[2.4 patch] document that gcc 4 is not supported

[Adrian Bunk <bunk@stusta.de>]

gcc 4 is not supported for compiling kernel 2.4, and I don't see any 
compelling reason why kernel 2.4 should ever be adapted to gcc 4.

This patch documents this fact.

Signed-off-by: Adrian Bunk <bunk@stusta.de>

---

 Documentation/Changes |    2 ++
 README                |    1 +
 init/main.c           |    7 +++++++
 3 files changed, 10 insertions(+)

--- linux-2.4.31-rc1-full/init/main.c.old	2005-05-30 21:20:00.000000000 +0200
+++ linux-2.4.31-rc1-full/init/main.c	2005-05-30 21:21:19.000000000 +0200
@@ -84,6 +84,13 @@
 #error Sorry, your GCC is too old. It builds incorrect kernels.
 #endif
 
+/*
+ * gcc >= 4 is not supported by kernel 2.4
+ */
+#if __GNUC__ > 3
+#error Sorry, your GCC is too recent for kernel 2.4
+#endif
+
 extern char _stext, _etext;
 extern char *linux_banner;
 
--- linux-2.4.31-rc1-full/README.old	2005-05-30 21:21:29.000000000 +0200
+++ linux-2.4.31-rc1-full/README	2005-05-30 21:21:59.000000000 +0200
@@ -152,6 +152,7 @@
 
  - Make sure you have gcc 2.95.3 available.  gcc 2.91.66 (egcs-1.1.2) may
    also work but is not as safe, and *gcc 2.7.2.3 is no longer supported*.
+   gcc 4 is *not* supported.
    Also remember to upgrade your binutils package (for as/ld/nm and company)
    if necessary. For more information, refer to ./Documentation/Changes.
 
--- linux-2.4.31-rc1-full/Documentation/Changes.old	2005-05-30 21:22:10.000000000 +0200
+++ linux-2.4.31-rc1-full/Documentation/Changes	2005-05-30 21:22:41.000000000 +0200
@@ -91,6 +91,8 @@
 You should ensure you use gcc-2.96-74 or later. gcc-2.96-54 will not build
 the kernel correctly.
 
+gcc 4 is not supported.
+
 In addition, please pay attention to compiler optimization.  Anything
 greater than -O2 may not be wise.  Similarly, if you choose to use gcc-2.95.x
 or derivatives, be sure not to use -fstrict-aliasing (which, depending on