BUG: Correct some of the dependency analysis code.

- Make sure the original link line is untouched
- Avoid duplicating the link line when supporting version < 1.4
- Make sure the cyclic dependencies and such are output correctly in
  complicated cases.
- Avoid outputing dependencies that are already satisfied on the original
  link line when possible.

11 files changed, 93 insertions, 20 deletions

diff --git a/Tests/Dependency/CMakeLists.txt b/Tests/Dependency/CMakeLists.txt
index b7debc6..724f109 100644
--- a/Tests/Dependency/CMakeLists.txt
+++ b/Tests/Dependency/CMakeLists.txt
@@ -3,23 +3,6 @@ PROJECT( Dependency )
 # There is one executable that depends on eight libraries. The
 # system has the following dependency graph:
 #
-#                    +----------- NoDepC  <----  EXECUTABLE ---+
-#                    |                            |    |       |
-#                    V                            |    |       |
-#                                                 |    |       |
-#                  NoDepA  <----- NoDepB  <-------+    |       |
-#                                                      |       |
-#                    ^                                 |       V
-#                    |                                 |
-#      One  <------ Four ----->  Two  <----- Five  <---|----- SixB
-#                                |                     |       |
-#       ^           ^  ^         |  ^         ^        |       |
-#       |           |  +-----+   |   \        |        |       |
-#       |           |        |   |    \       |        |       |
-#       +--------- Three  <------+      --- SixA  <----+       |
-#                            |                                 |
-#                            |                                 |
-#                            +---------------------------------+
 # NoDepA:
 # NoDepB: NoDepA
 # NoDepC: NoDepA
@@ -30,14 +13,20 @@ PROJECT( Dependency )
 # Five: Two
 # SixA: Two Five
 # SixB: Four Five
+# Seven: Two
+# Eight: Seven
+#
 # Exec: NoDepB NoDepC SixA SixB
+# Exec2: Eight Five
+# Exec3: Eight Five
+# Exec4: Five Two
 #
-# The libraries One,...,Five have their dependencies explicitly
+# The libraries One,...,Eight have their dependencies explicitly
 # encoded. The libraries NoDepA,...,NoDepC do not.
 #
 # Although SixB does not depend on Two, there is a dependency listed
 # in the corresponding CMakeLists.txt just because of commands used.
 
