[Bug dynamic-link/21041] IFUNC setjmp/longjmp in libpthread.so are unsafe

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21041

--- Comment #16 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 9782
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9782&action=edit
A testcase

[hjl@gnu-6 pr21041d]$ make
gcc -O2   -c -o main.o main.c
gcc -O2 -fPIC   -c -o foo.o foo.c
gcc -O2   -c -o bar1.o bar1.c
gcc -shared -Wl,--soname=libbar.so -o libbar1.so bar1.o
-Wl,--version-script=libbar.map
gcc -shared -o libfoo.so foo.o libbar1.so
gcc -O2   -c -o xxx.o xxx.c
gcc -shared -o libxxx.so xxx.o -Wl,--version-script=libbar.map
gcc -o x main.o libfoo.so libbar1.so libxxx.so -Wl,-rpath,.
gcc -O2   -c -o bar2.o bar2.c
gcc -shared -Wl,--soname=libbar.so -o libbar2.so bar2.o
-Wl,--version-script=libbar.map
ln -sf libbar1.so libbar.so
./x
ln -sf libbar2.so libbar.so
./x
./x: relocation error: ./libfoo.so: symbol bar1, version BAR not defined in
file libbar.so with link time reference
Makefile:12: recipe for target 'all' failed
make: *** [all] Error 127
[hjl@gnu-6 pr21041d]$

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