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Avoid usage of PATH_MAX not available on hurd
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Enable backtrace generation
Currently building on hppa fails with:
test-backtrace.c:10: Assert failed: backtrace_append(bt) == 0 test-backtrace.c:14: Assert failed: strstr(str_c(bt), "test_backtrace") != NULL backtrace_append ..................................................... : FAILED test-backtrace.c:34: Assert failed: backtrace_get(&bt) == 0on riscv64:
Debug: backtrace: './test-lib(+0x734d8) [0x2aaab1d4d8]' test-backtrace.c:21: Assert failed: strstr(str_c(bt), "test_backtrace_append") != NULL || strstr(str_c(bt), "main") != NULL backtrace_append ..................................................... : FAILED Debug: backtrace: './test-lib(+0x734d8) [0x2aaab1d4d8]' test-backtrace.c:45: Assert failed: strstr(bt, "test_backtrace_get") != NULL || strstr(bt, "main") != NULL backtrace_get ........................................................ : FAILEDon sparc64:
Debug: backtrace: './test-lib(+0x95ec8) [0x10000095ec8]' test-backtrace.c:21: Assert failed: strstr(str_c(bt), "test_backtrace_append") != NULL || strstr(str_c(bt), "main") != NULL backtrace_append ..................................................... : FAILED Debug: backtrace: './test-lib(+0x95ec8) [0x10000095ec8]' test-backtrace.c:45: Assert failed: strstr(bt, "test_backtrace_get") != NULL || strstr(bt, "main") != NULL backtrace_get ........................................................ : FAILED