From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Wed, 12 Mar 2008 07:09:51 +0100
Subject: [U-Boot-Users] Help with "warning: 'alias' attribute ignored"
In-Reply-To: <47D6FFB0.1070108@freescale.com>
References: <47D6FFB0.1070108@freescale.com>
Message-ID: <20080312060951.GA18968@game.jcrosoft.org>
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To: u-boot@lists.denx.de

On 16:54 Tue 11 Mar     , Timur Tabi wrote:
> I'm trying to write code that uses the "pragma weak" feature of gcc to define a
> global variable that is used only if it isn't defined somewhere else.  I thought
> I had it working, but then I noticed this:
> 
> powerpc-linux-gnu-gcc -g  -Os   -fPIC -ffixed-r14 -meabi -D__KERNEL__
> -DTEXT_BASE=0xFE000000 -I/temp/u-boot.281/include -fno-builtin -ffreestanding
> -nostdinc -isystem
> /opt/freescale/usr/local/gcc-4.2.72-eglibc-2.5.72-1/powerpc-linux-gnu/lib/gcc/powerpc-linux-gnu/4.2.1/include
> -pipe  -DCONFIG_PPC -D__powerpc__ -DCONFIG_MPC83XX -DCONFIG_E300 -ffixed-r2
> -msoft-float -Wall -Wstrict-prototypes -c -o fsl_i2c.o fsl_i2c.c
> fsl_i2c.c: In function 'get_fdr':
> fsl_i2c.c:72: warning: 'alias' attribute ignored
> 
> 
> Here's the code in question, which is in fsl_i2c.c:
> 
replace this
> #pragma weak fsl_i2c_speed_map = default_fsl_i2c_speed_map
> 
> struct fsl_i2c_speed_map default_fsl_i2c_speed_map[] = {
> 	{0, 0x3F}, {-1, 0x3F}
> };

by this

struct fsl_i2c_speed_map fsl_i2c_speed_map[] __attribute__((weak))= {
	{0, 0x3F}, {-1, 0x3F}
};

> static u8 get_fdr(unsigned int i2c_clk, unsigned int speed)
> {
and remove this line
> 	extern struct fsl_i2c_speed_map fsl_i2c_speed_map[];

Best Regards,
J.