 SUBDIRS( NoDepA NoDepB NoDepC )
-SUBDIRS( One Two Three Four Five Six )
-SUBDIRS( Exec )
+SUBDIRS( One Two Three Four Five Six Seven Eight )
+SUBDIRS( Exec Exec2 Exec3 Exec4 )
diff --git a/Tests/Dependency/Eight/CMakeLists.txt b/Tests/Dependency/Eight/CMakeLists.txt
new file mode 100644
index 0000000..5d8e756
--- /dev/null
+++ b/Tests/Dependency/Eight/CMakeLists.txt
@@ -0,0 +1,3 @@
+ADD_LIBRARY( Eight EightSrc.c )
+TARGET_LINK_LIBRARIES( Eight Seven )
+
diff --git a/Tests/Dependency/Eight/EightSrc.c b/Tests/Dependency/Eight/EightSrc.c
new file mode 100644
index 0000000..7bfa481
--- /dev/null
+++ b/Tests/Dependency/Eight/EightSrc.c
@@ -0,0 +1,6 @@
+void SevenFunction();
+
+void EightFunction()
+{
+  SevenFunction();
+}
diff --git a/Tests/Dependency/Exec2/CMakeLists.txt b/Tests/Dependency/Exec2/CMakeLists.txt
new file mode 100644
index 0000000..ee0c74d
--- /dev/null
+++ b/Tests/Dependency/Exec2/CMakeLists.txt
@@ -0,0 +1,12 @@
+# Here, Eight depends on Seven, which has the same dependencies as Five.
+# If the dependencies of Five are emitted, and then we attempt to emit the
+# dependencies of Seven, then we find that they have already been done. So:
+#  Original line:      Eight Five
+#  Add deps of Five:   Eight Five Two ... NoDepA 
+# Now, we must make sure that Seven gets inserted between Five and Two, and
+# not at the end. Unfortunately, if we get it wrong, the test will only
+# fail on a platform where the link order makes a difference.
+LINK_LIBRARIES( Eight Five )
+
+ADD_EXECUTABLE( exec2 ExecMain.c )
+
diff --git a/Tests/Dependency/Exec2/ExecMain.c b/Tests/Dependency/Exec2/ExecMain.c
new file mode 100644
index 0000000..d08a796
--- /dev/null
+++ b/Tests/Dependency/Exec2/ExecMain.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+void FiveFunction();
+void EightFunction();
+
+int main( )
+{
+  FiveFunction();
+  EightFunction();
+
+  printf("Dependency test executable ran successfully.\n");
+
+  return 0;
+}
diff --git a/Tests/Dependency/Exec3/CMakeLists.txt b/Tests/Dependency/Exec3/CMakeLists.txt
new file mode 100644
index 0000000..b33e732
--- /dev/null
+++ b/Tests/Dependency/Exec3/CMakeLists.txt
@@ -0,0 +1,6 @@
+# Here, Five already has it's immediate dependency, Two satisfied. We must
+# make sure Two gets output anyway, because Eight indirectly depends on it.
+LINK_LIBRARIES( Five Two Eight Five )
+
+ADD_EXECUTABLE( exec3 ExecMain.c )
+
diff --git a/Tests/Dependency/Exec3/ExecMain.c b/Tests/Dependency/Exec3/ExecMain.c
new file mode 100644
index 0000000..d08a796
--- /dev/null
+++ b/Tests/Dependency/Exec3/ExecMain.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+void FiveFunction();
+void EightFunction();
+
+int main( )
+{
+  FiveFunction();
+  EightFunction();
+
+  printf("Dependency test executable ran successfully.\n");
+
+  return 0;
+}
diff --git a/Tests/Dependency/Exec4/CMakeLists.txt b/Tests/Dependency/Exec4/CMakeLists.txt
new file mode 100644
index 0000000..6fcb153
--- /dev/null
+++ b/Tests/Dependency/Exec4/CMakeLists.txt
@@ -0,0 +1,6 @@
+# Even though Five's dependency on Two is explicitly satisfied, Two
+# must be emitted again in order to satisfy a cyclic dependency on Three.
+LINK_LIBRARIES( Five Two Five )
+
+ADD_EXECUTABLE( exec4 ExecMain.c )
+
diff --git a/Tests/Dependency/Exec4/ExecMain.c b/Tests/Dependency/Exec4/ExecMain.c
new file mode 100644
index 0000000..3f53573
--- /dev/null
+++ b/Tests/Dependency/Exec4/ExecMain.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+void FiveFunction();
+void TwoFunction();
+
+int main( )
+{
+  FiveFunction();
+  TwoFunction();
+
+  printf("Dependency test executable ran successfully.\n");
+
+  return 0;
+}
diff --git a/Tests/Dependency/Seven/CMakeLists.txt b/Tests/Dependency/Seven/CMakeLists.txt
new file mode 100644
index 0000000..51a38d8
--- /dev/null
+++ b/Tests/Dependency/Seven/CMakeLists.txt
@@ -0,0 +1,3 @@
+ADD_LIBRARY( Seven SevenSrc.c )
+TARGET_LINK_LIBRARIES( Seven Two )
+
diff --git a/Tests/Dependency/Seven/SevenSrc.c b/Tests/Dependency/Seven/SevenSrc.c
new file mode 100644
index 0000000..e1f3329
--- /dev/null
+++ b/Tests/Dependency/Seven/SevenSrc.c
@@ -0,0 +1,6 @@
+void TwoFunction();
+
+void SevenFunction()
+{
+  TwoFunction();
+}