meson: Make dlopen=all the default

As of earlier commit, all dependencies can be dlopen'd on demand. Do
that for all optional libraries by default, but still allow it to be
overridden during build.

Example numbers/benefits taken from `modprobe --show-depends nouveau`:

 - fewer instr - 50% reduction, 1.2M -> 0.5M
 - less memory use - Rss by ~33%, 3M -> 2M
 - reduced attack surface

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/420
Signed-off-by: Lucas De Marchi <demarchi@kernel.org>

diff --git a/README.md b/README.md
index 2f11d09f2e5e69f333922180958c571fc57618d7..a5ef3d3d877ec02baa49aba39d9e4be420ed8913 100644 (file)
--- a/README.md
+++ b/README.md
@@ -48,7 +48,8 @@ Optional dependencies, required with the default build configuration:
 - ZSTD library
 - OPENSSL library (signature handling in modinfo)
 
-Typical configuration and installation
+All the optional dependencies are loaded on demand via `dlopen` by default. This can
+be changed via the `dlopen` build option. Typical configuration and installation:
 
     meson setup builddir/
     meson compile -C builddir/

diff --git a/meson_options.txt b/meson_options.txt
index 9fc5b56486f8b8e4c0b25d1e4b3a22230c645a3b..9c215f50da0f54070b2aa0e5dd139db931e797ee 100644 (file)
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -71,8 +71,8 @@ option(
   'dlopen',
   type : 'array',
   choices : ['zstd', 'xz', 'zlib', 'openssl', 'all'],
-  value : [],
-  description : 'Libraries to dlopen rather than linking. Use \'all\' to . Default: none',
+  value : ['all'],
+  description : 'Libraries to dlopen rather than linking. Default: "all"',
 )
 
 option(