Add a test case for very long command lines

This exercises commands of about 20K in length

Also test short commandlines to make sure they don't regress.

test cases/common/234 very long commmand line/codegen.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+
+import sys
+
+with open(sys.argv[2], 'w') as f:
+    print('int func{n}(void) {{ return {n}; }}'.format(n=sys.argv[1]), file=f)

test cases/common/234 very long commmand line/main.c

@@ -0,0 +1,5 @@
+int main(int argc, char **argv) {
+  (void) argc;
+  (void) argv;
+  return 0;
+}

test cases/common/234 very long commmand line/meson.build

@@ -0,0 +1,21 @@
+project('very long command lines', 'c')
+
+seq = run_command('seq.py', '1', '256').stdout().strip().split('\n')
+
+sources = []
+codegen = find_program('codegen.py')
+
+foreach i : seq
+  sources += custom_target('codegen' + i,
+                           command: [codegen, i, '@OUTPUT@'],
+                           output: 'test' + i + '.c')
+endforeach
+
+shared_library('sharedlib', sources)
+static_library('staticlib', sources)
+executable('app', 'main.c', sources)
+
+# Also test short commandlines to make sure that doesn't regress
+shared_library('sharedlib0', sources[0])
+static_library('staticlib0', sources[0])
+executable('app0', 'main.c', sources[0])

test cases/common/234 very long commmand line/seq.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+
+import sys
+
+for i in range(int(sys.argv[1]), int(sys.argv[2])):
+    print(i)