qmake: Suppress built-in suffixes for make

They cause make to run much slower, and qmake writes everything explicitly, so they're not really needed. Change-Id: Ia47674eec8309e120c8264b7b6687677a520d5b9 Reviewed-by: Qt CI Bot <[email protected]> Reviewed-by: Jörg Bornemann <[email protected]>
leadtobetter · Mar 31, 2022 · 48ef124 · 48ef124
1 parent 4114a0e
commit 48ef124
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diff --git a/qmake/generators/makefile.cpp b/qmake/generators/makefile.cpp
@@ -2243,6 +2243,7 @@ MakefileGenerator::writeDummyMakefile(QTextStream &t)
       << "@echo \"Skipped.\"\n\n";
     writeMakeQmake(t);
     t << "FORCE:\n\n";
+    suppressBuiltinRules(t);
     return true;
 }
 
@@ -2257,6 +2258,7 @@ MakefileGenerator::writeMakefile(QTextStream &t)
     writeInstalls(t);
 
     t << "FORCE:\n\n";
+    suppressBuiltinRules(t);
     return true;
 }
 
@@ -2778,6 +2780,13 @@ MakefileGenerator::writeSubTargets(QTextStream &t, QList<MakefileGenerator::SubT
         writeInstalls(t, true);
     }
     t << "FORCE:\n\n";
+    suppressBuiltinRules(t);
+}
+
+void
+MakefileGenerator::suppressBuiltinRules(QTextStream &t) const
+{
+    t << ".SUFFIXES:\n\n";
 }
 
 void

diff --git a/qmake/generators/makefile.h b/qmake/generators/makefile.h
@@ -121,6 +121,7 @@ class MakefileGenerator : protected QMakeSourceFileInfo
     void writeSubTargetCall(QTextStream &t,
             const QString &in_directory, const QString &in, const QString &out_directory, const QString &out,
             const QString &out_directory_cdin, const QString &makefilein);
+    virtual void suppressBuiltinRules(QTextStream &t) const;
     virtual void writeSubMakeCall(QTextStream &t, const QString &outDirectory_cdin,
                                   const QString &makeFileIn);
     virtual void writeSubTargets(QTextStream &t, QList<SubTarget*> subtargets, int flags);

diff --git a/qmake/generators/win32/msvc_nmake.cpp b/qmake/generators/win32/msvc_nmake.cpp
@@ -174,6 +174,10 @@ QString NmakeMakefileGenerator::var(const ProKey &value) const
     return MakefileGenerator::var(value);
 }
 
+void NmakeMakefileGenerator::suppressBuiltinRules(QTextStream &t) const
+{
+}
+
 void NmakeMakefileGenerator::init()
 {
     /* this should probably not be here, but I'm using it to wrap the .t files */

diff --git a/qmake/generators/win32/msvc_nmake.h b/qmake/generators/win32/msvc_nmake.h
@@ -52,6 +52,7 @@ class NmakeMakefileGenerator : public Win32MakefileGenerator
     QString defaultInstall(const QString &t) override;
     QStringList &findDependencies(const QString &file) override;
     QString var(const ProKey &value) const override;
+    void suppressBuiltinRules(QTextStream &t) const override;
     QString precompH, precompObj, precompPch;
     QString precompObjC, precompPchC;
     bool usePCH = false;