don't fail configure when tcmalloc is not found

tcmalloc is an optional dependency, but AC_MSG_FAILURE ends unconditionally when
it is not found

diff --git a/configure.ac b/configure.ac
index 855c6a828de7f9db649c37e169651a691619f2ae..fe914aa0ffd1e955267ea08261993cd12d524188 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ AC_CHECK_LIB([snappy], [snappy_compress], [HAVE_LIBSNAPPY=yes], [AC_MSG_FAILURE(
 AC_CHECK_LIB([z], [gzread], [HAVE_LIBZ=yes], [AC_MSG_FAILURE([libz not found])])
 AC_CHECK_LIB([bz2], [BZ2_bzCompressInit], [HAVE_LIBBZ2=yes], [AC_MSG_FAILURE([libbz2 not found])])
 AC_CHECK_LIB([rt], [clock_gettime], [HAVE_LIBRT=yes], [AC_MSG_FAILURE([librt not found])])
-AC_CHECK_LIB([tcmalloc], [malloc],  [HAVE_LIBTCMALLOC=yes],[AC_MSG_FAILURE([no tcmalloc found ])])
+AC_CHECK_LIB([tcmalloc], [malloc],  [HAVE_LIBTCMALLOC=yes],[AC_MSG_RESULT([no tcmalloc found ])])
 
 OLD_CXXFLAGS="$CXXFLAGS"
 CXXFLAGS="$CXXFLAGS -std=c++11"