[FFmpeg-devel] [PATCH 1/3] configure: use c++11 and fallback to c++0x for c++ files
cus at passwd.hu
Sun Mar 26 13:22:35 EEST 2017
On Sat, 25 Mar 2017, James Almer wrote:
> On 3/25/2017 8:51 PM, Marton Balint wrote:
>> Needed for the C+11 atomics. Also change add_cxxflags to check_cxxflags.
>> Signed-off-by: Marton Balint <cus at passwd.hu>
>> configure | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> diff --git a/configure b/configure
>> index c1aeb6e..6823894 100755
>> --- a/configure
>> +++ b/configure
>> @@ -4648,7 +4648,7 @@ fi
>> add_cppflags -D_ISOC99_SOURCE
>> add_cxxflags -D__STDC_CONSTANT_MACROS
>> -add_cxxflags -std=c++98
>> +check_cxxflags -std=c++11 || check_cxxflags -std=c++0x
> Do compilers that support setting --std=c++0x (Old provisional name for C++11)
> have actual support for std::atomic? They have by definition experimental and
> incomplete support for the standard in question.
Yes, gcc supports it since 4.4.
Also MSVC 2012 (which AFAIK does not even support -std) has support for it:
Clang since 3.1:
> Maybe an actual check for it would be needed if --std=c++11 isn't available.
Well, only decklink_enc needs this, so if we really want to check this,
and fail, if not, then it should be done somewhere after checking for
decklink stuff. I don't particularly think that is very useful, but can do
it if you think so.
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