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configure: Check STAP_PROBEV macro when building with USDT tracing

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It turns out that STAP_PROBEV() is not available on FreeBSD thus having
sdt/sdt.h is not enough. Look for it now at configure time.

Closes #40174

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2020-11-03 08:59:29 -05:00
parent 4f5a116618
commit 486ddde2c4
2 changed files with 23 additions and 5 deletions
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4
changes/ticket40174 Normal file
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@ -0,0 +1,4 @@
o Minor bugfixes (configure, build):
- With USDT tracing enabled, if STAP_PROBEV() is missing, don't attempt to
build. Linux supports that macro but not the BSDs. Fixes bug 40174; bugfix
on 0.4.5.1-alpha.

24
configure.ac
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@ -292,11 +292,25 @@ if test "x$enable_tracing_instrumentation_usdt" = "xyes"; then
AC_CHECK_HEADERS([sys/sdt.h], [],
[AC_MSG_ERROR([USDT instrumentation requires sys/sdt.h header.
On Debian, apt install systemtap-sdt-dev])], [])
dnl LTTng generates USDT probes if the UST library was built with
dnl --with-sdt. There is unfortunately no way to check that so we always
dnl build the USDT probes even though LTTng instrumentation was requested.
AC_DEFINE([USE_TRACING_INSTRUMENTATION_USDT], [1], [Using USDT instrumentation])
have_tracing=1
AC_MSG_CHECKING([STAP_PROBEV()])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#define SDT_USE_VARIADIC
#include <sys/sdt.h>
void test(void)
{
STAP_PROBEV(p, n, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
}
]])], [
AC_MSG_RESULT([yes])
dnl LTTng generates USDT probes if the UST library was built with
dnl --with-sdt. There is unfortunately no way to check that so we always
dnl build the USDT probes even though LTTng instrumentation was requested.
AC_DEFINE([USE_TRACING_INSTRUMENTATION_USDT], [1], [Using USDT instrumentation])
have_tracing=1
], [
AC_MSG_RESULT([no])
AC_MSG_ERROR([USDT tracing support requires STAP_PROBEV()])
])
fi
dnl Tracepoints event to debug logs.