tools: add -Dagent=true option

This also builds the agent statically with libsysprof_static_dep since
we'd need that to avoid installing libsysprof when that isn't wanted.
It also ensures the LD_PRELOAD libraries are installed for use by the
agent.

meson_options.txt

@@ -44,3 +44,7 @@ option('tests', type: 'boolean')
 # Optionally disable the examples (this is mostly only useful for building only
 # libsysprof-capture as a subproject)
 option('examples', type: 'boolean')
+
+# Optionally build the sysprof-agent tool to allow profiling inside of
+# containers from external system
+option('agent', type: 'boolean', description: 'Build the sysprof-agent utility')

src/libsysprof/meson.build

@@ -166,6 +166,7 @@ libsysprof_static_dep = declare_dependency(
    include_directories: [include_directories('.'), libsysprof_capture_include_dirs],
 )
 
+if get_option('libsysprof')
 libsysprof = shared_library('sysprof-@0@'.format(libsysprof_api_version),
            dependencies: libsysprof_deps + [libsysprof_static_dep],
                 install: true,
@@ -191,5 +192,6 @@ pkgconfig.generate(
 )
 
 install_headers(libsysprof_public_headers, subdir: sysprof_header_subdir)
+endif
 
 subdir('preload')

src/meson.build

@@ -58,7 +58,7 @@ subdir('libsysprof-capture')
 if get_option('sysprofd') == 'bundled'
   subdir('sysprofd')
 endif
-if get_option('libsysprof')
+if get_option('libsysprof') or get_option('agent')
   subdir('libsysprof')
 endif
 if get_option('gtk') and get_option('libsysprof')

src/tools/meson.build

@@ -12,14 +12,6 @@ if get_option('libsysprof')
      install_dir: get_option('bindir'),
          install: true,
   )
-
-  sysprof_agent = executable('sysprof-agent',
-    ['sysprof-agent.c', ipc_agent_src],
-    dependencies: [libsysprof_dep],
-          c_args: tools_cflags,
-     install_dir: get_option('bindir'),
-         install: true,
-  )
 endif
 
 sysprof_cat = executable('sysprof-cat', 'sysprof-cat.c',
@@ -48,3 +40,13 @@ list_threads = executable('list-threads', ['list-threads.c'],
         c_args: tools_cflags,
        install: false,
 )
+
+if get_option('agent')
+  sysprof_agent = executable('sysprof-agent',
+    ['sysprof-agent.c', ipc_agent_src],
+    dependencies: [libsysprof_static_dep],
+          c_args: tools_cflags,
+     install_dir: get_option('bindir'),
+         install: true,
+  )
+endif