[Xquartz-dev] Newbie question about building XQuartz: autoreconf fails

[Jeremy Huddleston Sequoia]

> On Jul 18, 2017, at 20:59, Tom Lane <tgl at sss.pgh.pa.us> wrote:
> 
> Jeremy Huddleston Sequoia <jeremyhu at apple.com> writes:
>>> On Jul 16, 2017, at 16:26, Tom Lane <tgl at sss.pgh.pa.us> wrote:
>>> I dug into it and determined that even though _XSERVTransSocketReopen is
>>> being very careful to allocate the correct amount of memory, gcc is
>>> deciding to generate a __strlcpy_chk() call that abort()s if the string
>>> length is >= 14 bytes, because it thinks the declared size of struct
>>> sockaddr.sa_data is a hard limit that it ought to enforce.
> 
>> Yeah.  That's unfortunate misunderstanding of POSIX on the part of the compiler team there.  Was it really FSF gcc that you're using?  If so, please file a bug at https://gcc.gnu.org/bugzilla
> 
> Nope ...
> 
>> If you're seeing that with clang, pleas let me know what version of clang.  I thought we fixed clang's over-zealous __builtin_object_size before it was released.
> 
> This is current Xcode, as I said before.
> 
> $ gcc -v
> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
> Apple LLVM version 8.1.0 (clang-802.0.42)
> Target: x86_64-apple-darwin16.6.0
> Thread model: posix
> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Ok, then that is clang, not gcc ;) ... gcc is just an alias for clang for folks with gcc muscle memory ;)

Here's the background on the bug:  https://bugs.llvm.org/show_bug.cgi?id=30346

I know it was an issue in the OSS releases of 3.8 and 3.9, but I thought it was never in an Xcode release.  Unfortunately, it looks like the bug did indeed ship in Xcode 8.3.  Luckily, it's not present in Xcode 9.

--Jeremy

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