[Bug 94309] [PATCH] Fix -Werror build for clang and FreeBSD

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94309

--- Comment #1 from Ting-Wei Lan <lantw44 at gmail.com> ---
Created attachment 121985
  --> https://bugs.freedesktop.org/attachment.cgi?id=121985&action=edit
Fix -Werror build for clang and FreeBSD

Replace -D_POSIX_SOURCE with -D_POSIX_C_SOURCE=200809L because the
former macro limits POSIX standard version to 1003.1-1988 on FreeBSD,
which causes atoll function to be unavailable.

-Wtautological-constant-out-of-range-compare is ignored in a
g_return_val_if_fail because the warning cannot be avoided.

Self assignments are removed to prevent warnings.

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