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configure.ac: check for pthread before librt

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Works around a linker problem with some older glibc versions: if
"-lrt" was used, then "-pthread" was implied, but only the symbols
used by librt were available.  This led to a linker error because
pthread_atfork() was not found.

So with "-lrt", autoconf decides that no pthread flag is necessary,
but in the end fails due to pthread_atfork() missing.

By checking for pthread before librt, we avoid this dependency
problem.
This commit is contained in:
Max Kellermann 2014-12-09 18:42:35 +01:00
parent 64f04ee6db
commit 7a1e026bb5
1 changed files with 12 additions and 12 deletions
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24
configure.ac
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@ -193,6 +193,18 @@ dnl ---------------------------------------------------------------------------
dnl Header/Library Checks
dnl ---------------------------------------------------------------------------
AX_PTHREAD
LIBS="$PTHREAD_LIBS $LIBS"
AM_CFLAGS="$AM_CFLAGS $PTHREAD_CFLAGS"
AM_CXXFLAGS="$AM_CXXFLAGS $PTHREAD_CFLAGS"
AC_CHECK_LIB([pthread], [pthread_setname_np],
[have_pthread_setname_np=yes],
[have_pthread_setname_np=no])
if test x$have_pthread_setname_np = xyes; then
AC_DEFINE(HAVE_PTHREAD_SETNAME_NP, 1, [Is pthread_setname_np() available?])
fi
AC_SEARCH_LIBS([clock_gettime], [rt])
AC_ARG_ENABLE(syslog,
@ -229,18 +241,6 @@ AC_CHECK_HEADERS(valgrind/memcheck.h)
AC_CHECK_HEADERS([sys/prctl.h], AC_CHECK_FUNCS([prctl]))
AX_PTHREAD
LIBS="$PTHREAD_LIBS $LIBS"
AM_CFLAGS="$AM_CFLAGS $PTHREAD_CFLAGS"
AM_CXXFLAGS="$AM_CXXFLAGS $PTHREAD_CFLAGS"
AC_CHECK_LIB([pthread], [pthread_setname_np],
[have_pthread_setname_np=yes],
[have_pthread_setname_np=no])
if test x$have_pthread_setname_np = xyes; then
AC_DEFINE(HAVE_PTHREAD_SETNAME_NP, 1, [Is pthread_setname_np() available?])
fi
dnl ---------------------------------------------------------------------------
dnl Event loop selection
dnl ---------------------------------------------------------------------------