Add depfile to configure_file()

In qemu, minikconf generates a depfile that meson could use to
automatically reconfigure on dependency change.

Note: someone clever can perhaps find a way to express this with a
ninja rule & depfile=. I didn't manage, so I wrote a simple depfile
parser.

3 files changed, 30 insertions, 0 deletions

diff --git a/test cases/common/14 configure file/depfile b/test cases/common/14 configure file/depfile
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test cases/common/14 configure file/depfile
diff --git a/test cases/common/14 configure file/generator-deps.py b/test cases/common/14 configure file/generator-deps.py
new file mode 100755
index 0000000..376ddb2
--- /dev/null
+++ b/test cases/common/14 configure file/generator-deps.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+import sys, os
+from pathlib import Path
+
+if len(sys.argv) != 3:
+    print("Wrong amount of parameters.")
+
+build_dir = Path(os.environ['MESON_BUILD_ROOT'])
+subdir = Path(os.environ['MESON_SUBDIR'])
+outputf = Path(sys.argv[1])
+
+with outputf.open('w') as ofile:
+    ofile.write("#define ZERO_RESULT 0\n")
+
+depf = Path(sys.argv[2])
+if not depf.exists():
+    with depf.open('w') as ofile:
+        ofile.write("{}: depfile\n".format(outputf.name))
diff --git a/test cases/common/14 configure file/meson.build b/test cases/common/14 configure file/meson.build
index d0f3d54..4a2f15a 100644
--- a/test cases/common/14 configure file/meson.build
+++ b/test cases/common/14 configure file/meson.build
@@ -57,6 +57,17 @@ if ret.returncode() != 0
   error('Error running command: @0@\n@1@'.format(ret.stdout(), ret.stderr()))
 endif
 
+genscript2deps = '@0@/generator-deps.py'.format(meson.current_source_dir())
+ofile2deps = '@0@/config2deps.h'.format(meson.current_build_dir())
+outf = configure_file(
+  output : 'config2deps.h',
+  depfile : 'depfile.d',
+  command : [genprog, genscript2deps, ofile2deps, '@DEPFILE@'])
+ret = run_command(check_file, outf)
+if ret.returncode() != 0
+  error('Error running command: @0@\n@1@'.format(ret.stdout(), ret.stderr()))
+endif
+
 found_script = find_program('generator.py')
 # More configure_file tests in here
 subdir('subdir')