[Bug target/35179] execs crash in shared lib destructor = do_global_dtors_aux

["egallager at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35179

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|i386-pc-solaris2.10         |i386-pc-solaris2.10,
                   |                            |i486-linux-gnu
                 CC|                            |egallager at gcc dot gnu.org

--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Radu Hociung from comment #6)
> Comment on attachment 17939 [details]
> Improved hello-test case showing working and failing command lines, with
> Makefile
> 
> Works as expected:
> gcc -g -o hello-exec hellomain.o -L. -lhello
> 
> Triggers the bug:
> gcc -g -static -o hello-exec-gccbug35179 hellomain.o -shared -L. -lhello -v

Testcase fails to link for me on Darwin due to a difference in linkers:

$ make hello-exec-gccbug35179
/usr/local/bin/gcc -o hellomain.o -c -g hellomain.c 
hellomain.c: In function ‘main’:
hellomain.c:9:2: warning: implicit declaration of function ‘exit’
[-Wimplicit-function-declaration]
  exit(0);
  ^~~~
hellomain.c:9:2: warning: incompatible implicit declaration of built-in
function ‘exit’
hellomain.c:9:2: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
/usr/local/bin/gcc -o hello_.o -g -c -fpic -DPIC hello.c 
/usr/local/bin/gcc -o libhello.so -shared -g hello_.o 
echo Linking with both -static and -shared flags exposes the bug.
Linking with both -static and -shared flags exposes the bug.
/usr/local/bin/gcc -g -static -o hello-exec-gccbug35179 hellomain.o -shared -L.
-lhello -v 
Using built-in specs.
COLLECT_GCC=/usr/local/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i386-apple-darwin9.8.0/8.0.0/lto-wrapper
Target: i386-apple-darwin9.8.0
Configured with: ../configure --disable-werror --disable-werror-always
--enable-languages=c,c++,lto,objc,obj-c++ --enable-stage1-checking=release,rtl
-C --with-system-libunwind --enable-secureplt --enable-frame-pointer
--enable-debug --with-isl --disable-host-shared --enable-maintainer-mode
--disable-default-pie --with-ld64 --without-pic --enable-target-optspace
CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++ AUTOCONF=/usr/local/bin/autoconf
AUTOHEADER=/usr/local/bin/autoheader AUTORECONF=/usr/local/bin/autoreconf
AUTOM4TE=/usr/local/bin/autom4te AUTOSCAN=/usr/local/bin/autoscan
AUTOUPDATE=/usr/local/bin/autoupdate IFNAMES=/usr/local/bin/ifnames
Thread model: posix
gcc version 8.0.0 20170702 (experimental) (GCC) 
COMPILER_PATH=/usr/local/libexec/gcc/i386-apple-darwin9.8.0/8.0.0/:/usr/local/libexec/gcc/i386-apple-darwin9.8.0/8.0.0/:/usr/local/libexec/gcc/i386-apple-darwin9.8.0/:/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0/:/usr/local/lib/gcc/i386-apple-darwin9.8.0/
LIBRARY_PATH=/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0/:/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0/../../../
COLLECT_GCC_OPTIONS='-g' '-static' '-o' 'hello-exec-gccbug35179'  '-L.' '-v'
'-mmacosx-version-min=10.5.8' '-asm_macosx_version_min=10.5' '-mtune=core2'
'-Zdynamiclib'
 /usr/local/libexec/gcc/i386-apple-darwin9.8.0/8.0.0/collect2 -static -dylib
-arch i386 -macosx_version_min 10.5.8 -weak_reference_mismatches non-weak -o
hello-exec-gccbug35179 -ldylib1.10.5.o -L.
-L/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0
-L/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0/../../.. hellomain.o -lhello
-lgcc_eh -lgcc -v -idsym
collect2 version 8.0.0 20170702 (experimental)
/usr/bin/ld -static -dylib -arch i386 -macosx_version_min 10.5.8
-weak_reference_mismatches non-weak -o hello-exec-gccbug35179 -ldylib1.10.5.o
-L. -L/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0
-L/usr/local/lib/gcc/i386-apple-darwin9.8.0/8.0.0/../../.. hellomain.o -lhello
-lgcc_eh -lgcc -v
Apple Computer, Inc. version cctools-698.1~1
ld_classic: incompatible flag -dylib used (must specify "-dynamic" to be used)
collect2: error: ld returned 1 exit status
make: *** [hello-exec-gccbug35179] Error 1
$

Someone running GNU/Linux will have to try the testcase to move this out of
WAITING.