[Bug c++/98805] New: exception abort on mac os 11 (big sur)

[Bug c++/98805] New: exception abort on mac os 11 (big sur)

[hanicka at hanicka dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

            Bug ID: 98805
           Summary: exception abort on mac os 11 (big sur)
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hanicka at hanicka dot net
  Target Milestone: ---

Any C++ code I try to compile with GCC 10.2.0 (homebrew package AND build from
source) aborts when exception is thrown even when the exception should caught.

This minimal example aborts:

```
struct exception { };

int main() {
        try {
                throw exception{};
        } catch (exception) {

        } catch (...) {

        }
}
```
(Build with g++ exception.cpp && ./a.out)

My GCC build is:
```
Using built-in specs.
COLLECT_GCC=/usr/local/gcc-10.2/bin/g++-10.2
COLLECT_LTO_WRAPPER=/usr/local/gcc-10.2/libexec/gcc/x86_64-apple-darwin20.2.0/10.2.0/lto-wrapper
Target: x86_64-apple-darwin20.2.0
Configured with: ../gcc-10.2.0/configure --prefix=/usr/local/gcc-10.2
--enable-checking=release --enable-languages=c,c++ --disable-multilib
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
--program-suffix=-10.2
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC) 
```

Backtrace of the binary when crashes is:
```
  * frame #0: 0x00007fff20347462 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff20375610 libsystem_pthread.dylib`pthread_kill + 263
    frame #2: 0x00007fff202c8720 libsystem_c.dylib`abort + 120
    frame #3: 0x000000010048b00a libgcc_s.1.dylib`uw_init_context_1.cold + 5
    frame #4: 0x0000000100488475
libgcc_s.1.dylib`_Unwind_RaiseException(exc=0x0000000100505760) at
unwind.inc:93:3
    frame #5: 0x00000001001382f7 libstdc++.6.dylib`__cxa_throw + 55
    frame #6: 0x0000000100003f13 a.out`main at exception.cpp:5:19
    frame #7: 0x00007fff20390621 libdyld.dylib`start + 1
```

[Bug c++/98805] exception abort on mac os 11 (big sur)

[hanicka at hanicka dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

--- Comment #1 from Hana Dusíková <hanicka at hanicka dot net> ---
I found out that build done on Catalina generates correct binary, which is able
to run on Big Sur without any problem.

[Bug c++/98805] exception abort on mac os 11 (big sur)

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
Hi Hana ..

There are some changes needed on the 10.x branch to cater for macOS 11.

Trying to ensure that we get them in before 10.3 is released.  In the meantime,
I'll discuss with the home-brew folks about other strategies.

Failing that I can push my work in progress for the branch somewhere and you
can build that.

Iain

[Bug c++/98805] exception abort on mac os 11 (big sur)

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fxcoudert at gcc dot gnu.org

--- Comment #3 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
On macOS Big Sur Intel, Homebrew builds gcc-10 from the 10.2 release sources
(https://ftp.gnu.org/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.xz) with one extra patch
at
https://raw.githubusercontent.com/Homebrew/formula-patches/7baf6e2f/gcc/bigsur.diff
(which is basically Iain's commit at
https://github.com/iains/gcc-darwin-arm64/commit/556ab512)

The compiler is build with:

```
../configure --build=x86_64-apple-darwin20
--prefix=/usr/local/Cellar/gcc/10.2.0_2
--libdir=/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10 --disable-nls
--enable-checking=release --enable-languages=c,c++,objc,obj-c++,fortran
--program-suffix=-10 --with-gmp=/usr/local/opt/gmp
--with-mpfr=/usr/local/opt/mpfr --with-mpc=/usr/local/opt/libmpc
--with-isl=/usr/local/opt/isl --with-system-zlib --with-pkgversion='Homebrew
GCC 10.2.0_2' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--disable-multilib --with-native-system-header-dir=/usr/include
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
SED=/usr/bin/sed
```

We've always done it that way, the only recent change to that is pretty much
that we use the unversioned symlink
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk instead of the versioned
directory (/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk) because
since Big Sur, Apple is labelling their SDK with minor version numbers and that
breaks for people who don't have the same exact version of the command-line
developer tools.

[Bug c++/98805] exception abort on mac os 11 (big sur)

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-01-24
             Status|UNCONFIRMED                 |NEW

--- Comment #4 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
And I can confirm the crash on my own system, with the same stack backtrace.

[Bug c++/98805] exception abort on mac os 11 (big sur)

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

--- Comment #5 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
Here is what g++-10 -v gives during compilation:

rmeur /tmp $ g++-10 a.cpp -v                                    
Using built-in specs.
COLLECT_GCC=g++-10
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/10.2.0_2/libexec/gcc/x86_64-apple-darwin20/10.2.0/lto-wrapper
Target: x86_64-apple-darwin20
Configured with: ../configure --build=x86_64-apple-darwin20
--prefix=/usr/local/Cellar/gcc/10.2.0_2
--libdir=/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10 --disable-nls
--enable-checking=release --enable-languages=c,c++,objc,obj-c++,fortran
--program-suffix=-10 --with-gmp=/usr/local/opt/gmp
--with-mpfr=/usr/local/opt/mpfr --with-mpc=/usr/local/opt/libmpc
--with-isl=/usr/local/opt/isl --with-system-zlib --with-pkgversion='Homebrew
GCC 10.2.0_2' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--disable-multilib --with-native-system-header-dir=/usr/include
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
SED=/usr/bin/sed
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (Homebrew GCC 10.2.0_2) 
COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=11.0.0'
'-asm_macosx_version_min=11.0' '-shared-libgcc' '-mtune=core2'

