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

[Andreas Hasenack]

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

Status in krb5 package in Ubuntu:
  New

Bug description:
  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

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