QbsProjectManager: Set cpp.compilerPathByLanguage.

To work around the "-x" bug in icecream.

Change-Id: I7d95aa120ad344f6662c265fe81ab98752c7cd1e
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp

@@ -36,6 +36,7 @@
 #include <projectexplorer/toolchain.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <qtsupport/baseqtversion.h>
+#include <utils/hostosinfo.h>
 #include <utils/qtcassert.h>
 
 #include <qbs.h>
@@ -231,6 +232,29 @@ QVariantMap DefaultPropertyProvider::autoGeneratedProperties(const ProjectExplor
         data.insert(QLatin1String(CPP_LINKERNAME), compilerName);
     }
     data.insert(QLatin1String(CPP_TOOLCHAINPATH), cxxFileInfo.absolutePath());
+
+    QVariantMap m;
+    if (toolchain.contains(QLatin1String("clang"))) {
+        m[QLatin1String("c")] = m[QLatin1String("objc")] = QLatin1String("clang");
+        m[QLatin1String("cpp")] = m[QLatin1String("objcpp")] = QLatin1String("clang++");
+    } else if (toolchain.contains(QLatin1String("gcc"))) {
+        m[QLatin1String("c")] = m[QLatin1String("objc")] = QLatin1String("gcc");
+        m[QLatin1String("cpp")] = m[QLatin1String("objcpp")] = QLatin1String("g++");
+    }
+    const QString fullPrefix = cxxFileInfo.absolutePath() + QLatin1Char('/') + toolchainPrefix;
+    for (auto it = m.begin(); it != m.end();) {
+        const QString filePath = Utils::HostOsInfo::withExecutableSuffix(fullPrefix
+                                                                         + it.value().toString());
+        if (QFile::exists(filePath)) {
+            it.value() = filePath;
+            ++it;
+        } else {
+            it = m.erase(it);
+        }
+    }
+    if (!m.isEmpty())
+        data.insert(QLatin1String(CPP_COMPILERPATHBYLANGUAGE), m);
+
     if (targetAbi.osFlavor() == ProjectExplorer::Abi::WindowsMsvc2013Flavor) {
         const QLatin1String flags("/FS");
         data.insert(QLatin1String(CPP_PLATFORMCFLAGS), flags);

src/plugins/qbsprojectmanager/qbsconstants.h

@@ -41,6 +41,7 @@ const char QBS_ARCHITECTURE[] = "qbs.architecture";
 const char QBS_ENDIANNESS[] = "qbs.endianness";
 const char QBS_TOOLCHAIN[] = "qbs.toolchain";
 const char CPP_TOOLCHAINPATH[] = "cpp.toolchainInstallPath";
+const char CPP_COMPILERPATHBYLANGUAGE[] = "cpp.compilerPathByLanguage";
 const char CPP_TOOLCHAINPREFIX[] = "cpp.toolchainPrefix";
 const char CPP_COMPILERNAME[] = "cpp.compilerName";
 const char CPP_LINKERNAME[] = "cpp.linkerName";