Migrate the build system to cmake

dependencies/pdf_backend.pri

@@ -1,75 +0,0 @@
-CONFIG(no_pdf) {
-  DEFINES += "NO_PDF"
-}
-
-CONFIG(pdfium) {
-  message(Using pdfium.)
-  DEFINES += "USE_PDFIUM"
-  SOURCES += ../common/pdf_comic.cpp
-  msvc {
-      INCLUDEPATH += $$PWD/pdfium/win/public
-      contains(QMAKE_TARGET.arch, x86_64): {
-          LIBS += -L$$PWD/pdfium/win/x64 -lpdfium
-      } else:contains(QMAKE_TARGET.arch, arm64): {
-          LIBS += -L$$PWD/pdfium/win/arm64 -lpdfium
-      } else {
-          LIBS += -L$$PWD/pdfium/win/x86 -lpdfium
-      }
-  }
-  unix|mingw {
-    macx {
-      LIBS += -L$$PWD/pdfium/macx/bin -lpdfium
-      INCLUDEPATH += $$PWD/pdfium/macx/include
-    }
-    else:!contains(QT_CONFIG, no-pkg-config):packagesExist(libpdfium) {
-      message(Using system provided installation of libpdfium found by pkg-config.)
-      CONFIG += link_pkgconfig
-      PKGCONFIG += libpdfium
-    } else:exists(/usr/include/pdfium) {
-      message(Using libpdfium found at /usr/lib/pdfium)
-      INCLUDEPATH += /usr/include/pdfium
-      LIBS += -lpdfium
-    } else {
-      error(Could not find libpdfium.)
-    }
-  }
-}
-
-CONFIG(pdfkit) {
-  !macx {
-    error (Pdfkit is macOS only)
-  } else {
-    DEFINES += "USE_PDFKIT"
-    OBJECTIVE_SOURCES += ../common/pdf_comic.mm
-  }
-}
-
-CONFIG(poppler) {
-  msvc {
-    contains(QMAKE_TARGET.arch, x86_64): {
-    error ("We currently don't ship precompiled poppler libraries for 64 bit builds on Windows")
-    }
-    INCLUDEPATH += $$PWD/poppler/include/qt6
-    LIBS += -L$$PWD/poppler/lib -lpoppler-qt6
-    # Add extra paths for dll dependencies so the executables don't crash when launching
-    # from QtCreator
-    LIBS += -L$$PWD/poppler/bin
-    LIBS += -L$$PWD/poppler/dependencies/bin
-  }
-  if(unix|mingw):!macx {
-    !contains(QT_CONFIG, no-pkg-config):packagesExist(poppler-qt6) {
-      message("Using system provided installation of poppler-qt6 found by pkg-config.")
-      CONFIG += link_pkgconfig
-      PKGCONFIG += poppler-qt6
-    } else:!macx:exists(/usr/include/poppler/qt6) {
-      message("Using system provided installation of poppler-qt6.")
-      INCLUDEPATH  += /usr/include/poppler/qt6
-      LIBS += -lpoppler-qt6
-    } else {
-      error("Could not find poppler-qt6")
-    }
-  }
-  unix:macx {
-    error (Poppler backend is currently not supported on macOS)
-  }
-}