[PATCH] Add --with-ext-lib-XXX support to SMB_EXT_LIB_FROM_PKGCONFIG

[Sam Liddicott]

Where XXX is also the first argument to SMB_EXT_LIB_FROM_PKGCONFIG
e.g.

as
  SMB_EXT_LIB_FROM_PKGCONFIG(LIBLDB, ....
exists in configure.ac it is now also possible to force selection
of the built-in LIBLDB, or the external LDB, or to prefer the
external LIBLDB if it is present by passing to ./configure

--with-ext-lib-LIBLDB
or
--without-ext-lib-LIBLDB
or
--with-ext-lib-LIBLDB=auto

The behavour defaults to "auto" but can be specified in a new
5th parameter to SMB_EXT_LIB_FROM_PKGCONFIG.

Signed-off-by: Sam Liddicott <sam at liddicott.com>
---
 source4/build/m4/public.m4 |  116
+++++++++++++++++++++++++------------------
 1 files changed, 67 insertions(+), 49 deletions(-)

Metze, I couldn't follow the logic you laid out because the macro's used
in $3 and $4 start complaining about being invoked multiple times:

configure.ac:95: error: `lib/ldb/ldb.pc' is already registered with
AC_CONFIG_FILES.
autoconf/status.m4:848: AC_CONFIG_FILES is expanded from...
build/m4/public.m4:155: SMB_EXT_LIB_FROM_PKGCONFIG is expanded from...

AS_CASE didn't work, either.

Sam

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