[Octave-bug-tracker] [bug #65327] octave 10 stores sets CXX wrong

[Dmitri A. Sergatskov]

Follow-up Comment #4, bug#65327 (group octave):


> First, if multiple "-std=..." options are present, what does GCC > do?  What
would clang++ or any other compiler do?

I think the last one (on the right) overwrites the previous ones.
So for some reason "g++ -std=gnu++20" fails the C++11 test:

configure:11200: checking for g++ -std=gnu++20 option to enable C++11
features
configure:11436: g++ -std=gnu++20  -c -Wall -ggdb3 -O2 -march=native
-mtune=native -mavx -mavx2 -flto=auto  conftest.cpp >&5
conftest.cpp: In function 'int main()':
conftest.cpp:173:8: warning: unused variable 'a1' [-Wunused-variable]
  173 |   auto a1 = 6538;
      |        ^~
conftest.cpp:175:8: warning: unused variable 'a3' [-Wunused-variable]
  175 |   auto a3 = "String literal";
      |        ^~
conftest.cpp:177:16: warning: unused variable 'a4' [-Wunused-variable]
  177 |   decltype(a2) a4 = 34895.034;
      |                ^~
conftest.cpp:181:9: warning: unused variable 'sa' [-Wunused-variable]
  181 |   short sa[cxx11test::get_val()] = { 0 };
      |         ^~
conftest.cpp:185:23: warning: unused variable 'il' [-Wunused-variable]
  185 |   cxx11test::testinit il = { 4323, 435234.23544 };
      |                       ^~
conftest.cpp:211:8: warning: unused variable 'match' [-Wunused-variable]
  211 |   bool match = std::regex_search(testmatch, filename_regex);
      |        ^~~~~
conftest.cpp:215:35: warning: unused variable 'size' [-Wunused-variable]
  215 |   cxx11test::int_array::size_type size = array.size();
      |                                   ^~~~
conftest.cpp:220:25: warning: empty parentheses were disambiguated as a
function declaration [-Wvexing-parse]
  220 |   cxx11test::delegate d2();
      |                         ^~
conftest.cpp:220:25: note: remove parentheses to default-initialize a
variable
  220 |   cxx11test::delegate d2();
      |                         ^~
      |                         --
conftest.cpp:220:25: note: or replace parentheses with braces to
value-initialize a variable
conftest.cpp:229:9: warning: unused variable 'c' [-Wunused-variable]
  229 |   char *c = nullptr;
      |         ^
conftest.cpp:237:22: error: invalid conversion from 'const char8_t*' to 'const
char*' [-fpermissive]
  237 |   char const *utf8 = u8"UTF-8 string \u2500";
      |                      ^~~~~~~~~~~~~~~~~~~~~~~
      |                      |
      |                      const char8_t*
conftest.cpp:237:15: warning: unused variable 'utf8' [-Wunused-variable]
  237 |   char const *utf8 = u8"UTF-8 string \u2500";
      |               ^~~~
conftest.cpp:238:19: warning: unused variable 'utf16' [-Wunused-variable]
  238 |   char16_t const *utf16 = u"UTF-8 string \u2500";
      |                   ^~~~~
conftest.cpp:239:19: warning: unused variable 'utf32' [-Wunused-variable]
  239 |   char32_t const *utf32 = U"UTF-32 string \u2500";
      |                   ^~~~~
configure:11436: $? = 1
configure: failed program was:


So it adds "-std=c++11" which later would require "-std=c++17" 
because of the pmr. 

Dmitri.
-- 



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