[gobject-introspection/wip/meson: 7/23] meson: Fix configuration when libffi is a subproject

[Nirbheek Chauhan <nirbheekc src gnome org>]

commit 8ac55181269e53779f83a3a7a709e1c8b2f1bc4f
Author: Nirbheek Chauhan <nirbheek centricular com>
Date:   Thu Nov 23 13:53:57 2017 +0530

    meson: Fix configuration when libffi is a subproject

 meson.build |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 0fb029a..2573776 100644
--- a/meson.build
+++ b/meson.build
@@ -98,9 +98,16 @@ else
   pkgconfig_conf.set('EXEEXT', '')
 endif
 pkgconfig_conf.set('VERSION', meson.project_version())
-pkgconfig_conf.set('FFI_PC_CFLAGS', libffi_dep.get_pkgconfig_variable('Cflags'))
 pkgconfig_conf.set('FFI_PC_PACKAGES', 'libffi')
-pkgconfig_conf.set('FFI_PC_LIBS', libffi_dep.get_pkgconfig_variable('Libs'))
+if libffi_dep.type_name() == 'pkgconfig'
+  pkgconfig_conf.set('FFI_PC_CFLAGS', libffi_dep.get_pkgconfig_variable('Cflags'))
+  pkgconfig_conf.set('FFI_PC_LIBS', libffi_dep.get_pkgconfig_variable('Libs'))
+else
+  # XXX: We can't know the correct values for these, needs meson API. Maybe we
+  # should use meson's pkgconfig module to generate the whole file.
+  pkgconfig_conf.set('FFI_PC_CFLAGS', '')
+  pkgconfig_conf.set('FFI_PC_LIBS', '-lffi')
+endif
 
 configure_file(
   input: 'gobject-introspection-no-export-1.0.pc.in',