Re: [PATCH 2/7] x86: Add an option to compile with -ffunction-sections-fdata-sections

[Anders Kaseorg]

On Wed, 4 Feb 2009, Rusty Russell wrote:
> Ah, OK, this explanation should probably be in a paragraph in the Kconfig
> help message, rather than hiding on lkml.

Sure.

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c6a2674..3412706 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -602,6 +602,11 @@ config FUNCTION_DATA_SECTIONS
 	  If you say Y here the compiler will give each function
 	  and data structure its own ELF section.

+	  This option conflicts with CONFIG_FUNCTION_TRACER, which
+	  enables profiling code generation, because current GCC does
+	  not support compiling with -ffunction-sections -pg (see
+	  <http://gcc.gnu.org/ml/gcc-help/2008-11/msg00128.html>).
+
 	  If unsure, say N.

 config BOOT_PRINTK_DELAY
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