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+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 3 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., 51 Franklin Street, Boston, MA 02110-1301, 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
+])
personal git repositories of Harald Welte. Your mileage may vary