[Bug c/71721] New: uclinux posix threads

["wbx at openadk dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71721

            Bug ID: 71721
           Summary: uclinux posix threads
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wbx at openadk dot org
  Target Milestone: ---

Hi,

it would be nice if uclinux targets are allowed to enable posix threads.
Together with uClibc-ng/uClibc you can build m68k-nommu toolchain and enable
old Linuxthreads instead of NPTL/TLS. With following change it is possible to
build
boost, which checks if gcc is build with threads enabled.

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 1f75f17..92df4b9 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -827,6 +827,9 @@ case ${target} in
 *-*-uclinux*)
   extra_options="$extra_options gnu-user.opt"
   use_gcc_stdint=wrap
+  case ${enable_threads} in
+    "" | yes | posix) thread_file='posix' ;;
+  esac
   tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC SINGLE_LIBC"
   ;;
 *-*-rdos*)

Tested with a simple boost application on qemu-system-m68k emulating a coldfire
board without MMU. Other noMMU targets as cortex-m3/cortex-m4 will benefit from
this change, too.