Public bug reported:
Invalid assembly code is generated when intel syntax (-masm=intel) is
used and there are any symbols of the same name as CPU register. For
example:
int ST = 42;
int main() {
return ST;
}
Will produce messages like:
/tmp/ccglHDgh.s: Assembler messages:
/tmp/ccglHDgh.s:21: Error: invalid use of register
The problem is that GCC will generate nonsense like that:
mov eax, DWORD PTR ST[rip]
In case of such trivial example, it is very easy to find what the
problem is but it can be really tricky to find the cause in larger
projects. I expect that the compiler should at least generate some clear
warning that using such names can cause problems.
** Affects: gcc-5 (Ubuntu)
Importance: Undecided
Status: New
** Tags: assembly gcc intel
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https://bugs.launchpad.net/bugs/1560686
Title:
Invalid assembly is generated when using intel syntax
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