[Bug ld/20882] GNU ld discards sections required by relocations in .debug_info with --gc-sections

[rguenth at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=20882

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue persists in 2.29.1 at least.

Index: libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp
===================================================================
--- libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp 
(revision 258481)
+++ libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp 
(working copy)
@@ -50,7 +50,7 @@ gdb-dg-runtest [lsort [glob $srcdir/$sub
 if { [check_effective_target_lto] } {
   append cxxflags " -flto"
   # work around sourceware.org 20882
-  regsub {^(.*)-Wl,--gc-sections(.*)$} $cxxldflags {\1\2} cxxldflags
+  #regsub {^(.*)-Wl,--gc-sections(.*)$} $cxxldflags {\1\2} cxxldflags
   gdb-dg-runtest [lsort [glob $srcdir/$subdir/*.cc]] \
     "" "$DEFAULT_CXXFLAGS -flto $PCH_CXXFLAGS"
 }

shows the issue in a gcc tree with

> make check-target-libstdc++-v3 RUNTESTFLAGS="prettyprinters.exp"

you then get UNSUPPORTED tests with complaints like

spawn gdb -nx -nw -quiet -batch -x cxx11.gdb^M
Dwarf Error: could not find abbrev number 151 [in module
/tmp/obj/x86_64-pc-linux-gnu/libstdc++-v3/testsuite/cxx11.exe]^M
skipping: Dwarf Error: could not find abbrev number 151 [in module
/tmp/obj/x86_64-pc-linux-gnu/libstdc++-v3/testsuite/cxx11.exe]^M
cxx11.gdb:5: Error in sourced command file:^M
No symbol table is loaded.  Use the "file" command.^M
skipping: cxx11.gdb:5: Error in sourced command file:^M
skipping: No symbol table is loaded.  Use the "file" command.^M
UNSUPPORTED: libstdc++-prettyprinters/cxx11.cc

See also https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84847

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