Example of finding shared library paths with ldd in configuration tests

playground/libtest/wscript

@@ -0,0 +1,53 @@
+#! /usr/bin/env python
+
+def options(opt):
+	opt.load('compiler_c')
+
+def configure(conf):
+	conf.load('compiler_c')
+	conf.find_program('ldd')
+	conf.where_is_shlib(lib='m')
+
+# --- support code below ---
+
+import re
+from waflib import Task, TaskGen, Configure
+
+class ldd_run(Task.Task):
+	color = 'PINK'
+	run_str = '${LDD} ${SRC} > ${TGT}'
+
+	def post_run(self):
+		ret = Task.Task.post_run(self)
+		libname = self.generator.lib
+		re_libpath = re.compile('lib%s.*\s+=>\s+(\S+%s\S+)\s+' % (libname, libname), re.M)
+		m = re_libpath.search(self.outputs[0].read())
+		if m:
+			self.generator.tmp.append(m.group(1))
+		else:
+			return ret or 1
+		return ret
+
+@TaskGen.feature('ldd_check')
+@TaskGen.after_method('apply_link')
+def do_ldd_check(self):
+	self.create_task('ldd_run', self.link_task.outputs[0], self.path.find_or_declare('ldd.out'))
+
+@Configure.conf
+def where_is_shlib(self, lib):
+	tmp = []
+	def check_msg(self):
+		return tmp[0]
+
+	self.check(
+		fragment  = 'int main() { return 0; }\n',
+		features  = 'c cprogram ldd_check',
+		lib       = lib,
+		linkflags = '-Wl,--no-as-needed',
+		msg       = 'Where is library %r' % lib,
+		define    = 'LIBFROM',
+		tmp       = tmp,
+		okmsg     = check_msg)
+
+	return tmp[0]
+