GCC - Revision history

ThomasL at 11:35, 18 March 2013

2013-03-18T11:35:58Z

Ralf: Add references section.

2012-09-05T20:03:51Z

Add references section.

Ralf: /* GCC 4.7.0 and 4.7.1 code generation bug */

2012-09-05T19:55:21Z

‎GCC 4.7.0 and 4.7.1 code generation bug

Ralf at 08:17, 5 September 2012

2012-09-05T08:17:27Z

Ralf: /* Linux 2.4 */ Grammar fix

2010-08-13T02:33:20Z

‎Linux 2.4: Grammar fix

Alec v: /* External links */

2010-08-12T15:15:22Z

‎External links

Polluks: /* Linux 2.4 */ typo

2010-08-12T11:02:46Z

‎Linux 2.4: typo

Alec v: /* Linux 2.4 */

2008-02-26T20:32:55Z

‎Linux 2.4

Okumoto: /* Linux 2.6 */

2007-10-14T10:10:56Z

‎Linux 2.6

Ralf: Fill in the exact version numbers to help people a bit.

2006-02-24T01:17:45Z

Fill in the exact version numbers to help people a bit.

@@ Line 15: / Line 15: @@
 === GCC 4.7.1 and older code generation bug ===
-A bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369</ref> in these two compiler versions results in bad code for the kernel in such ways that could be taken for a hardware bug, for example error messages about lost interrupts or similar.  As of 2012-09-05 the status is that apparently the code generation for <tt>__builtin_unreachable()</tt> is broken for MIPS and a fix has been checked in upstream but no releases based on that are out yet.  It ''appears'' that kernels built with <tt>-O</tt> by modifying the kernel's main makefile are ok.
+A bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369</ref> in these two compiler versions results in bad code for the kernel in such ways that could be taken for a hardware bug, for example error messages about lost interrupts or similar. It ''appears'' that kernels built with <tt>-O</tt> by modifying the kernel's main makefile are ok. A fix is included in 4.7.2.
 === GCC 4.7.0 and 4.7.1 code generation bug ===
-A further code generation bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54494</ref> may also affect the kernel.  As of 2012-09-05 there is a proposed fix for this bug but no release version of GCC incorporates it yet.
+A further code generation bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54494</ref> may also affect the kernel. A fix is included in 4.7.2.
 == External links ==

@@ Line 15: / Line 15: @@
 === GCC 4.7.1 and older code generation bug ===
-A bug in these two compiler versions results in bad code for the kernel in such ways that could be taken for a hardware bug, for example error messages about lost interrupts or similar.  As of 2012-09-05 the status is that apparently the code generation for <tt>__builtin_unreachable()</tt> is broken for MIPS and a fix has been checked in upstream but no releases based on that are out yet.  It ''appears'' that kernels built with <tt>-O</tt> by modifying the kernel's main makefile are ok.  Presumably this is caused by [http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369 GCC bug 54369].
+A bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369</ref> in these two compiler versions results in bad code for the kernel in such ways that could be taken for a hardware bug, for example error messages about lost interrupts or similar.  As of 2012-09-05 the status is that apparently the code generation for <tt>__builtin_unreachable()</tt> is broken for MIPS and a fix has been checked in upstream but no releases based on that are out yet.  It ''appears'' that kernels built with <tt>-O</tt> by modifying the kernel's main makefile are ok.
 === GCC 4.7.0 and 4.7.1 code generation bug ===
-A further code generation bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54494</ref> may also affect the kernel.
+A further code generation bug<ref>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54494</ref> may also affect the kernel.  As of 2012-09-05 there is a proposed fix for this bug but no release version of GCC incorporates it yet.
 == External links ==
@@ Line 25: / Line 25: @@
 * [http://www.nabble.com/gcc-f1154.html GCC Forum] - hosted by [http://www.nabble.com Nabble] archiving all gcc mailing lists into a searchable forum.
 * [http://www.ibm.com/developerworks/linux/library/l-gcc-hacks/ GCC hacks in the Linux kernel]

@@ Line 14: / Line 14: @@
 [[SDE|SDE&nbsp;5]] is based on gcc&nbsp;2.96 and [[SDE|SDE&nbsp;6]] is based on gcc&nbsp;3.4.
-=== GCC 4.7.0 and 4.7.1 code generation bug ===
+=== GCC 4.7.1 and older code generation bug ===
 A bug in these two compiler versions results in bad code for the kernel in such ways that could be taken for a hardware bug, for example error messages about lost interrupts or similar.  As of 2012-09-05 the status is that apparently the code generation for <tt>__builtin_unreachable()</tt> is broken for MIPS and a fix has been checked in upstream but no releases based on that are out yet.  It ''appears'' that kernels built with <tt>-O</tt> by modifying the kernel's main makefile are ok.  Presumably this is caused by [http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369 GCC bug 54369].
 == External links ==

