Fix dependency resolution for extra compilers in VS projects

De-duplicate the code that calls the extra compiler's depend_command by
using the central function callExtraCompilerDependCommand. This one
actually tries to resolve dependencies unlike the removed code that
blindly resolved relative paths to the build directory.

This fixes dependencies reported by uic which need to be resolved
against what is in DEPENDPATH.

Fixes: QTBUG-80579
Change-Id: If482e50ff3eff716fefffee82004acc076b3a547
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
(cherry picked from commit 9d7ed92f6e63cd2d1a1388874e54b37b5cfd01b7)
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

4 files changed, 17 insertions, 29 deletions

diff --git a/qmake/generators/makefile.cpp b/qmake/generators/makefile.cpp
index b0075ae66c..d9b99b21fd 100644
--- a/qmake/generators/makefile.cpp
+++ b/qmake/generators/makefile.cpp
@@ -1877,10 +1877,13 @@ void MakefileGenerator::callExtraCompilerDependCommand(const ProString &extraCom
                                                        const QString &tmp_out,
                                                        bool dep_lines,
                                                        QStringList *deps,
-                                                       bool existingDepsOnly)
+                                                       bool existingDepsOnly,
+                                                       bool checkCommandAvailability)
 {
     char buff[256];
     QString dep_cmd = replaceExtraCompilerVariables(tmp_dep_cmd, inpf, tmp_out, LocalShell);
+    if (checkCommandAvailability && !canExecute(dep_cmd))
+        return;
     dep_cmd = dep_cd_cmd + fixEnvVariables(dep_cmd);
     if (FILE *proc = QT_POPEN(dep_cmd.toLatin1().constData(), QT_POPEN_READ)) {
         QByteArray depData;
diff --git a/qmake/generators/makefile.h b/qmake/generators/makefile.h
index fe77ea0e74..edb9a80ef1 100644
--- a/qmake/generators/makefile.h
+++ b/qmake/generators/makefile.h
@@ -87,7 +87,8 @@ protected:
     void callExtraCompilerDependCommand(const ProString &extraCompiler, const QString &dep_cd_cmd,
                                         const QString &tmp_dep_cmd, const QString &inpf,
                                         const QString &tmp_out, bool dep_lines, QStringList *deps,
-                                        bool existingDepsOnly);
+                                        bool existingDepsOnly,
+                                        bool checkCommandAvailability = false);
     void writeExtraCompilerTargets(QTextStream &t);
     void writeExtraCompilerVariables(QTextStream &t);
     bool writeDummyMakefile(QTextStream &t);
diff --git a/qmake/generators/win32/msvc_objectmodel.cpp b/qmake/generators/win32/msvc_objectmodel.cpp
index 4c7ad4b291..574b842684 100644
--- a/qmake/generators/win32/msvc_objectmodel.cpp
+++ b/qmake/generators/win32/msvc_objectmodel.cpp
@@ -2350,33 +2350,15 @@ bool VCFilter::addExtraCompiler(const VCFilterFile &info)
         if (!tmp_dep.isEmpty())
             deps = tmp_dep;
         if (!tmp_dep_cmd.isEmpty()) {
-            // Execute dependency command, and add every line as a dep
-            char buff[256];
-            QString dep_cmd = Project->replaceExtraCompilerVariables(
-                        tmp_dep_cmd, inFile, out, MakefileGenerator::LocalShell);
-            if(Project->canExecute(dep_cmd)) {
-                dep_cmd.prepend(QLatin1String("cd ")
-                                + IoUtils::shellQuote(Option::fixPathToLocalOS(Option::output_dir, false))
-                                + QLatin1String(" && "));
-                if (FILE *proc = QT_POPEN(dep_cmd.toLatin1().constData(), QT_POPEN_READ)) {
-                    QString indeps;
-                    while(!feof(proc)) {
-                        int read_in = (int)fread(buff, 1, 255, proc);
-                        if(!read_in)
-                            break;
-                        indeps += QByteArray(buff, read_in);
-                    }
-                    QT_PCLOSE(proc);
-                    if(!indeps.isEmpty()) {
-                        QStringList extradeps = indeps.split(QLatin1Char('\n'));
-                        for (int i = 0; i < extradeps.count(); ++i) {
-                            QString dd = extradeps.at(i).simplified();
-                            if (!dd.isEmpty())
-                                deps += Project->fileFixify(dd, MakefileGenerator::FileFixifyFromOutdir);
-                        }
-                    }
-                }
-            }
+            const QString dep_cd_cmd = QLatin1String("cd ")
+                    + IoUtils::shellQuote(Option::fixPathToLocalOS(Option::output_dir, false))
+                    + QLatin1String(" && ");
+            Project->callExtraCompilerDependCommand(extraCompilerName, dep_cd_cmd, tmp_dep_cmd,
+                                                    inFile, out,
+                                                    true, // dep_lines
+                                                    &deps,
+                                                    configs.contains("dep_existing_only"),
+                                                    true  /* checkCommandAvailability */);
         }
         for (int i = 0; i < deps.count(); ++i)
             deps[i] = Option::fixPathToTargetOS(
diff --git a/qmake/generators/win32/msvc_vcproj.h b/qmake/generators/win32/msvc_vcproj.h
index e87eb733fc..04bc6ba74c 100644
--- a/qmake/generators/win32/msvc_vcproj.h
+++ b/qmake/generators/win32/msvc_vcproj.h
@@ -68,6 +68,8 @@ public:
     bool usePCH;
     VCProjectWriter *projectWriter;
 
+    using Win32MakefileGenerator::callExtraCompilerDependCommand;
+
 protected:
     virtual VCProjectWriter *createProjectWriter();
     bool doDepends() const override { return false; } // Never necessary