[Buildroot] [PATCH] package/nmap: fix shared-only build

[Peter Korsgaard <peter@korsgaard.com>]

>>>>> "Yann" == Yann E MORIN <yann.morin.1998@free.fr> writes:

 > Changeset f1d3e09 (Build shared libraries only as the default) broke the
 > nmap package.

 > nmap builds an internal version of libdnet, and tries to statically link
 > against it. Of course, this breaks for shared-only builds, since in that
 > case there is no static lib ever built.

 > Using an external libdnet is not really an option:

 >   - libdnet comes from dnprogs, from the linux-decnet project;
 >     unfortunately, their build-system is not ammenable to
 >     cross-compilation, and is a real pain to deal with;

 >   - nmap's bundled libdnet is anyway heavily modified, which precludes
 >     using an external libdnet.

 > Fix that by considering libdnet to be a purely internal library, and by
 > configuring it with --enable-static, always.

 > nmap's ./configure uses AC_CONFIG_SUBDIRS() to configure the libdnet
 > sub-directory; AC_CONFIG_SUBDIRS() calls ./configure in all the
 > sub-directories it is passed as arguments. Unfortunately, it is not
 > possible to specify extra ./configure arguments whith AC_CONFIG_SUBDIRS.

 > We are using an autoconf trick, which is, when configuring
 > sub-directories with AC_CONFIG_SUBDIRS(), it will first try to execute
 > configure.gnu if it exists, before it fallbacks to running plain
 > configure. See:
 >     https://www.gnu.org/software/autoconf/manual/autoconf.html#Subdirectories

 > So, we provide a configure.gnu that is just a wrapper around the real
 > configure, which sole purpose is to append --enable-static when calling
 > the real configure.

 > Note1: since this libdnet is considered a purely internal library, we
 > also always pass --disable-shared, since it is not needed at all.

 > Note2: since this libdnet is considered a purely internal library, it
 > should not be exposed to other packages, and thus nmap does not install
 > it, neither in target nor in staging, neither static nor shared, which
 > is what we want.

 > Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
 > Cc: Romain Naour <romain.naour@openwide.fr>
 > ---
 >  package/nmap/0001-libdnet-wrapper-configure.patch | 11 +++++++++++
 >  package/nmap/nmap.mk                              |  5 +++++
 >  2 files changed, 16 insertions(+)
 >  create mode 100644 package/nmap/0001-libdnet-wrapper-configure.patch

 > +++ b/package/nmap/nmap.mk
 > @@ -14,6 +14,11 @@ NMAP_CONF_OPTS = --without-liblua --without-zenmap \
 >  NMAP_LICENSE = GPLv2
 >  NMAP_LICENSE_FILES = COPYING
 
I added a comment explaining why we're doing this. It would be nice if
patch / apply-patches.sh would learn the git permissions / rename
handling extensions.

Committed with this and the typo pointed out by Romain fixed, thanks.
-- 
Bye, Peter Korsgaard