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Commit 7a1e026b authored by Max Kellermann's avatar Max Kellermann
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configure.ac: check for pthread before librt

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.
parent 64f04ee6
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Showing with 12 additions and 12 deletions
configure.ac
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...@@ -193,6 +193,18 @@ dnl --------------------------------------------------------------------------- ...@@ -193,6 +193,18 @@ dnl ---------------------------------------------------------------------------
dnl Header/Library Checks dnl Header/Library Checks
dnl --------------------------------------------------------------------------- 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_SEARCH_LIBS([clock_gettime], [rt])
AC_ARG_ENABLE(syslog, AC_ARG_ENABLE(syslog,
...@@ -229,18 +241,6 @@ AC_CHECK_HEADERS(valgrind/memcheck.h) ...@@ -229,18 +241,6 @@ AC_CHECK_HEADERS(valgrind/memcheck.h)
AC_CHECK_HEADERS([sys/prctl.h], AC_CHECK_FUNCS([prctl])) 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 ---------------------------------------------------------------------------
dnl Event loop selection dnl Event loop selection
dnl --------------------------------------------------------------------------- dnl ---------------------------------------------------------------------------
......
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