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| author | Jonathan Wakely <jwakely@redhat.com> | 2024-01-15 14:09:21 +0000 |
|---|---|---|
| committer | Jonathan Wakely <redi@gcc.gnu.org> | 2024-09-15 16:15:28 +0100 |
| commit | 1dde83f0ec313166fc91e6784a0ca2e3db46acee (patch) | |
| tree | 3d6913fad6e908c5448177965f6ce927f13f961c /libstdc++-v3/doc | |
| parent | f91fe35aa14bf4d44f2c8394301858b42e12ee45 (diff) | |
| download | gcc-1dde83f0ec313166fc91e6784a0ca2e3db46acee.zip gcc-1dde83f0ec313166fc91e6784a0ca2e3db46acee.tar.gz gcc-1dde83f0ec313166fc91e6784a0ca2e3db46acee.tar.bz2 | |
libstdc++: Enable most of <chrono> for freestanding
This makes durations, time points and calendrical types available for
freestanding. The clocks and time zone utilities are disabled for
freestanding, as they require functions in the hosted lib.
Add support for a new macro _GLIBCXX_NO_FREESTANDING_CHRONO which can be
used to explicitly disable <chrono> for freestanding.
libstdc++-v3/ChangeLog:
* doc/xml/manual/using.xml (_GLIBCXX_NO_FREESTANDING_CHRONO):
Document macro.
* doc/html/*: Regenerate.
* include/bits/chrono.h [_GLIBCXX_NO_FREESTANDING_CHRONO]:
Only include <bits/require_hosted.h> when this macro is defined.
[_GLIBCXX_HOSTED]: Only define clocks for hosted.
* include/bits/version.def (chrono_udls): Remove hosted=yes.
* include/bits/version.h: Regenerate.
* include/std/chrono [_GLIBCXX_HOSTED]: Only define clocks and
time zone utilities for hosted.
* testsuite/std/time/freestanding.cc: New test.
Diffstat (limited to 'libstdc++-v3/doc')
| -rw-r--r-- | libstdc++-v3/doc/html/manual/using_macros.html | 7 | ||||
| -rw-r--r-- | libstdc++-v3/doc/xml/manual/using.xml | 12 |
2 files changed, 19 insertions, 0 deletions
diff --git a/libstdc++-v3/doc/html/manual/using_macros.html b/libstdc++-v3/doc/html/manual/using_macros.html index ae56469..67623b5 100644 --- a/libstdc++-v3/doc/html/manual/using_macros.html +++ b/libstdc++-v3/doc/html/manual/using_macros.html @@ -124,4 +124,11 @@ must be present on all vector operations or none, so this macro must be defined to the same value for all translation units that create, destroy, or modify vectors. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_NO_FREESTANDING_CHRONO</code></span></dt><dd><p> + Undefined by default. When defined, the + <code class="filename"><chrono></code> header cannot + be used with <code class="option">-ffreestanding</code>. + When not defined, durations, time points, and calendar types are + available for freestanding, but the standard clocks and the time zone + database are not (because they require OS support). </p></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using_dual_abi.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Headers </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Dual ABI</td></tr></table></div></body></html>
\ No newline at end of file diff --git a/libstdc++-v3/doc/xml/manual/using.xml b/libstdc++-v3/doc/xml/manual/using.xml index 6675359..4e1c700 100644 --- a/libstdc++-v3/doc/xml/manual/using.xml +++ b/libstdc++-v3/doc/xml/manual/using.xml @@ -1321,6 +1321,18 @@ g++ -Winvalid-pch -I. -include stdc++.h -H -g -O2 hello.cc -o test.exe destroy, or modify vectors. </para> </listitem></varlistentry> + + <varlistentry><term><code>_GLIBCXX_NO_FREESTANDING_CHRONO</code></term> + <listitem> + <para> + Undefined by default. When defined, the + <filename class="headerfile"><chrono></filename> header cannot + be used with <option>-ffreestanding</option>. + When not defined, durations, time points, and calendar types are + available for freestanding, but the standard clocks and the time zone + database are not (because they require OS support). + </para> + </listitem></varlistentry> </variablelist> </section> |