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tests: include <unistd.h> in test_perf.c - #44
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test_perf.c uses fork(), _exit(), sysconf() and _SC_PAGESIZE without including <unistd.h>. With GCC 12 the transitive include is missing and the CMake build fails with "_SC_PAGESIZE undeclared".
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test_perf.cusesfork(),_exit(),sysconf()and_SC_PAGESIZEwithout including
<unistd.h>. With GCC 12 the transitive include ismissing and the CMake build fails on
dto-test-perfwith'_SC_PAGESIZE' undeclared. GCC 11.5 / Ubuntu 24.04 is unaffected.