Add back detailed compile time checks.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/branches/gnucash-gnome2-dev@9121 57a11ea4-9604-0410-9ed3-97b8803252fd

macros/compiler-flags.m4

@@ -0,0 +1,109 @@
+dnl GNOME_COMPILE_WARNINGS
+dnl Turn on many useful compiler warnings
+dnl For now, only works on GCC
+AC_DEFUN([GNOME_COMPILE_WARNINGS],[
+  AC_ARG_ENABLE(compile-warnings, 
+    [  --enable-compile-warnings=[no/minimum/yes]	Turn on compiler warnings.],,enable_compile_warnings=minimum)
+
+  AC_MSG_CHECKING(what warning flags to pass to the C compiler)
+  warnCFLAGS=
+  if test "x$GCC" != xyes; then
+    enable_compile_warnings=no
+  fi
+
+  if test "x$enable_compile_warnings" != "xno"; then
+    if test "x$GCC" = "xyes"; then
+      case " $CFLAGS " in
+      *[\ \	]-Wall[\ \	]*) ;;
+      *) warnCFLAGS="-Wall -Wunused" ;;
+      esac
+
+      ## -W is not all that useful.  And it cannot be controlled
+      ## with individual -Wno-xxx flags, unlike -Wall
+      if test "x$enable_compile_warnings" = "xyes"; then
+	warnCFLAGS="$warnCFLAGS -Wmissing-prototypes -Wmissing-declarations"
+      fi
+    fi
+  fi
+  AC_MSG_RESULT($warnCFLAGS)
+
+  AC_ARG_ENABLE(iso-c,
+    [  --enable-iso-c          Try to warn if code is not ISO C ],,
+    enable_iso_c=no)
+
+  AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
+  complCFLAGS=
+  if test "x$enable_iso_c" != "xno"; then
+    if test "x$GCC" = "xyes"; then
+      case " $CFLAGS " in
+      *[\ \	]-ansi[\ \	]*) ;;
+      *) complCFLAGS="$complCFLAGS -ansi" ;;
+      esac
+
+      case " $CFLAGS " in
+      *[\ \	]-pedantic[\ \	]*) ;;
+      *) complCFLAGS="$complCFLAGS -pedantic" ;;
+      esac
+    fi
+  fi
+  AC_MSG_RESULT($complCFLAGS)
+  if test "x$cflags_set" != "xyes"; then
+    CFLAGS="$CFLAGS $warnCFLAGS $complCFLAGS"
+    cflags_set=yes
+    AC_SUBST(cflags_set)
+  fi
+])
+
+dnl For C++, do basically the same thing.
+
+AC_DEFUN([GNOME_CXX_WARNINGS],[
+  AC_ARG_ENABLE(cxx-warnings, 
+    [  --enable-cxx-warnings=[no/minimum/yes]	Turn on compiler warnings.],,enable_cxx_warnings=minimum)
+
+  AC_MSG_CHECKING(what warning flags to pass to the C++ compiler)
+  warnCXXFLAGS=
+  if test "x$GCC" != xyes; then
+    enable_compile_warnings=no
+  fi
+  if test "x$enable_cxx_warnings" != "xno"; then
+    if test "x$GCC" = "xyes"; then
+      case " $CXXFLAGS " in
+      *[\ \	]-Wall[\ \	]*) ;;
+      *) warnCXXFLAGS="-Wall -Wno-unused" ;;
+      esac
+
+      ## -W is not all that useful.  And it cannot be controlled
+      ## with individual -Wno-xxx flags, unlike -Wall
+      if test "x$enable_cxx_warnings" = "xyes"; then
+	warnCXXFLAGS="$warnCXXFLAGS -Wmissing-prototypes -Wmissing-declarations -Wshadow -Woverloaded-virtual"
+      fi
+    fi
+  fi
+  AC_MSG_RESULT($warnCXXFLAGS)
+
+   AC_ARG_ENABLE(iso-cxx,
+     [  --enable-iso-cxx          Try to warn if code is not ISO C++ ],,
+     enable_iso_cxx=no)
+
+   AC_MSG_CHECKING(what language compliance flags to pass to the C++ compiler)
+   complCXXFLAGS=
+   if test "x$enable_iso_cxx" != "xno"; then
+     if test "x$GCC" = "xyes"; then
+      case " $CXXFLAGS " in
+      *[\ \	]-ansi[\ \	]*) ;;
+      *) complCXXFLAGS="$complCXXFLAGS -ansi" ;;
+      esac
+
+      case " $CXXFLAGS " in
+      *[\ \	]-pedantic[\ \	]*) ;;
+      *) complCXXFLAGS="$complCXXFLAGS -pedantic" ;;
+      esac
+     fi
+   fi
+  AC_MSG_RESULT($complCXXFLAGS)
+  if test "x$cxxflags_set" != "xyes"; then
+    CXXFLAGS="$CXXFLAGS $warnCXXFLAGS $complCXXFLAGS"
+    cxxflags_set=yes
+    AC_SUBST(cxxflags_set)
+  fi
+])