r227907 had the following change:
Index: aix61.h
===================================================================
--- aix61.h (revision 227906)
+++ aix61.h (revision 227907)
@@ -167,7 +167,7 @@
%{!maix64:\
%{pthread:%{pg:gcrt0_r%O%s}%{!pg:%{p:mcrt0_r%O%s}%{!p:crt0_r%O%s}}}\
%{!pthread:%{pg:gcrt0%O%s}%{!pg:%{p:mcrt0%O%s}%{!p:crt0%O%s}}}}}\
- %{shared:crtcxa_s%O%s;:crtcxa%O%s}"
+ %{shared:crtcxa_s%O%s;:crtcxa%O%s} crtdbase%O%s"
/* AIX V5 typedefs ptrdiff_t as "long" while earlier releases used "int". */
In trying to build gcc-8.1.0 on AIX 5.3 (cf. PR86553), I looked at how
libgcc_s.a was built and, on AIX 6 and 7, crtdbase was linked in,
providing __gcc_unwind_dbase (and crtcxa_s for __dso_handle). However,
on AIX 5.3, this file is never included because
gcc/config/rs6000/aix53.h has:
#undef STARTFILE_SPEC
#define STARTFILE_SPEC "%{!shared:\
%{maix64:%{pg:gcrt0_64%O%s}%{!pg:%{p:mcrt0_64%O%s}%{!p:crt0_64%O%s}}}\
%{!maix64:\
%{pthread:%{pg:gcrt0_r%O%s}%{!pg:%{p:mcrt0_r%O%s}%{!p:crt0_r%O%s}}}\
%{!pthread:%{pg:gcrt0%O%s}%{!pg:%{p:mcrt0%O%s}%{!p:crt0%O%s}}}}}"
A patch similar to the above must also be made to aix53.h for 8.1.0 to
build successfully on AIX 5.3. At the moment, GCC 5+ doesn't build on
AIX 5.3 because of the above.
--
albert chin (ch...@thewrittenword.com)
