LuaJIT @2.0.3 distribution broken by MacPorts: "Segmentation fault: 11"

[macports.jgonggrijp@…]

OS X 10.9.5, Xcode 6.0.1

While trying to run my project Euler solutions (that I wrote in Lua), I found that MacPorts-installed LuaJIT 2.0.3 crashes on nearly all scripts with "Segmentation fault: 11". Only two, extremely trivial scripts run as expected. I will attach two example scripts: 052.lua (project Euler spoiler alert), which crashes, and loops.lua, which doesn't.

I have verified that the fault is with MacPorts by downloading LuaJIT 2.0.3 directly from luajit.org and running the plain vanilla installation with make && make install. The resulting executable (installed under /usr/local/bin) runs all scripts perfectly fine.

Uninstalling, cleaning and reinstalling the port does not help. The problem persists.

The LuaJIT installation page contains some instructions for distribution maintainer (see bottom of ​http://luajit.org/install.html), which seem to indicate that the software can be easily broken by changing too much about the installation procedure.

[macports.jgonggrijp@…]

example of a script on which luajit crashes with segmentation fault 11

[macports.jgonggrijp@…]

example of a script on which luajit does not crash

[ryandesign (Ryan Carsten Schmidt)]

I can confirm that 052.lua crashes for me too.

But I'm not sure what we should do. We're not doing anything strange in the luajit portfile​ that I can see. I looked over the aforementioned Admonishments for Distribution Maintainers and I don't think we're violating any of those directives. We are making the amalg target; we aren't patching Makefiles or luaconf.h.

On my system the crash log shows the crash is in libunwind.dylib, in libunwind::CompactUnwinder_x86_64. That's a bit weird.

[ryandesign (Ryan Carsten Schmidt)]

I tried the attached 052.lua​ script with luajit @2.0.5 on some different OS versions:

• ✅ works on Mac OS X 10.6.8, Xcode 3.2.6, gcc 4.2.1
• 💣 crashes on Mac OS X 10.7.5, Xcode 4.6.3, clang-425.0.28
• 💣 crashes on OS X 10.8.5, Xcode 5.1.1, clang-503.0.40
• 💣 crashes on OS X 10.9.5, Xcode 6.2, clang-600.0.57
• ✅ works on OS X 10.10.5, Xcode 7.2.1, clang-700.1.81
• ✅ works on OS X 10.11.6, Xcode 8.2.1, clang-800.0.42.1
• ✅ works on macOS 10.12.6, Xcode 9.2, clang-900.0.39.2
• ✅ works on macOS 10.13.6, Xcode 9.4.1, clang-902.0.39.2

This makes me think maybe the following should be added to the portfile:

PortGroup compiler_blacklist_versions 1.0

compiler.blacklist-append {clang < 700}

I can test this next and see if it helps.

[ryandesign (Ryan Carsten Schmidt)]

In f3c476e954e258ed5938447db9669321aa894871/macports-ports (master):

luajit: Blacklist clang < 700

Fixes runtime crash on Mac OS X 10.7, 10.8, 10.9.

Closes: #45343

[ryandesign (Ryan Carsten Schmidt)]

I should've tested on more systems before committing. I only tested on 10.9; since that's a libc++ system MacPorts picked the macports-clang-5.0 compiler which compiles working luajit code. But on 10.8, which is a libstdc++ system, MacPorts picked the older macports-clang-3.4, which still miscompiles luajit.

[ryandesign (Ryan Carsten Schmidt)]

In 27b5cf42f99e0639a910756d62456d7cc2733d3f/macports-ports (master):

luajit: Blacklist MacPorts clang 3.3 and 3.4

Fixes runtime crash on Mac OS X 10.7 and 10.8.

Closes: #45343