From 3159b2518d9f8006e324a64c27430714da844b23 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Mon, 21 Nov 2016 15:51:47 -0500 Subject: [PATCH] rseq: output whether configure finds rseq syscall Signed-off-by: Mathieu Desnoyers --- configure.ac | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/configure.ac b/configure.ac index 1add5d63..dd19199b 100644 --- a/configure.ac +++ b/configure.ac @@ -224,6 +224,21 @@ AS_IF([test "x$have_perf_event" = "xyes"], [ AC_DEFINE([LTTNG_UST_HAVE_PERF_EVENT], [1]) ]) +AC_MSG_CHECKING([Restartable Sequences]) +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ + #include + #include + #ifndef __NR_rseq + #error "Restartable Sequences system call not wired up in your kernel headers." + #endif +]])], [ + AC_MSG_RESULT([yes]) + have_rseq=yes +], [ + AC_MSG_RESULT([no]) + have_rseq=no +]) + AC_MSG_CHECKING([host system alignment requirements]) AS_CASE([$host_cpu], [i[[3456]]86], [], @@ -523,6 +538,9 @@ AS_ECHO(["Architecture: $host_cpu"]) AS_ECHO_N(["Efficient unaligned memory access: "]) AS_IF([test "x$NO_UNALIGNED_ACCESS" != "x1"], [AS_ECHO(["yes"])], [AS_IF([test "x$UNSUPPORTED_ARCH" != "x1"], [AS_ECHO(["no"])], [AS_ECHO(["unknown"])])]) AS_IF([test "x$UNSUPPORTED_ARCH" = "x1"], [AC_MSG_WARN([Your architecture ($host_cpu) is unsupported, using safe default of no unaligned access])]) + +AS_ECHO_N(["Restartable Sequences system call: "]) +AS_IF([test "x$have_rseq" = "xyes"], [AS_ECHO(["yes"])], [AS_ECHO(["no"])]) AS_ECHO AS_ECHO(["Type 'make' to compile."]) -- 2.34.1