The option QIODevice::ExistingOnly required Qt 5.11+, option is not required for ReadOnly open.

This is quick fix to resolve problem with ancient Qt libraries
included in older GNU{Linux distributions.

Signed-off-by: Pavel Pisa <[email protected]>

Author: ppisa

qtmips_machine/programloader.cpp

@@ -52,8 +52,8 @@ ProgramLoader::ProgramLoader(QString file) : elf_file(file) {
     // Initialize elf library
     if (elf_version(EV_CURRENT) == EV_NONE)
         throw QTMIPS_EXCEPTION(Input, "Elf library initialization failed", elf_errmsg(-1));
-    // Open source file
-    if (!elf_file.open(QIODevice::ReadOnly | QIODevice::Unbuffered | QIODevice::ExistingOnly))
+    // Open source file - option QIODevice::ExistingOnly cannot be used on Qt <5.11
+    if (!elf_file.open(QIODevice::ReadOnly | QIODevice::Unbuffered))
         throw QTMIPS_EXCEPTION(Input, QString("Can't open input elf file for reading (") + QString(file) + QString(")"), std::strerror(errno));
     // Initialize elf
     if (!(this->elf = elf_begin(elf_file.handle(), ELF_C_READ, NULL)))