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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug modula2/110126] Variables are reported as unused when only
 referenced by ASM statements
Date: Sat, 29 Jul 2023 16:25:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110126

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Gaius Mulley
<gaius@gcc.gnu.org>:

https://gcc.gnu.org/g:3ad40f65a7c89af2f3cb71c06e327ee33a996bd4

commit r13-7644-g3ad40f65a7c89af2f3cb71c06e327ee33a996bd4
Author: Gaius Mulley <gaiusmod2@gmail.com>
Date:   Sat Jul 29 17:24:38 2023 +0100

    PR modula2/110126 variables are reported as unused when referenced by A=
SM

    This patches fixes two problems with the asm statement.
    gm2 -Wall -c fooasm3.mod generates an incorrect warning and
    gm2 cannot concatenate strings before an ASM statement.
    The asm statement now accepts a constant expression (rather than
    a string) and it updates the variable read/write use lists as
    appropriate.

    gcc/m2/ChangeLog:

            PR modula2/110126
            * gm2-compiler/M2GenGCC.mod (BuildTreeFromInterface): Remove
            tokenno parameter.  Use object tok instead of tokenno.
            (BuildTrashTreeFromInterface): Use object tok instead of
            GetDeclaredMod.
            (CodeInline): Remove tokenno from parameter list to
BuildTreeFromInterface.
            * gm2-compiler/M2Quads.def (BuildAsmElement): Exported and
            defined.
            * gm2-compiler/M2Quads.mod (BuildOptimizeOff): Reformatted.
            (BuildInline): Reformatted.
            (BuildLineNo): Reformatted.
            (UseLineNote): Reformatted.
            (BuildAsmElement): New procedure.
            * gm2-compiler/P0SyntaxCheck.bnf (AsmOperands): Use
            ConstExpression instead of string.
            (AsmElement): Use ConstExpression instead of string.
            (TrashList): Use ConstExpression instead of string.
            * gm2-compiler/P1Build.bnf (AsmOperands): Use
            ConstExpression instead of string.
            (AsmElement): Use ConstExpression instead of string.
            (TrashList): Use ConstExpression instead of string.
            * gm2-compiler/P2Build.bnf (AsmOperands): Use
            ConstExpression instead of string.
            (AsmElement): Use ConstExpression instead of string.
            (TrashList): Use ConstExpression instead of string.
            * gm2-compiler/P3Build.bnf (AsmOperands): Rewrite.
            (AsmOperandSpec): Rewrite.
            (AsmOutputList): New rule.
            (AsmInputList): New rule.
            (TrashList): Rewrite.
            * gm2-compiler/PCBuild.bnf (AsmOperands): Use
            ConstExpression instead of string.
            (AsmElement): Use ConstExpression instead of string.
            (TrashList): Use ConstExpression instead of string.
            * gm2-compiler/PHBuild.bnf (AsmOperands): Use
            ConstExpression instead of string.
            (AsmElement): Use ConstExpression instead of string.
            (TrashList): Use ConstExpression instead of string.
            * gm2-compiler/SymbolTable.def (PutRegInterface):
            Rewrite interface.
            (GetRegInterface): Rewrite interface.
            * gm2-compiler/SymbolTable.mod (SetFirstUsed): New procedure.
            (PutFirstUsed): New procedure.
            (PutRegInterface): Rewrite.
            (GetRegInterface): Rewrite.

    gcc/testsuite/ChangeLog:

            PR modula2/110126
            * gm2/pim/pass/fooasm3.mod: New test.

    (cherry picked from commit 990d10ab23360fef8b5eb6937ac10b4f67f46e2d)

    Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>=