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For -std=c17 (and higher) DW_AT_language is C11:

$ echo "int x;" | gcc -c -xc - -fPIC -o x.o -g -std=c17
$ gcc -shared -o x.so x.o
$ readelf x.so -w | grep -P '(DW_AT_language\s*:|DWARF Version:)'
    <11>   DW_AT_language    : 29       (C11)
  DWARF Version:               5

$ gcc --version
gcc-14.2.0 (GCC) 14.2.0

$ readelf --version
GNU readelf (GNU Binutils for Ubuntu) 2.38

The C11 is produced when using -std=c18 and -std=c2x.

Why DW_AT_language is C11 for -std=c17 (and higher)?

Is it because Language Codes Added Since Version 5 (e.g. DW_LANG_C17) perhaps have not yet been implemented by GCC and/or by readelf?

Note: this question is asked out of curiosity. There is no real issue associated with this question.

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