From e2b6021630a00e5acc0487a779b25e6701c344d0 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Fri, 13 Dec 2024 05:56:41 +0800
Subject: [PATCH] fixes #22101; std/pegs with nim cpp --mm:orc
 --exceptions:goto creates invalid C++ (#24531)

fixes #22101

The old implementation generates

`auto T = value;` for the cpp backend which causes problems for goto
exceptions. This PR puts the declaration of `T` to the cpsLocals parts
and makes it compatible with goto exceptions.

(cherry picked from commit f7a461a30cfb2e1800ff63865a5b8f6c498f48a1)
---
 compiler/ccgcalls.nim  | 2 +-
 tests/stdlib/tpegs.nim | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/compiler/ccgcalls.nim b/compiler/ccgcalls.nim
index 788f7a470b..0bf16ba9f8 100644
--- a/compiler/ccgcalls.nim
+++ b/compiler/ccgcalls.nim
@@ -135,7 +135,7 @@ proc fixupCall(p: BProc, le, ri: PNode, d: var TLoc,
           d.snippet = pl
           excl d.flags, lfSingleUse
         else:
-          if d.k == locNone and p.splitDecls == 0:
+          if d.k == locNone and p.splitDecls == 0 and p.config.exc != excGoto:
             d = getTempCpp(p, typ.returnType, pl)
           else:
             if d.k == locNone: d = getTemp(p, typ.returnType)
diff --git a/tests/stdlib/tpegs.nim b/tests/stdlib/tpegs.nim
index da3fc14b7b..0c1fe1ef32 100644
--- a/tests/stdlib/tpegs.nim
+++ b/tests/stdlib/tpegs.nim
@@ -1,5 +1,5 @@
 discard """
-  matrix: "--mm:refc; --mm:orc"
+  matrix: "--mm:refc; --mm:orc; --exceptions:goto"
   targets: "c cpp js"
   output: '''
 PEG AST traversal output