meson: add option to build debugcc as a dynamically linked binary

debugcc is currently linked statically using -static and -static-libgcc.
This can cause issues for distributions that prefer dynamically linked
binaries (e.g. larger binaries and duplicated runtime code which could
otherwise be shared).

Add a Meson boolean option `dynamic-linking` which when enabled removes
the explicit static link flags so that debugcc is built as a dynamically
linked binary using the default toolchain behaviour. The default for this
option is false so that existing builds continue to get a statically
linked binary unless they opt in to dynamic linking.

Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org>

meson.build

@@ -59,7 +59,12 @@ debugcc_srcs += configure_file(
   output: 'platforms.c',
   configuration: platforms)
 
+debugcc_link_args = []
+if not get_option('dynamic-linking')
+  debugcc_link_args += ['-static', '-static-libgcc']
+endif
+
 executable('debugcc',
   debugcc_srcs,
-  link_args: ['-static','-static-libgcc'],
+  link_args: debugcc_link_args,
   install: true)

meson_options.txt

@@ -0,0 +1,5 @@
+option('dynamic-linking',
+  type: 'boolean',
+  value: false,
+  description: 'Build debugcc as a dynamically linked binary instead of static',
+)