Updated setup.

[wxWidgets.git] / configure.in

diff --git a/configure.in b/configure.in
index f3df19aa1f95ec24567411441ea44788a60ff515..1dfe34170f937659ca4ee55c1348c9fd79a730ba 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -7583,8 +7583,59 @@ if test "$wxUSE_MAC" = 1 ; then
     #       The makefile currently uses AR and RANLIB, which libtool apparently supercedes.
 fi
 
+dnl gcc 3.4 has a pch bug which truncates wide character constants in headers.
+dnl Hopefully for a non-unicode build there aren't any wide constants in
+dnl headers, but for a unicode build it's best to disable pch.
+if test "$wxUSE_UNICODE" = yes -a "$GCC" = yes -a "$bk_use_pch" != no
+then
+    AC_CACHE_CHECK(
+        [for gcc precompiled header bug],
+        [wx_cv_gcc_pch_bug],
+        [[
+            wx_cv_gcc_pch_bug=no
+            echo 'const wchar_t test_var[] = L"wide string";' > conftest.h
+
+            if $CXX conftest.h >& /dev/null
+            then
+                {
+                    echo '#include "conftest.h"'
+                    echo 'const wchar_t *test() { return test_var; }'
+                } > conftest.cpp
+
+                if $CXX -c -o conftest.o conftest.cpp >& /dev/null
+                then
+                    tr -dc 'a-z' < conftest.o |
+                        grep 'widestring' >& /dev/null ||
+                        wx_cv_gcc_pch_bug=yes
+                fi
+            fi
+
+            rm -f conftest.h conftest.gch conftest.cpp conftest.o
+        ]])
+
+    if test "$wx_cv_gcc_pch_bug" = yes; then
+        dnl make the default for pch 'no'
+        dnl further below check whether the user overrode and warn them
+        bk_use_pch=no
+    fi
+fi
+
 AC_BAKEFILE([m4_include(autoconf_inc.m4)])
 
+dnl find out if the compiler supports PCH
+dnl
+dnl TODO: this should be in bakefile
+if test $GCC_PCH = 1
+then
+    if test "$wx_cv_gcc_pch_bug" = yes; then
+        AC_MSG_WARN([*** Precompiled header support is broken on this compiler])
+        AC_MSG_WARN([*** --enable-precomp-headers is not recommended])
+        AC_MSG_WARN([*** see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13361])
+    fi
+
+    CPPFLAGS="-DWX_PRECOMP $CPPFLAGS"
+fi
+
 dnl HACK ALERT!! 
 dnl For now, we need to alter bk-deps not to generate deps
 dnl when we've configured a Universal binary build.
@@ -7637,13 +7688,6 @@ if test "$wxUSE_OMF" = "yes"; then
     esac
 fi
 
-dnl find out if the compiler supports PCH
-dnl
-dnl TODO: this should be in bakefile
-if test $GCC_PCH = 1 ; then
-    CPPFLAGS="-DWX_PRECOMP $CPPFLAGS"
-fi
-
 dnl TOOLCHAIN_DEFS should be used for both wx and client code
 WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS $TOOLCHAIN_DEFS"