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

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

[Philippe Mathieu-Daudé]

Suggested fix: Use -Wno-tautological-type-limit-compare in configure:

https://www.mail-archive.com/qemu-devel@nongnu.org/msg699808.html

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

[Philippe Mathieu-Daudé]

Patch posted:
https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00856.html

** Changed in: qemu
       Status: New => In Progress

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

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

Status in QEMU:
  In Progress

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

[Philippe Mathieu-Daudé]

Merged as commit aabab96797a7d61989c25a7ca2b094591bbc74f9.

** Changed in: qemu
       Status: In Progress => Fix Committed

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

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

Status in QEMU:
  Fix Committed

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

[Thomas Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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

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

Status in QEMU:
  Fix Released

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) {
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1878628/+subscriptions