Hello,
Squid build produces lots of warnings in modern build environments
such as Ubuntu 16.04:
> make > /dev/null
> /usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
> /usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
...
> /usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
> ar: `u' modifier ignored since `D' is the default (see `U')
> ar: `u' modifier ignored since `D' is the default (see `U')
> /usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
> /usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
...
These benign warnings is most likely an ancient Automake bug awaken by
recent environmental changes. It is becoming a well-known issue among
many projects AFAICT. The attached Web Polygraph patch works around this
problem. The patch preamble has more technical references.
If you think Squid should do something like this, please consider
adopting and adjusting this patch as needed for Squid.
Thank you,
Alex.
Work around a recently exposed automake bug producing ar warnings
ar: `u' modifier ignored since `D' is the default
... on Ubuntu 16.04 and other "modern" systems.
See also:
https://github.com/kimwalisch/primesieve/issues/16
https://bugzilla.redhat.com/show_bug.cgi?id=1155273#c12
diff --git b/configure.ac a/configure.ac
index ddb442e..17835f7 100644
--- b/configure.ac
+++ a/configure.ac
@@ -51,6 +51,11 @@ dnl check for programs
AC_PROG_CXX
AC_PROG_CXXCPP
AC_PROG_INSTALL
+
+dnl A temporary workaround to silence ar warning:
+dnl `u' modifier ignored since `D' is the default
+AC_SUBST(ARFLAGS, [cr])
+AC_SUBST(AR_FLAGS, [cr])
AM_PROG_AR
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