rseq: output whether configure finds rseq syscall

[lttng-ust.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 82ea5dc2e26fc1ebc9d6102e29690277bc0f4f89..dd19199b1965974d3cb53fc8c3610546eed841de 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -5,11 +5,11 @@ dnl Version infos
 m4_define([V_MAJOR], [2])
 m4_define([V_MINOR], [9])
 m4_define([V_PATCH], [0])
-m4_define([V_EXTRA], [pre])
+m4_define([V_EXTRA], [rc1])
 m4_define([V_STRING], [V_MAJOR.V_MINOR.V_PATCH])
 m4_ifdef([V_EXTRA], [m4_append([V_STRING], [-V_EXTRA])])
-m4_define([V_NAME], [[J-TBD]])
-m4_define([V_DESC], [[]])
+m4_define([V_NAME], [[Joannès]])
+m4_define([V_DESC], [[Berliner Weisse style beer from the Trèfle Noir microbrewery in Rouyn-Noranda.]])
 
 AC_INIT([lttng-ust], V_STRING, [mathieu dot desnoyers at efficios dot com])
 
@@ -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 <unistd.h>
+       #include <syscall.h>
+       #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."])