GCC: avoid duplicating objects in linker command line

Long command lines are especially a problem when building statically in
MXE. This commit tries to replicate the logic employed by qmake, where
before adding a new object to the command line, all of its previous
appearences get removed.

Fixes: QBS-1273
Change-Id: I51c843c4a7cfc170ed4fab30deae6c4229690dd0
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/auto/blackbox/testdata/remove-duplicate-libs/remove-duplicate-libs.qbs b/tests/auto/blackbox/testdata/remove-duplicate-libs/remove-duplicate-libs.qbs
new file mode 100644
index 000000000..4ffb8d0e2
--- /dev/null
+++ b/tests/auto/blackbox/testdata/remove-duplicate-libs/remove-duplicate-libs.qbs
@@ -0,0 +1,26 @@
+import "MyStaticLib.qbs" as MyStaticLib
+
+Project {
+    property bool removeDuplicates
+    property string libDir: buildDirectory + "/lib"
+    property bool dummy: {
+        console.info("is bfd linker: "
+                     + (qbs.toolchain.contains("gcc") && !qbs.hostOS.contains("macos")))
+    }
+
+    qbsSearchPaths: "."
+    MyStaticLib { name: "requestor1" }
+    MyStaticLib { name: "requestor2"  }
+    MyStaticLib { name: "provider"; Group { files: "provider2.c" } }
+
+    CppApplication {
+        consoleApplication: true
+        Depends { name: "requestor1"; cpp.link: false }
+        Depends { name: "requestor2"; cpp.link: false }
+        Depends { name: "provider"; cpp.link: false }
+        cpp.libraryPaths: project.libDir
+        cpp.removeDuplicateLibraries: project.removeDuplicates
+        cpp.staticLibraries: ["requestor1", "requestor2", "provider", "requestor2"]
+        files: "main.c"
+    }
+}