Houston, we have a trunk.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 128 insertions, 0 deletions

diff --git a/gr-howto-write-a-block/config/lf_warnings.m4 b/gr-howto-write-a-block/config/lf_warnings.m4
new file mode 100644
index 000000000..0ebb97ef9
--- /dev/null
+++ b/gr-howto-write-a-block/config/lf_warnings.m4
@@ -0,0 +1,128 @@
+dnl Copyright (C) 1988 Eleftherios Gkioulekas <lf@amath.washington.edu>
+dnl  
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl 
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software 
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+dnl 
+dnl As a special exception to the GNU General Public License, if you 
+dnl distribute this file as part of a program that contains a configuration 
+dnl script generated by Autoconf, you may include it under the same 
+dnl distribution terms that you use for the rest of that program.
+
+# --------------------------------------------------------------------------
+# Check whether the C++ compiler accepts a certain flag
+# If it does it adds the flag to CXXFLAGS
+# If it does not then it returns an error to lf_ok
+# Usage:
+#   LF_CHECK_CXX_FLAG(-flag1 -flag2 -flag3 ...)
+# -------------------------------------------------------------------------
+
+AC_DEFUN([LF_CHECK_CXX_FLAG],[
+  echo 'void f(){}' > conftest.cc
+  for i in $1
+  do
+    AC_MSG_CHECKING([whether $CXX accepts $i])
+    if test -z "`${CXX} $i -c conftest.cc 2>&1`"
+    then
+      CXXFLAGS="${CXXFLAGS} $i"
+      AC_MSG_RESULT(yes)
+    else
+      AC_MSG_RESULT(no)
+    fi
+  done
+  rm -f conftest.cc conftest.o
+])
+
+# --------------------------------------------------------------------------
+# Check whether the C compiler accepts a certain flag
+# If it does it adds the flag to CFLAGS
+# If it does not then it returns an error to lf_ok
+# Usage:
+#  LF_CHECK_CC_FLAG(-flag1 -flag2 -flag3 ...)
+# -------------------------------------------------------------------------
+
+AC_DEFUN([LF_CHECK_CC_FLAG],[
+  echo 'void f(){}' > conftest.c
+  for i in $1
+  do
+    AC_MSG_CHECKING([whether $CC accepts $i])
+    if test -z "`${CC} $i -c conftest.c 2>&1`"
+    then
+      CFLAGS="${CFLAGS} $i"
+      AC_MSG_RESULT(yes)
+    else
+      AC_MSG_RESULT(no)
+    fi
+  done
+  rm -f conftest.c conftest.o
+])
+
+# --------------------------------------------------------------------------
+# Check whether the Fortran compiler accepts a certain flag
+# If it does it adds the flag to FFLAGS
+# If it does not then it returns an error to lf_ok
+# Usage:
+#  LF_CHECK_F77_FLAG(-flag1 -flag2 -flag3 ...)
+# -------------------------------------------------------------------------
+
+AC_DEFUN([LF_CHECK_F77_FLAG],[
+  cat << EOF > conftest.f
+c....:++++++++++++++++++++++++
+      PROGRAM MAIN
+      PRINT*,'Hello World!'
+      END
+EOF
+  for i in $1
+  do
+    AC_MSG_CHECKING([whether $F77 accepts $i])
+    if test -z "`${F77} $i -c conftest.f 2>&1`"
+    then
+      FFLAGS="${FFLAGS} $i"
+      AC_MSG_RESULT(yes)  
+    else
+      AC_MSG_RESULT(no)
+    fi
+  done
+  rm -f conftest.f conftest.o
+])
+
+# ----------------------------------------------------------------------
+# Provide the configure script with an --with-warnings option that
+# turns on warnings. Call this command AFTER you have configured ALL your
+# compilers. 
+# ----------------------------------------------------------------------
+
+AC_DEFUN([LF_SET_WARNINGS],[
+  dnl Check for --with-warnings
+  AC_MSG_CHECKING([whether user wants warnings])
+  AC_ARG_WITH(warnings,
+              [  --with-warnings         Turn on warnings],
+              [ lf_warnings=yes ], [ lf_warnings=no ])
+  lf_warnings=yes # hard code for now -eb
+  AC_MSG_RESULT($lf_warnings)
+  
+  dnl Warnings for the two main compilers
+  cc_warning_flags="-Wall"
+  cxx_warning_flags="-Wall -Woverloaded-virtual"
+  if test $lf_warnings = yes
+  then
+    if test -n "${CC}"
+    then
+      LF_CHECK_CC_FLAG($cc_warning_flags)
+    fi
+    if test -n "${CXX}" 
+    then
+      LF_CHECK_CXX_FLAG($cxx_warning_flags)
+    fi
+  fi
+])