linker error with gcc flag -mfunction-return=thunk

Michael Haubenwallner
Mon Jun 25 12:41:00 GMT 2018


I'm encountering a package's configure script (openssh-7.7p1) that
successfully tests for the compiler flag "-mfunction-return=thunk",
which causes subsequent linker errors (and fails to identify zlib):
 relocation truncated to fit: R_X86_64_32S against `.text'

The compiler used is gcc-7.3.0 with binutils- (current),
and the easiest test case here is:

$ echo 'int main() { return 0; }' > conftest.c
$ gcc -mfunction-return=thunk conftest.c
/tmp/ccv1Ird0.o:conftest.c:(.text+0x1a): relocation truncated to fit: R_X86_64_32S against `.text'
collect2: error: ld returned 1 exit status

Not sure though where to finally report this problem:
* openssh, as they should do a link-test rather than compile-test
* gcc, as their generated code is wrong for cygwin
* binutils, as their ld is unable to link that code
* cygwin, as the maintainers of cygwin support in binutils+gcc

After all, openssh-7.7p1-1.src cygwin package currently fails to compile.


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