[llvm-bugs] [Bug 37298] New: support for GCC complex data types extension is always enabled.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37298

            Bug ID: 37298
           Summary: support for GCC complex data types extension is always
                    enabled.
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: konstantin.belochapka at sony.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 20251
  --> https://bugs.llvm.org/attachment.cgi?id=20251&action=edit
reprodicible

clang with -std=c++11 option does not disable support for GCC complex data
types extensions.

-------------------------------------------------------------------------------
Compile the attached source with -std=c++14:

$clang -c -std=c++11 gcc-complex-data-extension.cpp

This produces no warnings or errors.

--------------------------------------------------------------------------------
GCC with -std=c++14 option produces the following error messages:

$gcc -c -std=c++14 gcc-complex-data-extension.cpp

gcc-complex-data-extension.cpp: In function 'int test()':
gcc-complex-data-extension.cpp:25:20: error: unable to find numeric literal
operator 'operator""i'
  cshort_t cs = 2 + 2i;
                    ^
.....

gcc-complex-data-extension.cpp:31:24: note: use -std=gnu++11 or
-fext-numeric-literals to enable
more built-in suffixes
gcc-complex-data-extension.cpp:32:26: error: unable to find numeric literal
operator 'operator""fi'
  cldouble_t cld = 8.0f + 2.1fi;
                          ^
gcc-complex-data-extension.cpp:32:26: note: use -std=gnu++11 or
-fext-numeric-literals to enable
more built-in suffixes

--------------------------------------------------------------------------------
After adding -pedantic, we can observe the following list of warnings:

$clang -c -std=c++11 -pedantic gcc-complex-data-extension.cpp

Produces the following:
gcc-complex-data-extension.cpp:25:20: warning: imaginary constants are a GNU
extension
[-Wgnu-imaginary-constant]
        cshort_t cs = 2 + 2i;
                          ^
......                              ^
gcc-complex-data-extension.cpp:32:26: warning: imaginary constants are a GNU
extension
[-Wgnu-imaginary-constant]
        cldouble_t cld = 8.0f + 2.1fi; 


$clang -c -std=gnu++11 -pedantic gcc-complex-data-extension.cpp

Produces identical list of warnings.


Conclusion:
Unlike GCC, clang when used with -std=c++11 option, does not disable GCC
complex data types extension support.

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