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| author | Jonathan Wakely <jwakely@redhat.com> | 2020-12-09 16:53:18 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2020-12-09 16:56:54 +0000 |
| commit | 0aa1786d34b891c8e1e219fb11255af5358013c4 (patch) | |
| tree | ffcd99b767bd68d2d519d0e697977203496133f0 /libstdc++-v3/config.h.in | |
| parent | 84d08255f9f2f7137caf648fcc9dc36101bc893c (diff) | |
| download | gcc-0aa1786d34b891c8e1e219fb11255af5358013c4.zip gcc-0aa1786d34b891c8e1e219fb11255af5358013c4.tar.gz gcc-0aa1786d34b891c8e1e219fb11255af5358013c4.tar.bz2 | |
libstdc++: Fix build failure for target with no way to sleep
In previous releases the std::this_thread::sleep_for function was only
declared if the target supports multiple threads. I changed that
recently in r11-2649-g5bbb1f3000c57fd4d95969b30fa0e35be6d54ffb so that
sleep_for could be used single-threaded. But that means that targets
using --disable-threads are now required to provide some way to sleep.
This breaks the build for (at least) AVR when trying to build a hosted
library.
This patch adds a new autoconf macro that is defined when no way to
sleep is available, and uses that to suppress the sleeping functions in
std::this_thread.
The #error in src/c++11/thread.cc is retained for the case where there
is no sleep function available but multiple threads are supported. This
is consistent with previous releases, but that #error could probably be
removed without any consequences.
libstdc++-v3/ChangeLog:
* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Define NO_SLEEP
if none of nanosleep, sleep and Sleep is available.
* config.h.in: Regenerate.
* configure: Regenerate.
* include/std/thread [_GLIBCXX_NO_SLEEP] (__sleep_for): Do
not declare.
[_GLIBCXX_NO_SLEEP] (sleep_for, sleep_until): Do not
define.
* src/c++11/thread.cc [_GLIBCXX_NO_SLEEP] (__sleep_for): Do
not define.
Diffstat (limited to 'libstdc++-v3/config.h.in')
| -rw-r--r-- | libstdc++-v3/config.h.in | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in index 72faabf..17b1199 100644 --- a/libstdc++-v3/config.h.in +++ b/libstdc++-v3/config.h.in @@ -767,6 +767,9 @@ */ #undef LT_OBJDIR +/* Defined if no way to sleep is available. */ +#undef NO_SLEEP + /* Name of package */ #undef PACKAGE |