Adding compiler warnings.

1 files changed, 156 insertions, 0 deletions

diff --git a/m4/dmstools_gcc.m4 b/m4/dmstools_gcc.m4
new file mode 100644
index 0000000..ae8c13d
--- /dev/null
+++ b/m4/dmstools_gcc.m4
@@ -0,0 +1,156 @@
+#
+#   DMS Tools and Utilities
+#   Copyright (C) 2010 David M. Syzdek <david@syzdek.net>
+#
+#   @SYZDEK_LICENSE_HEADER_START@
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, write to the Free Software
+#   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+#   @SYZDEK_LICENSE_HEADER_END@
+#
+#   acinclude.m4 - custom m4 macros used by configure.ac
+#
+
+# AC_DMS_ENABLE_WARNINGS()
+# ______________________________________________________________________________
+AC_DEFUN([AC_DMS_ENABLE_WARNINGS],[dnl
+
+   # prerequists
+   AC_REQUIRE([AC_PROG_CC])
+
+   # sets compiler
+   if test "x${CC}" == "x";then
+      ac_dms_cc=cc;
+   else
+      ac_dms_cc=${CC};
+   fi
+
+   # display options
+   enableval=""
+   AC_ARG_ENABLE(
+      warnings,
+      [AC_HELP_STRING([--disable-warnings], [disable compiler warnings])],
+      [ EWARNINGS=$enableval ],
+      [ EWARNINGS=$enableval ]
+   )
+   enableval=""
+   AC_ARG_ENABLE(
+      strictwarnings,
+      [AC_HELP_STRING([--enable-strictwarnings], [enable strict compiler warnings])],
+      [ ESTRICTWARNINGS=$enableval ],
+      [ ESTRICTWARNINGS=$enableval ]
+   )
+
+   # sets options
+   if test "x${ESTRICTWARNINGS}" != "xyes";then
+      USE_STRICTWARNINGS=no
+   else
+      USE_STRICTWARNINGS=yes
+   fi
+   if test "x${EWARNINGS}" != "xno";then
+      USE_WARNINGS=yes
+   else
+      USE_WARNINGS=no
+      USE_STRICTWARNINGS=no
+   fi
+
+   # list of args
+   ac_dms_warnings_list=""
+   if test "x${USE_WARNINGS}" == "xyes";then
+      ac_dms_warnings_list=" ${ac_dms_warnings_list} -W"
+      ac_dms_warnings_list=" ${ac_dms_warnings_list} -Wall"
+      ac_dms_warnings_list=" ${ac_dms_warnings_list} -Werror"
+   fi
+   if test "x${USE_STRICTWARNINGS}" == "xyes";then
+      ac_dms_warnings_list="${ac_dms_warnings_list} -std=gnu99"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -pedantic"
+      #ac_dms_warnings_list="${ac_dms_warnings_list} -Wtraditional"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wpragma-once"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wextra-tokens"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wnewline-eof"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wsequence-point"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wdiv-by-zero"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wfloat-equal"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wdisabled-optimization"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wchar-subscripts"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wcomment"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wformat"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wimplicit"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmain"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmissing-braces"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wparentheses"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wreturn-type"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wswitch"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wswitch-default"   # for some reason any call to memset() fails with this flag
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wtrigraphs"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wunused"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wunknown-pragmas"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wuninitialized"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmultichar"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wundef"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wendif-labels"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wshadow"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wlarger-than-4096"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wpointer-arith"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wbad-function-cast"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wcast-qual"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wcast-align"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wwrite-strings"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wconversion"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wsign-compare"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Waggregate-return"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wstrict-prototypes"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wstrict-aliasing"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmissing-prototypes"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmissing-declarations"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmissing-noreturn"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wmissing-format-attribute" # vprintf is failing this warning
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wredundant-decls"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wunreachable-code"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Winvalid-pch"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wpacked"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wpadded"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wnested-externs"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wenum-clash"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Winline"
+      ac_dms_warnings_list="${ac_dms_warnings_list} -Wlong-long"
+   fi
+
+   # creates test source code
+   AC_LANG_CONFTEST(
+      [AC_LANG_PROGRAM(
+         [[int main(void);]],
+         [[return(0);]]
+      )])
+
+   # loops throough options
+   CFLAGS_WARNINGS=""
+   for ac_dms_warning in ${ac_dms_warnings_list};do
+      AC_MSG_CHECKING(for gcc flag ${ac_dms_warning})
+      ${ac_dms_cc} ${CFLAGS_WARNINGS} ${ac_dms_warning} conftest.c -o conftest.o > /dev/null 2>&1
+      if test "x$?" == "x0";then
+         CFLAGS_WARNINGS="${CFLAGS_WARNINGS} ${ac_dms_warning}"
+         AC_MSG_RESULT(yes)
+      else
+         AC_MSG_RESULT(no)
+      fi
+   done
+
+   # export variables
+   AC_SUBST(CFLAGS_WARNINGS, "$CFLAGS_WARNINGS")
+])dnl
+
+
+# end of M4 file