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The project Makefile uses a script (sysinfo.sh) to non-atomically generate two .c files (sysinfo.c, sysinfoc.c) which are then included in the build. Since the script always overwrites both .c files, the Makefile should only invoke it once, not twice in parallel. Otherwise the .c files may be corrupted and cause random build failures in parallel builds. Requires at least GNU make 4.3, for Grouped Targets support [1]. [1] https://lists.gnu.org/archive/html/info-gnu/2020-01/msg00004.html Reviewed-by: Silvio Fricke <silvio.fricke@gin.de> Signed-off-by: Daniel Klauer <daniel.klauer@gin.de> Signed-off-by: Khem Raj <raj.khem@gmail.com>