[2.4 patch] document that gcc 4 is not supported
From: Adrian Bunk (bunk_at_stusta.de)
Date: 05/30/05
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Date: Mon, 30 May 2005 21:28:36 +0200 To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
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
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