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Created attachment 277179 [details] Thread dump I've selected project Properties->C/C++ Build->Tool Chain Editor->Current builder: "CDT Internal builder" (and by the way I have "Enable parallel build" with "Use optimal jobs (4)" enabled; the compiler is Msys64 MinGW). Then I start "Build project", then push square red button "Cancel operation" on "Progress" tab, then "Build project" again; after that the build process runs for short time but eventually freezes forever. Eclipse IDE for C/C++ Developers Version: Oxygen.3a Release (4.7.3a) Build id: 20180405-1200 java version "1.8.0_181" Java(TM) SE Runtime Environment (build 1.8.0_181-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode) Eclipse options.ini: -startup plugins/org.eclipse.equinox.launcher_1.4.0.v20161219-1356.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.551.v20171108-1834 -product org.eclipse.epp.package.cpp.product -showsplash org.eclipse.epp.package.common --launcher.defaultAction openFile --launcher.defaultAction openFile --launcher.appendVmargs -vmargs -Dosgi.requiredJavaVersion=1.8 -Dosgi.instance.area.default=@user.home/eclipse-workspace -XX:+UseG1GC -XX:+UseStringDeduplication --add-modules=ALL-SYSTEM -Dosgi.requiredJavaVersion=1.8 -Xms512m -Xmx2048m --add-modules=ALL-SYSTEM Physical RAM 16259Mb (2948Mb free)