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D.gnu - [Bug 148] New: gcc inline asm instruction template must be a

Date: Sat, 9 Aug 2014 15:12:49 +0100
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            Bug ID: 148
           Summary: gcc inline asm instruction template must be a constant
                    char string regression
           Product: GDC
           Version: 4.9.x
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gdc
          Assignee: ibuclaw gdcproject.org
          Reporter: art.08.09 gmail.com

void main() {
   asm {""~"" ; } // => instruction template must be a constant char string

Just tried to recompile some programs that used to build with an old GDC
version, and found this. It's a regression; at least string concatenation used
to work w/ 'gdc 0.31 - r748:ab99d67f04c2, using dmd 2.057'. Now it seems the
compiler doesn't like anything other than a string literal. Which means that
generating asms inside templates, based on type and size became impossible, at
least directly. (The original code that triggered this was selecting op
suffixes based on size)

Would it be possible to accept any expression that can be evaluated at CT and
returns a string? Eg

   enum E = ""~"";
   asm {E ; }  // => unimplemented: D inline assembler statements are not
supported in GDC.
   asm {mixin(""~"") ; } // ditto

(These two did NOT work previously, so this, unlike the example above, would be
an enhancement)

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Aug 09 2014