- add -lgen if it's needed to get dirname()

- since we now have three places where we need to add a -l<foo> if
  and only if it isn't already in something in LIBS that provides
  symbol bar...

This commit was SVN r8370.

acinclude.m4

@@ -55,6 +55,7 @@ m4_include(config/ompi_config_asm.m4)
 
 m4_include(config/ompi_case_sensitive_fs_setup.m4)
 m4_include(config/ompi_check_broken_qsort.m4)
+m4_include(config/ompi_check_func_lib.m4)
 m4_include(config/ompi_check_optflags.m4)
 m4_include(config/ompi_check_icc.m4)
 m4_include(config/ompi_check_gm.m4)

config/ompi_check_func_lib.m4

@@ -0,0 +1,46 @@
+dnl -*- shell-script -*-
+dnl
+dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
+dnl                         University Research and Technology
+dnl                         Corporation.  All rights reserved.
+dnl Copyright (c) 2004-2005 The University of Tennessee and The University
+dnl                         of Tennessee Research Foundation.  All rights
+dnl                         reserved.
+dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
+dnl                         University of Stuttgart.  All rights reserved.
+dnl Copyright (c) 2004-2005 The Regents of the University of California.
+dnl                         All rights reserved.
+dnl $COPYRIGHT$
+dnl 
+dnl Additional copyrights may follow
+dnl 
+dnl $HEADER$
+dnl
+
+# OMPI_CHECK_FUNC_LIB(func, lib)
+# ------------------------------
+# Try to find function func, first with the present LIBS, second with
+# lib added to LIBS.  If func is found with the libraries listed in
+# LIBS, no modification to LIBS is made.  If func is in lib (but not
+# in LIBS) then lib is added to LIBS.  If func is not in lib, then
+# LIBS is not modified.
+AC_DEFUN([OMPI_CHECK_FUNC_LIB],[
+    AC_MSG_CHECKING([if we need -l$2 for $1])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern char *]$1[;]],
+                                    [[char *bar = ]$1[;]])],
+        [MSG="no"],
+        [LIBS_save="$LIBS"
+         LIBS="$LIBS -l$2"
+         AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern char *]$1[;]],
+                                         [[char *bar = ]$1[;]])],
+             [WRAPPER_EXTRA_LIBS="$WRAPPER_EXTRA_LIBS -l$2"
+              MSG="yes"],
+             [LIBS="$LIBS_save"
+              MSG="not found"])])
+    AC_MSG_RESULT([$MSG])
+
+    # see if we actually have $1.  Use AC_CHECK_FUNCS so that it
+    # does the glibs "not implemented" check.  Will use the current LIBS,
+    # so will check in -l$2 if we decided we needed it above
+    AC_CHECK_FUNCS([$1])
+])

configure.ac

@@ -1166,63 +1166,15 @@ AC_DEFINE_UNQUOTED(OMPI_HAVE_UNDERSCORE_VA_COPY, $OMPI_HAVE_UNDERSCORE_VA_COPY,
 
 AC_CHECK_DECLS(__func__)
 
-#
-# Solaris has sched_yield in -lrt.  Can't use a simple AC_CHECK_LIB,
-# though, because Linux has sched_yield in glic (so linking in librt
-# will "find" sched_yield, even though it would have been found anyway
-# -- so -lrt would be useless [and potentially harmful?] in this
-# case).
-# 
 
-AC_MSG_CHECKING([if we need -lrt for sched_yield])
-AC_LINK_IFELSE(AC_LANG_PROGRAM([[extern char *sched_yield;]],
-[[char *bar = sched_yield;]]),
-[MSG=no],[MSG=not_found])
-if test "$MSG" = "not_found"; then
-    LIBS_save="$LIBS"
-    LIBS="$LIBS -lrt"
-    AC_LINK_IFELSE(AC_LANG_PROGRAM([[extern char *sched_yield;]],
-[[char *bar = sched_yield;]]),
-[MSG=yes],[MSG=not_found])
-    if test "$MSG" = "not_found"; then
-        LIBS="$LIBS_save"
-    fi
-fi
-AC_MSG_RESULT([$MSG])
+# Solaris has sched_yeild in -lrt, usually in libc
+OMPI_CHECK_FUNC_LIB([sched_yield], [rt])
 
-# see if we actually have sched_yeild.  Use AC_CHECK_FUNCS so that it
-# does the glibs "not implemented" check.  Will use the current LIBS,
-# so will check in -lrt if we decided we needed it above
-AC_CHECK_FUNCS([sched_yield])
+# FreeBSD has backtrace in -lexecinfo, usually in libc
+OMPI_CHECK_FUNC_LIB([backtrace], [execinfo])
 
-#
-# FreeBSD has backtrace in -lexecinfo.  Can't use a simple AC_CHECK_LIB,
-# though, because Linux has backtrace in glic (so linking in libexecinfo
-# will "find" backtrace, even though it would have been found anyway
-# -- so -lexecinfo would be useless [and potentially harmful?] in this
-# case).
-# 
-
-AC_MSG_CHECKING([if we need -lexecinfo for backtrace])
-AC_LINK_IFELSE(AC_LANG_PROGRAM([[extern char *backtrace;]],
-[[char *bar = backtrace;]]),
-[MSG=no],[MSG=not_found])
-if test "$MSG" = "not_found"; then
-    LIBS_save="$LIBS"
-    LIBS="$LIBS -lexecinfo"
-    AC_LINK_IFELSE(AC_LANG_PROGRAM([[extern char *backtrace;]],
-[[char *bar = backtrace;]]),
-[MSG=yes],[MSG=not_found])
-    if test "$MSG" = "not_found"; then
-        LIBS="$LIBS_save"
-    fi
-fi
-AC_MSG_RESULT([$MSG])
-
-# see if we actually have backtrace.  Use AC_CHECK_FUNCS so that it
-# does the glibs "not implemented" check.  Will use the current LIBS,
-# so will check in -lexecinfo if we decided we needed it above
-AC_CHECK_FUNCS([backtrace])
+# IRIX has dirname in -lgen, usually in libc
+OMPI_CHECK_FUNC_LIB([dirname], [gen])
 
 #
 # See if we need the math library explicitly linked in