From 317a735b07f55f787256592ad7b376998b26234c Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Wed, 23 Mar 2016 21:26:55 +0200
Subject: [PATCH] Error out if using a not found binary in the build. Closes
 #469.

---
 mesonbuild/build.py                          | 2 ++
 test cases/failing/28 noprog use/meson.build | 9 +++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 test cases/failing/28 noprog use/meson.build

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index ab9d0d531..3f480e870 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -842,6 +842,8 @@ class CustomTarget:
             if isinstance(c, str):
                 final_cmd.append(c)
             elif isinstance(c, dependencies.ExternalProgram):
+                if not c.found():
+                    raise InvalidArguments('Tried to use not found external program in a build rule.')
                 final_cmd += c.get_command()
             elif isinstance(c, BuildTarget) or isinstance(c, CustomTarget):
                 self.dependencies.append(c)
diff --git a/test cases/failing/28 noprog use/meson.build b/test cases/failing/28 noprog use/meson.build
new file mode 100644
index 000000000..e4de42fbd
--- /dev/null
+++ b/test cases/failing/28 noprog use/meson.build	
@@ -0,0 +1,9 @@
+project('using not found exe', 'c')
+
+nope = find_program('nonexisting', required : false)
+
+custom_target( 'aa',
+  input: 'meson.build',
+  output: 'foobar',
+  command: [nope, '@INPUT@', '@OUTPUT@']
+)