Talk:Libgcc without red zone: Difference between revisions
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(note that CFLAGS_FOR_TARGET is the supported method) |
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== For a userland-less GCC, isn't this normally done with <code>CFLAGS_FOR_TARGET</code>? == |
== For a userland-less GCC, isn't this normally done with <code>CFLAGS_FOR_TARGET</code>? == |
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Given that a <code>x86_64-pc-elf</code> GCC is mostly useless for userland programming (without -mno-red-zone), shouldn't it just be built with <code>CFLAGS_FOR_TARGET=-mno-red-zone</code>? See this gcc-help posting: [https://gcc.gnu.org/ml/gcc-help/2011-07/msg00158.html]. Also, it'd be interesting to know how this is achieved in Linux, *BSD, &c. kernels that are built with a conventional userland compiler and don't have (?) a special libgcc. |
Given that a <code>x86_64-pc-elf</code> GCC is mostly useless for userland programming (without -mno-red-zone), shouldn't it just be built with <code>CFLAGS_FOR_TARGET=-mno-red-zone</code>? See this gcc-help posting: [https://gcc.gnu.org/ml/gcc-help/2011-07/msg00158.html]. Also, it'd be interesting to know how this is achieved in Linux, *BSD, &c. kernels that are built with a conventional userland compiler and don't have (?) a special libgcc. --[[User:Alexshpilkin]] (Forgot to sign message) |
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:Thank's for bringing the topic up. I tried <code>CFLAGS_FOR_TARGET</code> (as that flag is documented by gcc) but it's silently ignored when building the <code>crtbegin</code> and <code>crtend</code> objects. Trust me with this. It took about three days to figure out a clean way to get the <code>-mno-redzone</code> to apply to these files. We also had lots of discussion on that topic in #osdev. --[[User:Shirk|Shirk]] 12:00, 23 October 2014 (CDT) |
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Latest revision as of 19:59, 23 October 2014
For a userland-less GCC, isn't this normally done with CFLAGS_FOR_TARGET?
Given that a x86_64-pc-elf GCC is mostly useless for userland programming (without -mno-red-zone), shouldn't it just be built with CFLAGS_FOR_TARGET=-mno-red-zone? See this gcc-help posting: [1]. Also, it'd be interesting to know how this is achieved in Linux, *BSD, &c. kernels that are built with a conventional userland compiler and don't have (?) a special libgcc. --User:Alexshpilkin (Forgot to sign message)
- Thank's for bringing the topic up. I tried
CFLAGS_FOR_TARGET(as that flag is documented by gcc) but it's silently ignored when building thecrtbeginandcrtendobjects. Trust me with this. It took about three days to figure out a clean way to get the-mno-redzoneto apply to these files. We also had lots of discussion on that topic in #osdev. --Shirk 12:00, 23 October 2014 (CDT)