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From: "mario_grgic at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105599] New: g++ binary: undefined symbols _main referenced
 from __start in crt1.0
Date: Fri, 13 May 2022 21:06:29 +0000
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X-Bugzilla-Version: 12.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105599

            Bug ID: 105599
           Summary: g++ binary: undefined symbols _main referenced from
                    __start in crt1.0
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mario_grgic at hotmail dot com
  Target Milestone: ---

I have compiled gcc 12.1.0 from source on macOS 10.15.7 (Catalina) with XCo=
de
12.1. I used the following configuration:

```
../configure --prefix=3D/usr/local --with-gmp=3D/usr/local --with-mpfr=3D/u=
sr/local
--with-mpc=3D/usr/local --with-isl-prefix=3D/usr/local --with-cloog=3D/usr/=
local
--enable-checking=3Drelease --enable-languages=3Dc,c++,fortran
--with-sysroot=3D/Applications/Xcode.app/Contents/Developer/Platforms/MacOS=
X.platform/Developer/SDKs/MacOSX.sdk
--with-system-zlib --with-zsstd=3D/usr/local --disable-multilib --disable-n=
ls=20

```

Everything builds and installs correctly. gcc and other binaries work, howe=
ver
invoking g++ without any arguments produces

```
$ /usr/local/bin/g++
Undefined symbols for architecture x86_64:
  "_main", referenced from:
      __start in crt1.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
```

Note that g++ works correctly and compiles and produces working binaries wh=
en
invoked with correct arguments.

Similar thing happens with c++ binary.=