libicu autodetect doesn't work in Ubuntu14.04

[psalic]

Hi,

It showed that libicu autodetect doesn't work in Ubuntu14.04. I made a fix that solves the issue.
I found that same code can be compiled with apple compiler which would fail. That is reason I added cfg depend.

Otherwise I also made fix for macos if someone likes to use with homebrew licicu. I attach full patch_full.txt.
It compiles with command:
EDIT_CFG_ICUUC_SONAME="libicuuc.dylib" EDIT_CFG_ICUI18N_SONAME="libicui18n.dylib" EDIT_CFG_ICU_RENAMING_AUTO_DETECT="true" RUSTFLAGS="-C link-arg=-Wl,-rpath,/opt/homebrew/opt/icu4c/lib" cargo build --release

Regards, Primoz

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[psalic]

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[DHowett]

Can you explain a little more in depth how this works? We thought you could just set EDIT_CFG_ICUUC_SONAME and friends in any build environment on any version of any Linux distribution. Why is that insufficient on Ubuntu 14.04? (Also: that version is 12 years old, I'm surprised someone is still using it!)

Thanks!

[DHowett]

Whether or not we should do this: dl_iterate_phdr is apparently Linux-specific, and this project works fine on other Unixes e.g. NetBSD

[psalic]

definition from GNU.
dl_iterate_phdr - walk through list of shared objects

In callback you receive structure dl_phdr_info which include filename of shared object. Once callback return non zero value dl_iterate_phdr finishes it job.

As I check docs dl_iterate_phdr is also implemented on BSD Unix operation systems.

I know Ubuntu 14.04 is old but looks that also 16.04 has same problem. Canonical still supports 14.04 in pro program.

Problem on Ubuntu14.04 originates that symbol "_ZN8UCaseMapD1Ev "is not present in libicu library.