[Bug lto/84847] [8 Regression] Incompatibility between early LTO debug and "-Wl,--gc-sections" leads to corrupt DWARF debuginfo

[hjl.tools at gmail dot com]

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

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to rguent...@suse.de from comment #6)
> 
> make check-target-libstdc++-v3 RUNTESTFLAGS="prettyprinters.exp"

I tried:

diff --git a/libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp
b/libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp
index c51b1ffb21c..fab6ef11947 100644
--- a/libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp
+++ b/libstdc++-v3/testsuite/libstdc++-prettyprinters/prettyprinters.exp
@@ -47,14 +47,6 @@ global PCH_CXXFLAGS
 gdb-dg-runtest [lsort [glob $srcdir/$subdir/*.cc]] \
   "" "$DEFAULT_CXXFLAGS $PCH_CXXFLAGS"

-if { [check_effective_target_lto] } {
-  append cxxflags " -flto"
-  # work around sourceware.org 20882
-  regsub {^(.*)-Wl,--gc-sections(.*)$} $cxxldflags {\1\2} cxxldflags
-  gdb-dg-runtest [lsort [glob $srcdir/$subdir/*.cc]] \
-    "" "$DEFAULT_CXXFLAGS -flto $PCH_CXXFLAGS"
-}
-
 if [info exists guality_gdb_name] {
     unsetenv GUALITY_GDB_NAME
 }

> with binutils master and the prettyprinters.exp hack removed?

                === libstdc++ Summary ===

# of expected passes            140

> Do you know what fixed it on master?

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b7c871edcd83ccdc5fcd8148a7f433efd6b52255