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From: "kclifford at tranaptic dot ca" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100947] New: gthr-default.h
Date: Mon, 07 Jun 2021 17:27:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100947

            Bug ID: 100947
           Summary: gthr-default.h
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kclifford at tranaptic dot ca
  Target Milestone: ---

I'm building gcc 11.1.0 with
host=3Di686-w64-mingw32
build=3Dx86_64-pc-cygwin
for arm-eabi.

When building g++, in gcc-11.1.0/libgcc/configure and
gcc-11.1.0/\libstdc++-v3/configure no default is provided for thread_header=
.=20
As a result the following line is logged:
  cp -pR /home/cross-gcc/11.1.0/gcc-11.1.0/libgcc/ gthr-default.h
and later the build fails.

In each of the configure files mentioned above I added:
  *) thread_header=3Dgthr-single.h ;;
to the "case $target_thread_file in" that sets thread_header.=