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-rw-r--r--c/src/libmisc/configure.ac12
1 files changed, 12 insertions, 0 deletions
diff --git a/c/src/libmisc/configure.ac b/c/src/libmisc/configure.ac
index 141242d756..3907b776cd 100644
--- a/c/src/libmisc/configure.ac
+++ b/c/src/libmisc/configure.ac
@@ -29,6 +29,18 @@ RTEMS_CHECK_MULTIPROCESSING(RTEMS_BSP)
AM_CONDITIONAL(HAS_MP,test "$HAS_MP" = "yes")
+# shell/* wants to assign file descriptors to stdio file descriptors.
+AC_MSG_CHECKING([for assignable stdio])
+AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [#include <stdio.h>],
+ [stdin = fopen("/tmp", "r")])],
+ [HAVE_ASSIGNABLE_STDIO=yes],
+ [HAVE_ASSIGNABLE_STDIO=no])
+AC_MSG_RESULT([$HAVE_ASSIGNABLE_STDIO])
+
+AM_CONDITIONAL([RTEMS_LIBSHELL],[test x"$HAVE_ASSIGNABLE_STDIO" = x"yes"])
+
# Explicitly list all Makefiles here
AC_CONFIG_FILES([Makefile
cpuuse/Makefile