Migrate the build system to cmake

compressed_archive/libarchive/README.md

@@ -7,9 +7,9 @@ This backend is currently only supported on the Linux platform.
 
 ## Using
 
-Enabling this backend is achieved by adding the `libarchive` qmake configuration value:
+Enable this backend by setting the `DECOMPRESSION_BACKEND` CMake option:
 
-    qmake CONFIG+=libarchive
+    cmake -B build -DDECOMPRESSION_BACKEND=libarchive
 
 Upon success, the application can be built as normal.
 

compressed_archive/libarchive/libarchive-wrapper.pri

@@ -1,31 +0,0 @@
-INCLUDEPATH += $$PWD
-DEPENDPATH += $$PWD
-
-HEADERS += $$PWD/extract_delegate.h \
-           $$PWD/compressed_archive.h
-
-SOURCES += $$PWD/compressed_archive.cpp
-
-if(mingw|unix):!macx:!contains(QT_CONFIG, no-pkg-config):packagesExist(libarchive) {
-  message(Using system provided libarchive installation found by pkg-config.)
-  !system(pkg-config --atleast-version=3.6.0 libarchive) {
-    LIBARCHIVE_WARNING = "libarchive < 3.6.0 found. Older versions of libarchive DO NOT SUPPORT RARv4 files. This is probably not what you want"
-    warning($$LIBARCHIVE_WARNING)
-    message($$LIBARCHIVE_WARNING)
-  }
-
-  CONFIG += link_pkgconfig
-  PKGCONFIG += libarchive
-  DEFINES += use_libarchive
-  }
-else:unix:!macx:exists(/usr/include/archive.h) {
-  message(Using system provided libarchive installation.)
-  LIBS += -larchive
-  DEFINES += use_libarchive
-}
-else:if(win32|macx) {
-  error(Unsupported: the libarchive decompression backend is not currently supported on this system.)
-}
-else {
-  error(Missing dependency: libarchive decompression backend. Please install libarchive on your system)
-}