configure.in: check exit statuses

* configure.in (RUBY_DTRACE_POSTPROCESS): check exit statuses of
  commands.  [Bug #8606]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41816 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

configure.in

@@ -560,19 +560,21 @@ AC_DEFUN([RUBY_DTRACE_AVAILABLE],
 AC_DEFUN([RUBY_DTRACE_POSTPROCESS],
 [AC_CACHE_CHECK(whether $DTRACE needs post processing, rb_cv_prog_dtrace_g,
 [
- echo "provider conftest{ probe fire(); };" > conftest_provider.d
- dtrace -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null
- cat >conftest.c <<_CONF
-   #include "conftest_provider.h"
-   int main(void){ CONFTEST_FIRE(); return 0; }
+  if {
+    echo "provider conftest{ probe fire(); };" > conftest_provider.d &&
+    dtrace -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null &&
+    cat >conftest.c <<_CONF &&
+    @%:@include "conftest_provider.h"
+    int main(void){ CONFTEST_FIRE(); return 0; }
 _CONF
- $CC $CFLAGS -c -o conftest.o conftest.c
- if $DTRACE -G -s conftest_provider.d conftest.o 2>/dev/null; then
-   rb_cv_prog_dtrace_g=yes
- else
-   rb_cv_prog_dtrace_g=no
- fi
- rm -f conftest.[co] conftest_provider.[dho]
+    $CC $CFLAGS -c -o conftest.o conftest.c &&
+    $DTRACE -G -s conftest_provider.d conftest.o 2>/dev/null
+  }; then
+    rb_cv_prog_dtrace_g=yes
+  else
+    rb_cv_prog_dtrace_g=no
+  fi
+  rm -f conftest.[co] conftest_provider.[dho]
 ])
 ])