> On 28 Jan 2026, at 10:25, Jonathan Wakely <[email protected]> wrote:
>
> On Tue, 27 Jan 2026 at 00:33 +0000, Iain Sandoe wrote:
>> diff --git a/libstdc++-v3/src/experimental/Makefile.am
>> b/libstdc++-v3/src/experimental/Makefile.am
>> index e6d41cf66eb2..e428aef23c04 100644
>> --- a/libstdc++-v3/src/experimental/Makefile.am
>> +++ b/libstdc++-v3/src/experimental/Makefile.am
>> @@ -39,10 +39,16 @@ endif
>> headers =
>>
>> sources = \
>> - contract.cc
>> + contract26.cc
>>
>> # vpath % $(top_srcdir)/src/experimental
>>
>> +
>> +contract26.lo: contract26.cc
>> + $(LTCXXCOMPILE) -std=gnu++26 -fcontracts -c $<
>> +contract26.o: contract26.cc
>> + $(CXXCOMPILE) -std=gnu++26 -fcontracts -c $<
>> +
>> libstdc__exp_la_SOURCES = $(sources)
>>
>> libstdc__exp_la_LIBADD = \
>> diff --git a/libstdc++-v3/src/experimental/Makefile.in
>> b/libstdc++-v3/src/experimental/Makefile.in
>> index 8cb0acd4e68b..a9248197f8c7 100644
>> --- a/libstdc++-v3/src/experimental/Makefile.in
>> +++ b/libstdc++-v3/src/experimental/Makefile.in
>> @@ -152,7 +152,7 @@ am__installdirs = "$(DESTDIR)$(toolexeclibdir)"
>> LTLIBRARIES = $(toolexeclib_LTLIBRARIES)
>> @ENABLE_FILESYSTEM_TS_TRUE@am__DEPENDENCIES_1 =
>> $(top_builddir)/src/filesystem/libstdc++fsconvenience.la
>> @ENABLE_BACKTRACE_TRUE@am__DEPENDENCIES_2 =
>> $(top_builddir)/src/libbacktrace/libstdc++_libbacktrace.la
>> -am__objects_1 = contract.lo
>> +am__objects_1 = contract26.lo
>> am_libstdc__exp_la_OBJECTS = $(am__objects_1)
>> libstdc__exp_la_OBJECTS = $(am_libstdc__exp_la_OBJECTS)
>> AM_V_lt = $(am__v_lt_@AM_V@)
>> @@ -458,10 +458,8 @@ toolexeclib_LTLIBRARIES = libstdc++exp.la
>> @ENABLE_BACKTRACE_TRUE@backtrace_lib =
>> $(top_builddir)/src/libbacktrace/libstdc++_libbacktrace.la
>> headers =
>> sources = \
>> - contract.cc
>> + contract26.cc
>>
>> -
>> -# vpath % $(top_srcdir)/src/experimental
>> libstdc__exp_la_SOURCES = $(sources)
>> libstdc__exp_la_LIBADD = \
>> $(top_builddir)/src/c++23/libc++23convenience.la \
>> @@ -480,7 +478,7 @@ libstdc__exp_la_DEPENDENCIES = \
>> # OPTIMIZE_CXXFLAGS on the compile line so that -O2 can be overridden
>> # as the occasion calls for it.
>> AM_CXXFLAGS = \
>> - -std=gnu++17 -nostdinc++ \
>> + -std=gnu++20 -nostdinc++ \
>> $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
>> $(XTEMPLATE_FLAGS) $(VTV_CXXFLAGS) \
>> $(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS) \
>
> I'm not sure where this change came from, it looks like a remnant from
> some earlier change to src/experimental/Makefile.am which was
> reverted, but the Makefile.in wasn't regenerated.
yeah, so it seems - but I cannot for the life of me see what source change
caused the regeneration to misfire.
>
> I'll fix it now.
OK thanks - we were actually just looking at this - but will back off.
Iain
