diff options
Diffstat (limited to 'configure.in')
-rw-r--r-- | configure.in | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 6888087964..7844bc68c0 100644 --- a/configure.in +++ b/configure.in @@ -2609,6 +2609,28 @@ AS_CASE(["$FIRSTMAKEFILE"], [*GNUmakefile:*], [gnumake=yes], [ gnumake=no]) AC_MSG_RESULT($gnumake) ]) +AS_IF([test "$gnumake" = yes], [ NULLCMD=: ], [ + AC_MSG_CHECKING([for safe null command for ${Make-make}]) + mkdir conftest.dir + echo 'A=1' > conftest.dir/Makefile + echo 'B=$(A:1=@:)' >> conftest.dir/Makefile + echo 'all:; $B 1 2 3 4 5 6 7 8 9' >> conftest.dir/Makefile + if (cd conftest.dir; ${Make-make} >/dev/null 2>/dev/null); then + NULLCMD=: + else + echo 'A=1' > conftest.dir/Makefile + echo 'B=$(A:1=@true)' >> conftest.dir/Makefile + echo 'all:; $B 1 2 3 4 5 6 7 8 9' >> conftest.dir/Makefile + if (cd conftest.dir; ${Make-make} >/dev/null 2>/dev/null); then + NULLCMD=true + else + AC_MSG_ERROR(no candidate for safe null command) + fi + fi + rm -fr conftest.dir + AC_MSG_RESULT($NULLCMD) +]) +AC_SUBST(NULLCMD) if test "${universal_binary-no}" = yes ; then AC_CACHE_CHECK([for architecture macros], rb_cv_architecture_macros, [ |