Tweak specs to all pass cleanly on MacOS

build_tests/library/Rsconscript

@@ -1,4 +1,7 @@
 env(echo: :command) do |env|
-  env.Program('library.exe', ['lib.a', 'three.c'])
-  env.Library("lib.a", ['one.c', 'two.c'], 'CPPFLAGS' => ['-Dmake_lib'])
+  env["LIBS"] << "mylib"
+  env["LIBPATH"] << "."
+  env.Program("library.exe", "one.c")
+  env.depends("library.exe", "libmylib.a")
+  env.Library("libmylib.a", ["two.c", "three.c"], "CPPFLAGS" => ["-Dmake_lib"])
 end

build_tests/library/one.c

@@ -1,8 +1,11 @@
 #include <stdio.h>
 
-#ifdef make_lib
+void two();
+void three();
+
 int main(int argc, char *argv[])
 {
+    two();
     printf("Library\n");
+    three();
 }
-#endif

build_tests/library/override_arcmd.rb

@@ -1,4 +1,4 @@
 env(echo: :command) do |env|
-  env["ARCMD"] = %w[ar rcf ${_TARGET} ${_SOURCES}]
+  env["ARCMD"] = %w[ar rcsu ${_TARGET} ${_SOURCES}]
   env.Library("lib.a", glob("*.c"))
 end

build_tests/library/three.c

@@ -0,0 +1,3 @@
+void three(void)
+{
+}

build_tests/library/two.c

@@ -0,0 +1,3 @@
+void two(void)
+{
+}

build_tests/simple/link_flag_change.rb

@@ -1,5 +1,6 @@
 env(echo: :command) do |env|
   env["LD"] = "gcc"
+  mkdir_p("libdir")
   env["LIBPATH"] += ["libdir"]
   env.Program('simple.exe', Dir['*.c'])
 end

build_tests/two_sources/two.c

@@ -1,3 +1,6 @@
 #ifdef ONE
 #error ONE should not be defined
 #endif
+void two(void)
+{
+}