stdlib.h>
 #include <sys/stat.h>
 #ifdef _WIN32
-#define NOMINMAX
+#include "flang/Common/windows-include.h"
 #include <io.h>
-#include <windows.h>
 #else
 #include <unistd.h>
 #endif
diff --git a/flang/runtime/lock.h b/flang/runtime/lock.h
index 9f27a82..46ca287 100644
--- a/flang/runtime/lock.h
+++ b/flang/runtime/lock.h
@@ -25,9 +25,7 @@
 #if USE_PTHREADS
 #include <pthread.h>
 #elif defined(_WIN32)
-// Do not define macros for "min" and "max"
-#define NOMINMAX
-#include <windows.h>
+#include "flang/Common/windows-include.h"
 #else
 #include <mutex>
 #endif
diff --git a/libc/cmake/modules/LLVMLibCCompileOptionRules.cmake b/libc/cmake/modules/LLVMLibCCompileOptionRules.cmake
index 40a1cfd..5b3a10d 100644
--- a/libc/cmake/modules/LLVMLibCCompileOptionRules.cmake
+++ b/libc/cmake/modules/LLVMLibCCompileOptionRules.cmake
@@ -43,6 +43,7 @@ function(_get_common_compile_options output_var flags)
     list(APPEND compile_options "-fpie")
 
     if(LLVM_LIBC_FULL_BUILD)
+      list(APPEND compile_options "-DLIBC_FULL_BUILD")
       # Only add -ffreestanding flag in full build mode.
       list(APPEND compile_options "-ffreestanding")
     endif()
@@ -126,6 +127,7 @@ function(_get_common_test_compile_options output_var c_test flags)
     list(APPEND compile_options "-fpie")
 
     if(LLVM_LIBC_FULL_BUILD)
+      list(APPEND compile_options "-DLIBC_FULL_BUILD")
       # Only add -ffreestanding flag in full build mode.
       list(APPEND compile_options "-ffreestanding")
       list(APPEND compile_options "-fno-exceptions")
@@ -178,5 +180,10 @@ function(_get_hermetic_test_compile_options output_var flags)
          -Wno-multi-gpu --cuda-path=${LIBC_CUDA_ROOT}
          -nogpulib -march=${LIBC_GPU_TARGET_ARCHITECTURE} -fno-use-cxa-atexit)
   endif()
+
+  if(LLVM_LIBC_FULL_BUILD)
+    list(APPEND compile_options "-DLIBC_FULL_BUILD")
+  endif()
+  
   set(${output_var} ${compile_options} PARENT_SCOPE)
 endfunction()
diff --git a/libc/include/llvm-libc-macros/math-macros.h b/libc/include/llvm-libc-macros/math-macros.h
index 1497e32..6046ea9 100644
--- a/libc/include/llvm-libc-macros/math-macros.h
+++ b/libc/include/llvm-libc-macros/math-macros.h
@@ -9,6 +9,11 @@
 #ifndef LLVM_LIBC_MACROS_MATH_MACROS_H
 #define LLVM_LIBC_MACROS_MATH_MACROS_H
 
+// TODO: Remove this. This is a temporary fix for a downstream problem.
+// This cannot be left permanently since it would require downstream users to
+// define this macro.
+#ifdef LIBC_FULL_BUILD
+
 #include "limits-macros.h"
 
 #define FP_NAN 0
@@ -79,4 +84,10 @@ template <typename T> inline constexpr bool isnan(T x) {
 
 #endif
 
+#else // LIBC_FULL_BUILD
+
+#include <math.h>
+
+#endif // LIBC_FULL_BUILD
+
 #endif // LLVM_LIBC_MACROS_MATH_MACROS_H
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index d8375de..b8cd290 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -68,7 +68,6 @@ libc_support_library(
     name = "llvm_libc_macros_math_macros",
     hdrs = ["include/llvm-libc-macros/math-macros.h"],
     deps = [":llvm_libc_macros_limits_macros"],
-    defines = ["__FP_LOGBNAN_MIN"],
 )
 
 libc_support_library(
@@ -1000,8 +999,8 @@ libc_support_library(
 
 libc_support_library(
     name = "__support_osutil_quick_exit",
-    hdrs = ["src/__support/OSUtil/quick_exit.h"],
     srcs = ["src/__support/OSUtil/linux/quick_exit.cpp"],
+    hdrs = ["src/__support/OSUtil/quick_exit.h"],
     deps = [
         ":__support_osutil_syscall",
     ],
diff --git a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
index ddd3e69..497edcf 100644
--- a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
@@ -4275,6 +4275,7 @@ cc_library(
         ":AffineDialect",
         ":Analysis",
         ":ArithDialect",
+        ":ArithUtils",
         ":DialectUtils",
         ":FuncDialect",
         ":IR",