cargo upgrade to 0.31.1_1 fails due to dyld: Symbol not found

[hapaguy (Brian Kurt Fujikawa)]

Xcode 10.1 on macOS 10.14.1

cargo upgrade to 0.31.1_1 fails:

$ sudo port -sv upgrade cargo
...
dyld: Symbol not found: __cg_jpeg_resync_to_restart
  Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /opt/local/lib/libJPEG.dylib
...

I believe that this issue is due to the wrong libJPEG.dylib is loaded, i.e.

/opt/local/lib/libJPEG.dylib

is loaded instead of the correct:

/System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libJPEG.dylib

This issue has been encountered in the past on other ports, for example: #57594.

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

In ed645cc03c46e4d41fae0370b06777abbd6e89ce/macports-ports (master):

cargo: avoid setting DYLD_LIBRARY_PATH

Revert part of 08960a3ac3a1c9690e149206156ccf0e53afd8e0/macports-ports

Fixes #57692
See ​https://github.com/rust-lang/cargo/pull/6355

[l2dy (Zero King)]

In 25afe58050b2d5eb3b0cb76351086d7935483006/macports-ports (master):

ruby{24,25}: avoid setting DYLD_LIBRARY_PATH

Fix building some [gems with extensions](​https://guides.rubygems.org/gems-with-extensions/).

A similar issue was discovered in cargo, see #57692.

Upstream fix was applied in Ruby 2.6:

$ grep LIBPATHENV=DYLD ruby-2.*/configure
ruby-2.4.9/configure: : ${LIBPATHENV=DYLD_LIBRARY_PATH}
ruby-2.5.7/configure: : ${LIBPATHENV=DYLD_LIBRARY_PATH}
ruby-2.6.5/configure: : ${LIBPATHENV=DYLD_FALLBACK_LIBRARY_PATH}

Upstream commit: ​https://github.com/ruby/ruby/commit/1961c786aab243b3eb60e7238224e87975d88056