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[Bug 1970979] [NEW] compiler flags leaking through krb5-config --libs

To: enterprise-support@xxxxxxxxxxxxxxxxxxx
From: Andreas Hasenack <1970979@xxxxxxxxxxxxxxxxxx>
Date: Fri, 29 Apr 2022 16:31:30 -0000
Reply-to: Bug 1970979 <1970979@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

krb5-config --libs is leaking some compiler specific flags that we
define in Ubuntu:

$ krb5-config --libs 
-L/usr/lib/x86_64-linux-gnu/mit-krb5 -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -flto=auto -Wl,-z,relro -lkrb5 -lk5crypto -lcom_err

That ones that concern me more specifically are:
- -Wl,-Bsymbolic-functions
- -lto related ones

I'm unsure if -Wl,-z,relro should be there either.

It looks like LDFLAGS got mixed with LIBS. pkg-config's output is
different and only contains the libraries and library path:

$ pkg-config --libs krb5
-L/usr/lib/x86_64-linux-gnu/mit-krb5 -lkrb5 -lk5crypto -lcom_err

** Affects: krb5 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1970979

Title:
  compiler flags leaking through krb5-config --libs

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