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Date: Wed, 30 Nov 2005 15:52:00 -0000
Subject: [Bug c++/25181]  New: wrong "will never be executed" warning in switch - case block
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From: "oliverst at online dot de" <gcc-bugzilla@gcc.gnu.org>
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The following code will report this:

C:\Dev-Cpp\Projects\test-stlport\main_18.cpp In function `int test_18()': 
13 C:\Dev-Cpp\Projects\test-stlport\main_18.cpp [Warning] will never be
executed 

extern int abort();

int test_18()
{
        int type;
        switch (type)
        {
        case 1:
                int ret = abort();
                if (ret != 0)
                        return 2;

                break;

        case 3:
                break;

        default:                        
                return 1;
        }

        return 0;
}
If you remove "case 3" or "default" the warning will go away.

I already reported something similar under bug 24968.

C:\MinGW_3.4.4\bin>gcc -v
Reading specs from ../lib/gcc/mingw32/3.4.4/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as
--host=
mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls
--enable
-languages=c,c++,f77,ada,objc,java --disable-win32-registry --disable-shared
--e
nable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x
--enable-ja
va-gc=boehm --disable-libgcj-debug --enable-interpreter
--enable-hash-synchroniz
ation --enable-libstdcxx-debug
Thread model: win32
gcc version 3.4.4 (mingw special)


-- 
           Summary: wrong "will never be executed" warning in switch - case
                    block
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: oliverst at online dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25181