https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64919
John Buddery <jvb at cyberscience dot com> changed:
What |Removed |Added
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CC| |jvb at cyberscience dot com
--- Comment #6 from John Buddery <jvb at cyberscience dot com> ---
I had this issue as well, and here is the solution I used in case anyone is
still interested. I believe it is caused by an HP-UX linker bug, the same one
described by this comment and workaround in config/ia64/hpux.h:
/* The HP-UX linker has a bug that causes calls from functions in
.text.unlikely to functions in .text to cause a segfault. Until
it is fixed, prevent code from being put into .text.unlikely or
.text.hot. */
#define TARGET_ASM_FUNCTION_SECTION ia64_hpux_function_section
While this workaround is sufficient for C code, unfortunately g++ can use
multiple text sections for various different reasons when compiling c++ code
(lookup Vague Linkage for details).
This means g++ is broken on HP ia64, and gcc 4.8.0 build using g++, which is
why the bootstrap now fails.
The workaround I applied was to add the line:
#undef MAKE_DECL_ONE_ONLY
to gcc/config/ia64/hpux.h, below the lines I referenced above. This seems to
prevent gcc from using .linkonce.t sections, and keeps the HP-UX linker happy.
I've no idea if this is the correct solution, but it does produce a working
g++.
Unfortunately just applying this edit you your 4.9.2 sources and building isn't
good enough, because it's your existing broken g++ which does the stage1 build.
As far as I can tell all g++ versions available for download are broken, so you
have to first download and build 4.7.4 or earlier, applying the same
gcc/config/ia64/hpux.h as above. This version builds with gcc, not g++, so the
bootstrap isn't a problem. Once you have a fixed 4.7.4 g++, you can then use
that to bootstrap 4.9.2 - after again apply the hpux.h edit to the 4.9.2
sources.
In my case when building 4.9.2 I also had to disable libgomp, but I think
that's a different issue.
Of course a much better solution to all this would be to get a fixed HP linker;
but I can't even tell if any of the HP patches help as they don't seem to make
these fixes generally available.
