run dep commands in build dir

the file names are given relative to the build directory, so the command
needs to be run in it as well. this is a more expected (and simpler) fix
than the alternative, which would be giving file names relative to the
source directory.

reasons not to fix:
- due to some other bug, the problem really affects only builds where
  the build dir is not at the same level as the source dir - otherwise,
  absolute paths would be passed anyway
- it has some breakage potential for the cases where the commands
  actually expect being run in the source dir
- it can be worked around by manually injecting the cd statement into
  the command

reasons why i still fixed it:
- it doesn't affect in-source builds, and it seems that most complex
  build systems (which would define custom compilers with
  depend_command) don't support shadow builds anyway
- people who needed things to work probably already used $$OUT_PWD somehow
  (either a "cd" at the start, or prepending it to each path), so this
  change will be practically a no-op
- "it's just dependencies, and these are known to be broken in qmake
  anyway"

Reviewed-by: joerg
Task-number: QTBUG-1918

3 files changed, 7 insertions, 0 deletions

diff --git a/tests/auto/qmake/testdata/simple_app/build/README b/tests/auto/qmake/testdata/simple_app/build/README
new file mode 100644
index 0000000000..acfd9d9226
--- /dev/null
+++ b/tests/auto/qmake/testdata/simple_app/build/README
@@ -0,0 +1 @@
+Here to ensure build/ exists, used by the simple_app_shadowbuild2 test.
diff --git a/tests/auto/qmake/testdata/simple_app/simple_app.pro b/tests/auto/qmake/testdata/simple_app/simple_app.pro
index f496d5bb8e..a8c4ad613d 100644
--- a/tests/auto/qmake/testdata/simple_app/simple_app.pro
+++ b/tests/auto/qmake/testdata/simple_app/simple_app.pro
@@ -3,6 +3,7 @@ CONFIG		+= qt warn_on
 HEADERS		= test_file.h
 SOURCES		= test_file.cpp \
 		  	main.cpp
+RESOURCES = test.qrc
 TARGET		= simple_app
 DESTDIR		= ./
 
diff --git a/tests/auto/qmake/testdata/simple_app/test.qrc b/tests/auto/qmake/testdata/simple_app/test.qrc
new file mode 100644
index 0000000000..decde3dd24
--- /dev/null
+++ b/tests/auto/qmake/testdata/simple_app/test.qrc
@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>test.qrc</file>
+    </qresource>
+</RCC>