← Older revision		Revision as of 08:17, 5 September 2012
Line 13:		Line 13:

	[[SDE\|SDE 5]] is based on gcc 2.96 and [[SDE\|SDE 6]] is based on gcc 3.4.		[[SDE\|SDE 5]] is based on gcc 2.96 and [[SDE\|SDE 6]] is based on gcc 3.4.
		+
		+	=== GCC 4.7.0 and 4.7.1 code generation bug ===
		+	A bug in these two compiler versions results in bad code for the kernel in such ways that could be taken for a hardware bug, for example error messages about lost interrupts or similar. As of 2012-09-05 the status is that apparently the code generation for <tt>__builtin_unreachable()</tt> is broken for MIPS and a fix has been checked in upstream but no releases based on that are out yet. It ''appears'' that kernels built with <tt>-O</tt> by modifying the kernel's main makefile are ok. Presumably this is caused by [http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369 GCC bug 54369].

	== External links ==		== External links ==

@@ Line 3: / Line 3: @@
 The recommended compiler for [[Kernel_Build|building]] Linux&nbsp;2.4 is gcc&nbsp;2.95.  New compilers upto gcc&nbsp;3.3 have been used successfully to build the kernel however with gcc&nbsp;3.4 there may be problems when certain configurations.  With Linux&nbsp;2.4 being in deep freeze mode we generally don't intend to fix such problems but rather recommend to use an older compiler for the kernel.
-The latest "official" [http://gcc.gnu.org/ GCC 2] is version 2.95.3. The [http://gcc.gnu.org/gcc-2.96.html GCC 2.96] is unofficial massively patched version. It provides more efficient optimization with -O2, more strict syntax checkhing and supports more recent C++ standards. Unfortuntely, C++ ABI is not compatible with "official" 2.95.3 nor 3.0.
+The latest "official" [http://gcc.gnu.org/ GCC 2] is version 2.95.3. The [http://gcc.gnu.org/gcc-2.96.html GCC 2.96] is unofficial massively patched version. It provides more efficient optimization with -O2, more strict syntax checkhing and supports more recent C++ standards. Unfortuntely the C++ ABI is not compatible with "official" 2.95.3 nor 3.0.
 [http://www.redhat.com/advice/speaks_gcc.html Red Hat Speaks on gcc 2.96-RH]

← Older revision		Revision as of 15:15, 12 August 2010
Line 18:		Line 18:
	* [http://www.gnu.org/software/gcc/gcc-3.4/mips-abi.html MIPS ABI Changes in GCC 3.4]		* [http://www.gnu.org/software/gcc/gcc-3.4/mips-abi.html MIPS ABI Changes in GCC 3.4]
	* [http://www.nabble.com/gcc-f1154.html GCC Forum] - hosted by [http://www.nabble.com Nabble] archiving all gcc mailing lists into a searchable forum.		* [http://www.nabble.com/gcc-f1154.html GCC Forum] - hosted by [http://www.nabble.com Nabble] archiving all gcc mailing lists into a searchable forum.
		+	* [http://www.ibm.com/developerworks/linux/library/l-gcc-hacks/ GCC hacks in the Linux kernel]

← Older revision		Revision as of 20:32, 26 February 2008
Line 4:		Line 4:

	The latest "official" [http://gcc.gnu.org/ GCC 2] is version 2.95.3. The [http://gcc.gnu.org/gcc-2.96.html GCC 2.96] is unofficial massively patched version. It provides more efficient optimization with -O2, more strict syntax checkhing and supports more recent C++ standarts. Unfortuntely, C++ ABI is not compatible with "official" 2.95.3 nor 3.0.		The latest "official" [http://gcc.gnu.org/ GCC 2] is version 2.95.3. The [http://gcc.gnu.org/gcc-2.96.html GCC 2.96] is unofficial massively patched version. It provides more efficient optimization with -O2, more strict syntax checkhing and supports more recent C++ standarts. Unfortuntely, C++ ABI is not compatible with "official" 2.95.3 nor 3.0.
		+
		+	[http://www.redhat.com/advice/speaks_gcc.html Red Hat Speaks on gcc 2.96-RH]

	=== Linux 2.6 ===		=== Linux 2.6 ===

@@ Line 7: / Line 7: @@
 === Linux 2.6 ===
 Kernels upto 2.6.15 require a gcc&nbsp;2.95..4.0.  Gcc&nbsp;4.1 is still considered experimental at this point so not recommended where reliability matters.  Kernels newer than 2.6.15 require at least gcc&nbsp;3.2.  See a related article on [http://kerneltrap.org/node/5974 Kerneltrap].
 [[SDE|SDE&nbsp;5]] is based on gcc&nbsp;2.96 and [[SDE|SDE&nbsp;6]] is based on gcc&nbsp;3.4.