diff options
| author | Alan Coopersmith <alan.coopersmith@oracle.com> | 2022-11-04 19:29:35 -0700 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2022-11-04 19:30:08 -0700 |
| commit | c01da8ebd0969efd15388ce999e121127cc46f67 (patch) | |
| tree | bd63329720ef74fba8f47c9bafc83e8c89367666 | |
| parent | e5ace1c5fe009e5c66fa16f886b13cce2558684a (diff) | |
Only link with libbsd if needed for arc4random_buf()
Avoid unnecessary library dependency when using a libc with this
function included
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
| -rw-r--r-- | configure.ac | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac index 3d8d76f..a73a418 100644 --- a/configure.ac +++ b/configure.ac @@ -56,11 +56,6 @@ AC_PROG_LN_S AC_CHECK_HEADERS([sys/random.h]) # Checks for libraries. -PKG_CHECK_MODULES([LIBBSD], [libbsd-overlay], [ - CFLAGS="$CFLAGS $LIBBSD_CFLAGS" - LIBS="$LIBS $LIBBSD_LIBS" -], [:]) - AC_SEARCH_LIBS([recvfrom],[socket]) case $host_os in @@ -71,6 +66,17 @@ case $host_os in ;; esac +# Checks for non-standard functions and fallback to libbsd if we can +# We only check for arc4random_buf, because if we have that, we don't +# need/use getentropy. +AC_LINK_IFELSE([AC_LANG_CALL([], [arc4random_buf])], + [TRY_LIBBSD="no"], [TRY_LIBBSD="yes"]) +AS_IF([test "x$TRY_LIBBSD" = "xyes"], + [PKG_CHECK_MODULES([LIBBSD], [libbsd-overlay], [ + CFLAGS="$CFLAGS $LIBBSD_CFLAGS" + LIBS="$LIBS $LIBBSD_LIBS" +], [:])]) + # Checks for library functions. AC_CHECK_FUNCS([srand48 lrand48 arc4random_buf getentropy]) |