[Bug 1878628] [NEW] linux-user/mmap build failure using Clang 10

[Philippe Mathieu-Daudé]

Public bug reported:

When building with Clang 10 on Fedora 32, we get:

    CC      linux-user/mmap.o
  linux-user/mmap.c:720:49: error: result of comparison 'unsigned long' > 
18446744073709551615 is always false [-Werror,-Wtautological-type-limit-compare]
          if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1878628

Title:
  linux-user/mmap build failure using Clang 10

Status in QEMU:
  New

Bug description:
  When building with Clang 10 on Fedora 32, we get:

      CC      linux-user/mmap.o
    linux-user/mmap.c:720:49: error: result of comparison 'unsigned long' > 
18446744073709551615 is always false [-Werror,-Wtautological-type-limit-compare]
            if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~

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