Avoid undeclared variable

talisein · talisein · commit 254a3f06fdae · 2022-06-15T09:54:48.000-07:00
If libxmlpp is a subproject, ahd the main project included a libxml2 wrap, then
xml2_dep.type_name() is internal, but libxml2_lib is not set.
diff --git a/meson.build b/meson.build
@@ -106,8 +106,10 @@ xml2_min_ver = '2.7.7'
 xml2_req = '>= @0@'.format(xml2_min_ver)
 xml2_dep = dependency('libxml-2.0', version: xml2_req, required: host_machine.system() != 'windows')
 
+libxml2_lib_set = false
 if not xml2_dep.found()
   libxml2_lib = 'libxml2'
+  libxml2_lib_set = true
   xml2_dep =  cpp_compiler.find_library(libxml2_lib,
                                         has_headers: [
                                           'libxml/globals.h',
@@ -152,7 +154,9 @@ libxml2_lib_pkgconfig = ''
 if xml2_dep.type_name() == 'pkgconfig'
   xmlxx_requires += ['libxml-2.0', xml2_req]
 else
-  libxml2_lib_pkgconfig = '-l@0@'.format(libxml2_lib)
+  if libxml2_lib_set
+    libxml2_lib_pkgconfig = '-l@0@'.format(libxml2_lib)
+  endif
 endif
 
 xmlxx_requires = ' '.join(xmlxx_requires)