/usr/local/Cellar/gcc/10.2.0_2/libexec/gcc/x86_64-apple-darwin20/10.2.0/cc1plus
-quiet -v -D__DYNAMIC__ a.cpp -fPIC -quiet -dumpbase a.cpp
-mmacosx-version-min=11.0.0 -mtune=core2 -auxbase a -version -o
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//ccf7qnt5.s
GNU C++14 (Homebrew GCC 10.2.0_2) version 10.2.0 (x86_64-apple-darwin20)
        compiled by GNU C version 10.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.23-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/local/include"
ignoring nonexistent directory
"/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../../../../../x86_64-apple-darwin20/include"
ignoring nonexistent directory
"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:

/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../../../../../include/c++/10.2.0

/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../../../../../include/c++/10.2.0/x86_64-apple-darwin20

/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../../../../../include/c++/10.2.0/backward

/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/include

/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/include-fixed
 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks
End of search list.
GNU C++14 (Homebrew GCC 10.2.0_2) version 10.2.0 (x86_64-apple-darwin20)
        compiled by GNU C version 10.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.23-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 226b82c9217faee57636048830034c6a
COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=11.0.0'  '-shared-libgcc'
'-mtune=core2'
 as -arch x86_64 -v -force_cpusubtype_ALL -mmacosx-version-min=11.0 -o
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//cclYOyAu.o
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//ccf7qnt5.s
Apple clang version 12.0.0 (clang-1200.0.32.28)
Target: x86_64-apple-darwin20.2.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
-cc1as -triple x86_64-apple-macosx11.0.0 -filetype obj -main-file-name
ccf7qnt5.s -target-cpu penryn -fdebug-compilation-dir /tmp
-dwarf-debug-producer "Apple clang version 12.0.0 (clang-1200.0.32.28)"
-dwarf-version=4 -mrelocation-model pic -o
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//cclYOyAu.o
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//ccf7qnt5.s
COMPILER_PATH=/usr/local/Cellar/gcc/10.2.0_2/libexec/gcc/x86_64-apple-darwin20/10.2.0/:/usr/local/Cellar/gcc/10.2.0_2/libexec/gcc/x86_64-apple-darwin20/10.2.0/:/usr/local/Cellar/gcc/10.2.0_2/libexec/gcc/x86_64-apple-darwin20/:/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/:/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/
LIBRARY_PATH=/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/:/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../../
COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=11.0.0'  '-shared-libgcc'
'-mtune=core2'

/usr/local/Cellar/gcc/10.2.0_2/libexec/gcc/x86_64-apple-darwin20/10.2.0/collect2
-syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/ -dynamic -arch
x86_64 -macosx_version_min 11.0.0 -weak_reference_mismatches non-weak -o a.out
-L/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0
-L/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../..
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//cclYOyAu.o -lstdc++ -lSystem
-lgcc_ext.10.5 -lgcc -lSystem -no_compact_unwind -v
collect2 version 10.2.0
/usr/bin/ld -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/
-dynamic -arch x86_64 -macosx_version_min 11.0.0 -weak_reference_mismatches
non-weak -o a.out
-L/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0
-L/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../..
/var/folders/h8/9hx_fyj91053ksgdzb2w03vw0000gp/T//cclYOyAu.o -lstdc++ -lSystem
-lgcc_ext.10.5 -lgcc -lSystem -no_compact_unwind -v
@(#)PROGRAM:ld  PROJECT:ld64-609.8
BUILD 20:09:52 Nov  4 2020
configured to support archs: armv6 armv7 armv7s arm64 arm64e arm64_32 i386
x86_64 x86_64h armv6m armv7k armv7m armv7em
Library search paths:
       
/usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0
        /usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10
        /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib
Framework search paths:
       
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/

[Bug c++/98805] exception abort on mac os 11 (big sur)

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
thanks FX..

That single patch is definitely "necessary, but not sufficient".

.. AFAIK, the critical patches have been already applied to the 10.x branch
(there were several) - but I'll run a check on macOS 11 with the current branch
- and then short-list what you need to fix it...

[Bug c++/98805] exception abort on mac os 11 (big sur)

[awsteiner at utk dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

awsteiner at utk dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |awsteiner at utk dot edu

--- Comment #7 from awsteiner at utk dot edu ---
*** Bug 98812 has been marked as a duplicate of this bug. ***

[Bug c++/98805] exception abort on mac os 11 (big sur)

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98805

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |10.3
             Status|NEW                         |RESOLVED

--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #6)
> thanks FX..
> 
> That single patch is definitely "necessary, but not sufficient".
> 
> .. AFAIK, the critical patches have been already applied to the 10.x branch
> (there were several) - but I'll run a check on macOS 11 with the current
> branch - and then short-list what you need to fix it...


current 10.x branch "works for me" ... homebrew might want to consider these:

c85bc938ccf Darwin : Update libtool and dependencies for Darwin20 [PR97865]
7b19b6b1536 Darwin, libsanitizer : Support libsanitizer for x86_64-darwin20.
82abd13fb66 Darwin : Adjust handling of MACOSX_DEPLOYMENT_TARGET for macOS 11.
f5ee16a0d8e Darwin : Update the kernel version to macOS version mapping.
24957662c67 Darwin: Darwin 20 is to be macOS 11 (Big Sur).
d0bae0b218d Darwin: Adjust the PCH area to allow for 16384byte page size.
(optional) e731714eb2b libobjc, Darwin : Fix powerpc encoding regression.
(optional) c1d7709ec68 Darwin, libgfortran : Do not use environ directly from
the library.

This is fixed for the next release (we discussed making a special, but I'd say
the effort of a darwin-specific release now probably doesn't warrant it - 10.3
is probably a month or so away).  Better just to update the band-aid (and note
that it's also needed for any other 10.x back ports).