Add Configure-Time Tests for gperf, flex and bison

Configure-Time tests for presence of (required) gperf, bison and flex
are added to configure.pri and configure.json, so that we can decide
early on to skip the build, instead of starting a build that
will fail much later, yield incomprehensible error messages and
make the build of the complete Qt framework fail.

Task-number: QTBUG-52805
Change-Id: I7dab49e6e8672b72901519ad7d88de97197fe587
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 30 insertions, 0 deletions

diff --git a/configure.pri b/configure.pri
index ce36642bb..2d6983354 100644
--- a/configure.pri
+++ b/configure.pri
@@ -41,6 +41,36 @@ defineTest(qtConfTest_detectPython2) {
     return(true)
 }
 
+defineTest(qtConfTest_detectGperf) {
+    gperf = $$qtConfFindInPath("gperf$$EXE_SUFFIX")
+    isEmpty(gperf) {
+        qtLog("Required gperf could not be found.")
+        return(false)
+    }
+    qtLog("Found gperf from path: $$gperf")
+    return(true)
+}
+
+defineTest(qtConfTest_detectBison) {
+    bison = $$qtConfFindInPath("bison$$EXE_SUFFIX")
+    isEmpty(bison) {
+        qtLog("Required bison could not be found.")
+        return(false)
+    }
+    qtLog("Found bison from path: $$bison")
+    return(true)
+}
+
+defineTest(qtConfTest_detectFlex) {
+    flex = $$qtConfFindInPath("flex$$EXE_SUFFIX")
+    isEmpty(flex) {
+        qtLog("Required flex could not be found.")
+        return(false)
+    }
+    qtLog("Found flex from path: $$flex")
+    return(true)
+}
+
 defineTest(qtConfTest_detectNinja) {
     ninja = $$qtConfFindInPath("ninja$$EXE_SUFFIX")
     !isEmpty(ninja) {