From 694264427f55bc6f44c6284c3a1ad223169e851e Mon Sep 17 00:00:00 2001
From: MarcoFalke <falke.marco@gmail.com>
Date: Fri, 22 Oct 2021 12:28:03 +0200
Subject: [PATCH] Merge bitcoin/bitcoin#23335: refactor: include a missing
 <limits> header in fs.cpp

077a875d94b51e3c87381133657be98989c8643e refactor: include a missing <limits> header in fs.cpp (Joan Karadimov)

Pull request description:

  I get this compilation error on versions `0.21.1` and `22.0`:

  ```
  fs.cpp: In member function 'bool fsbridge::FileLock::TryLock()':
  fs.cpp:123:89: error: 'numeric_limits' is not a member of 'std'
    123 |     if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
        |                                                                                         ^~~~~~~~~~~~~~
  fs.cpp:123:109: error: expected primary-expression before '>' token
    123 |     if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
        |                                                                                                             ^
  fs.cpp:123:112: error: '::max' has not been declared; did you mean 'std::max'?
    123 |     if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
        |                                                                                                                ^~~
        |                                                                                                                std::max
  In file included from C:/dev/msys64/mingw64/include/c++/11.2.0/bits/char_traits.h:39,
                   from C:/dev/msys64/mingw64/include/c++/11.2.0/string:40,
                   from ./fs.h:9,
                   from fs.cpp:5:
  C:/dev/msys64/mingw64/include/c++/11.2.0/bits/stl_algobase.h:300:5: note: 'std::max' declared here
    300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
        |     ^~~
  fs.cpp:123:124: error: 'numeric_limits' is not a member of 'std'
    123 |     if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
        |                                                                                                                            ^~~~~~~~~~~~~~
  fs.cpp:123:144: error: expected primary-expression before '>' token
    123 |     if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
        |                                                                                                                                                ^
  fs.cpp:123:147: error: '::max' has not been declared; did you mean 'std::max'?
    123 |     if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
        |                                                                                                                                                   ^~~
        |                                                                                                                                                   std::max
  In file included from C:/dev/msys64/mingw64/include/c++/11.2.0/bits/char_traits.h:39,
                   from C:/dev/msys64/mingw64/include/c++/11.2.0/string:40,
                   from ./fs.h:9,
                   from fs.cpp:5:
  C:/dev/msys64/mingw64/include/c++/11.2.0/bits/stl_algobase.h:300:5: note: 'std::max' declared here
    300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
        |     ^~~
  ```

  It appears that `std::numeric_limits<T>::max` is used without the `limits` header being included. Probably on other STL implementations it's included transitively, but not in the one in MinGW. Including it fixes the compilation problem.

  Environment:
  OS: Windows 10
  Compiler: gcc 11.2.0
  Qt: 5.15.2 (included in msys2)
  Using the latest mingw w64 shipped with msys2.

ACKs for top commit:
  fanquake:
    ACK 077a875d94b51e3c87381133657be98989c8643e - Thanks.
  hebasto:
    ACK 077a875d94b51e3c87381133657be98989c8643e

Tree-SHA512: 2289cb72fa3a28470f4250833be66079482d1392189b1e4679330dad109a8ae67b1d6d51cb635dbc1947c00c6c4cfbc4d7c9ae02269b932cfa1475583adaf73d
---
 src/fs.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/fs.cpp b/src/fs.cpp
index 5a75c6317e..0782961a45 100644
--- a/src/fs.cpp
+++ b/src/fs.cpp
@@ -14,6 +14,7 @@
 #define NOMINMAX
 #endif
 #include <codecvt>
+#include <limits>
 #include <windows.h>
 #endif