Better URL for unordered_set error message. The new wiki page

contains only information relevant to this particular error.
Also perform the check earlier during configure.

diff --git a/configure.ac b/configure.ac
index eb5c22c5a545d875d87872576f5100c282075578..ca49d5f54cfd3192f73a7ff2498bb6d1e1c99476 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -125,6 +125,47 @@ if test "x$GXX" = "xyes"; then
        fi
 fi
 
+# Test for broken unordered_set on GCC 4.0.0, shipped with Apple XCode tools
+# This is a system header so we check it as soon as possible
+AC_MSG_CHECKING([TR1 unordered_set usability])
+AC_COMPILE_IFELSE([
+#include <tr1/unordered_set>
+int main() {
+  std::tr1::unordered_set<int> i, j;
+  i = j;
+  return 0;
+}
+], [unordered_set_broken=no], [unordered_set_broken=yes])
+if test "x$unordered_set_broken" = "xyes"; then
+       AC_MSG_RESULT([broken])
+       AC_MSG_ERROR([
+You have a broken version of the <tr1/unordered_set> header. See
+http://wiki.inkscape.org/wiki/index.php/HashtableFixOSX
+for information on how to fix this problem.])
+else
+       AC_MSG_RESULT([ok])
+fi
+
+# Test whether GCC emits a spurious warning when using boost::optional
+# If yes, turn off strict aliasing warnings to reduce noise
+# and allow the legitimate warnings to stand out
+AC_MSG_CHECKING([for overzealous strict aliasing warnings])
+ignore_strict_aliasing=no
+CXXFLAGS_SAVE=$CXXFLAGS
+CXXFLAGS="$CXXFLAGS -Werror=strict-aliasing"
+AC_COMPILE_IFELSE([
+#include <boost/optional.hpp>
+boost::optional<int> x;
+int func() {
+  return *x;
+}
+], [ignore_strict_aliasing=no], [ignore_strict_aliasing=yes])
+AC_MSG_RESULT($ignore_strict_aliasing)
+CXXFLAGS=$CXXFLAGS_SAVE
+if test "x$ignore_strict_aliasing" = "xyes"; then
+  CXXFLAGS="$CXXFLAGS -Wno-strict-aliasing"
+fi
+
 dnl ******************************
 dnl Gettext stuff
 dnl ******************************
@@ -675,42 +716,6 @@ AM_CONDITIONAL(HAVE_CARBON, test "x$carbon_ok" = "xyes")
 # Check for some boost header files
 AC_CHECK_HEADERS([boost/concept_check.hpp], [], AC_MSG_ERROR([You need the boost package (e.g. libboost-dev)]))
 
-# Test whether GCC emits a spurious warning when using boost::optional
-# If yes, turn off strict aliasing warnings to reduce noise
-AC_MSG_CHECKING([for overzealous strict aliasing warnings])
-ignore_strict_aliasing=no
-CXXFLAGS_SAVE=$CXXFLAGS
-CXXFLAGS="$CXXFLAGS -Werror=strict-aliasing"
-AC_COMPILE_IFELSE([
-#include <boost/optional.hpp>
-boost::optional<int> x;
-int func() {
-  return *x;
-}
-], [ignore_strict_aliasing=no], [ignore_strict_aliasing=yes])
-AC_MSG_RESULT($ignore_strict_aliasing)
-CXXFLAGS=$CXXFLAGS_SAVE
-if test "x$ignore_strict_aliasing" = "xyes"; then
-  CXXFLAGS="$CXXFLAGS -Wno-strict-aliasing"
-fi
-
-# Test for broken unordered_set on GCC 4.0.0, shipped with Apple XCode tools
-AC_MSG_CHECKING([TR1 unordered_set usability])
-AC_COMPILE_IFELSE([
-#include <tr1/unordered_set>
-int main() {
-  std::tr1::unordered_set<int> i, j;
-  i = j;
-  return 0;
-}
-], [unordered_set_broken=no], [unordered_set_broken=yes])
-if test "x$unordered_set_broken" = "xyes"; then
-       AC_MSG_RESULT([broken])
-       AC_MSG_ERROR([You have a broken version of the <tr1/unordered_set> header. See http://wiki.inkscape.org/wiki/index.php/CompilingMacOsX for information on how to fix this problem.])
-else
-       AC_MSG_RESULT([ok])
-fi
-
 PKG_CHECK_MODULES(CAIRO_PDF, cairo-pdf, cairo_pdf=yes, cairo_pdf=no)
 if test "x$cairo_pdf" = "xyes"; then
   AC_DEFINE(HAVE_CAIRO_PDF, 1, [Whether the Cairo PDF backend is available])
@@ -794,7 +799,7 @@ elif test "$enable_binreloc" = "auto"; then
 elif test "$enable_binreloc" = "no"; then
        AC_MSG_RESULT(no)
 else
-       AC_MSG_RESULT(no (unknown value "$enable_binreloc"))
+       AC_MSG_RESULT([no (unknown value "$enable_binreloc")])
        enable_binreloc=no
 fi
 AC_DEFINE(BR_PTHREADS,[0],[Use binreloc thread support?])