Fix PR c++/66590: incorrect warning "reaches end of non-void function" for switch
So the problem here is there is code in the C++ front-end not to add a break statement (to the IR) if the previous block does not fall through. The problem is the code which does the check to see if the block may fallthrough does not check a CLEANUP_STMT; it assumes it is always fall through. Anyways this adds the code for the case of a CLEANUP_STMT that is only for !CLEANUP_EH_ONLY (the try/finally case). OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. gcc/cp/ChangeLog: PR c++/66590 * cp-objcp-common.c (cxx_block_may_fallthru): Handle CLEANUP_STMT for the case which will be try/finally. gcc/testsuite/ChangeLog: PR c++/66590 * g++.dg/warn/Wreturn-5.C: New test.
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@ -317,6 +317,15 @@ cxx_block_may_fallthru (const_tree stmt)
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return true;
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return block_may_fallthru (ELSE_CLAUSE (stmt));
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case CLEANUP_STMT:
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/* Just handle the try/finally cases. */
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if (!CLEANUP_EH_ONLY (stmt))
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{
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return (block_may_fallthru (CLEANUP_BODY (stmt))
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&& block_may_fallthru (CLEANUP_EXPR (stmt)));
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}
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return true;
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default:
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return c_block_may_fallthru (stmt);
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}
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@ -0,0 +1,15 @@
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// PR C++/66590
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// { dg-do compile }
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// { dg-options "-Wall" }
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struct A{ ~A();};
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int f(int x)
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{
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A a;
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switch (x)
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{
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case 1: { A tmp; return 1; } break;
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default: return 0;
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}
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} // { dg-bogus "control reaches end of non-void function" }
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