charconv header not found gcc 12

Asked Jun 16 '22 at 02:34

Active Jun 16 '22 at 02:34

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I'm running Debian 9 on WSL 2 and I'm trying to compile C++ code that uses the <charconv> header. I have the line set(CMAKE_CXX_STANDARD 17) in my Cmake file so it's definitely using C++ 17 but when I compile it I get this error message

In file included from /mnt/d/blang/frontend/Token.cc:5:0:
/mnt/d/blang/frontend/Token.h:11:20: fatal error: charconv: No such file or directory
 #include <charconv>

I build GCC 12 from source and installed it. When I run gcc -v I get this.

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/12.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.1.0 (GCC)

How do I fix this?

asked Jun 16 '22 at 02:34

ishaangupte

you can check the actual command in json compilation database (`compile_commands.json`). Get it by setting `cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=on ..` – Laney Jun 16 '22 at 03:02
Too many unknowns. Try to compile a small c++ program without cmake. – n. m. could be an AI Jun 16 '22 at 05:05
See also https://stackoverflow.com/questions/45688522/how-to-enable-c17-in-cmake – n. m. could be an AI Jun 16 '22 at 05:30

charconv header not found gcc 12

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