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Re: A tricky problem

From: Xi Ruoyao <ryxi at stu dot xidian dot edu dot cn>
To: yiliang chen <chenyiliangex at gmail dot com>, gcc-help at gcc dot gnu dot org
Cc: ryxi at stu dot xidian dot edu dot cn
Date: Wed, 02 May 2018 19:26:56 +0800
Subject: Re: A tricky problem
References: <CAGvurTLGMLX0i2-Rp+Qn9s_Dv9S5J2rcMV_BgYWWkMm2rGt8sA@mail.gmail.com>

On 2018-05-02 18:47 +0800, yiliang chen wrote:
> hi, When I compile Gcc with MSYS2 on Windows.I have encountered a thorny
> issue.
> 
> In order to output the Intel assembly file by default, I modified the
> gcc/config/i386/i386.opt file as follows
> 
> masm=
> Target RejectNegative Joined Enum(asm_dialect) Var(ix86_asm_dialect)
> Init(ASM_INTEL)
> Use given assembler dialect.
> 
> however, An error occurred when compiling to
> libgcc/config/i386/sfp-exceptions.c
> file， it tell me :
> 
> C:\MSYS\MSYS32\tmp\cctIKXUx.s: Assembler messages:
> C:\MSYS\MSYS32\tmp\cctIKXUx.s:69: Error: no such instruction: `fdivs DWORD
> PTR [esp]'
> C:\MSYS\MSYS32\tmp\cctIKXUx.s:135: Error: no such instruction: `fdivs DWORD
> PTR [esp]'
> 
> I checked Intel's developer's manual，I can't find a description of this
> directive. So I want to know what's going on.

"fdivs" should be "fdiv" in intel dialect.

This instruction is in an inline assembly statement
(libgcc/config/i386/sfp-exceptions.c:103).  GCC don't know how to convert it
to Intel dialect.

Try to modify GCC building system, add "-masm=att" in bootstrapping.
-- 
Xi Ruoyao <ryxi@stu.xidian.edu.cn>
School of Aerospace Science and Technology, Xidian University

References:
- A tricky problem
  - From: yiliang chen

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