ARM GNU compiler switch

Kiung Chung Wong

Hi,

I am using the GNU compiler for ARM core in TI OMAP L138 which is ARM926EJ-S.

Thus, I set the compiler switch -mcpu=arm926ej-s. What is the corresponding value for -march ?

Normal 0 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4

I look at the document in the compiler installation folder, below is my choice, but I don’t know which one is corresponding to “arm926ej-s” ?

Permissible names are: ‘armv2’, ‘armv2a’, ‘armv3’, ‘armv3m’, ‘armv4’,

‘armv4t’, ‘armv5’, ‘armv5t’, ‘armv5te’, ‘armv6’, ‘armv6j’, ‘armv6t2’, ‘armv6z’,

‘armv6zk’, ‘armv7’, ‘armv7-a’, ‘armv7-r’, ‘armv7-m’, ‘iwmmxt’, ‘ep9312’.

rgds,

kc Wong

over 15 years ago

0 Jeff L over 15 years ago

TI__Expert 5960 points

Hi,

The arm926ej-s corresponds to the armv5te architecture.

Here is a link to an arm web page: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471a/BABDGJDJ.html

0 Kiung Chung Wong over 15 years ago in reply to Jeff L

Expert 2110 points

Jeff,

Thanks for reply.

The reason I am asking is because I always see the below compiler warning even when I specify -march=armv5te as suggested.

warning: switch -mcpu=arm926ej-s conflicts with -march= switch

I am now checking with the compiler vendor about this.

rgds,

kc Wong

0 Jeff L over 15 years ago in reply to Kiung Chung Wong

TI__Expert 5960 points

Kc,

Just curious as to which compiler you are using. I tried a simple test with the codesourcery toolchain and I don't see this warning. Can you post your findings back out here so others can benefit from this thread.

Regards,

0 Kiung Chung Wong over 15 years ago in reply to Jeff L

Expert 2110 points

Jeff,

I am using the ARM GNU tool chain provided by Wind River.

According to the support, the warning "warning: switch -mcpu=arm926ej-s conflicts with -march= swich" that I am getting is a bug in the compiler, but it can be ignored. Anyway they will fix it.

rgds,

kc Wong

Processors

Processors forum

ARM GNU compiler switch