Open varungandhi-src opened 12 months ago
The functional
header is located under /nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0/functional
.
Added the following the the "arguments"
array:
"-isystem",
"/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0",
New error:
In file included from src/libcmd/legacy.cc:1:
In file included from src/libcmd/legacy.hh:4:
/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0/functional:48:10: fatal error: 'bits/c++config.h' file not found
#include <bits/c++config.h>
^~~~~~~~~~~~~~~~~~
1 error generated.
Added the following to the "arguments"
array:
"-isystem",
"/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0/x86_64-unknown-linux-gnu",
New error:
In file included from src/libcmd/legacy.cc:1:
In file included from src/libcmd/legacy.hh:4:
In file included from /nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0/functional:48:
In file included from /nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0/x86_64-unknown-linux-gnu/bits/c++config.h:586:
/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/include/c++/11.3.0/x86_64-unknown-linux-gnu/bits/os_defines.h:39:10: fatal error: 'features.h' file not found
#include <features.h>
^~~~~~~~~~~~
1 error generated.
The features.h
header is found under /nix/store/4pqv2mwdn88h7xvsm7a5zplrd8sxzvw0-glibc-2.35-163-dev/include/features.h
, so add the following to "arguments"
after the previous -isystem
flags (the after part is important because cstdlib
from C++ has #include_next <stdlib.h>
):
"-isystem",
"/nix/store/4pqv2mwdn88h7xvsm7a5zplrd8sxzvw0-glibc-2.35-163-dev/include",
This removes all compilation errors.
After that, the index's snapshot output contains:
typedef std::function<void(int, char * *)> MainFunction;
// ^^^ reference cxx $ std/
// ^^^^^^^^ reference cxx $ std/function#
// ^^^^^^^^^^^^ definition cxx $ nix/MainFunction#
// documentation No documentation available.
struct RegisterLegacyCommand
// ^^^^^^^^^^^^^^^^^^^^^ definition cxx $ nix/RegisterLegacyCommand#
// documentation No documentation available.
{
typedef std::map<std::string, MainFunction> Commands;
// ^^^ reference cxx $ std/
// ^^^ reference cxx $ std/map#
// ^^^ reference cxx $ std/
// ^^^^^^ reference cxx $ std/string#
// ^^^^^^^^^^^^ reference cxx $ nix/MainFunction#
// ^^^^^^^^ definition cxx $ nix/RegisterLegacyCommand#Commands#
// documentation No documentation available.
We need to figure out how to programatically determine these flags in the general case.
Full output for gcc -print-search-dirs
install: /nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/
programs: =/nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/:/nix/store/mdck89nsfisflwjv6xv8ydj7dj0sj2pn-gcc-11.3.0-lib/lib/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/mdck89nsfisflwjv6xv8ydj7dj0sj2pn-gcc-11.3.0-lib/lib/:/nix/store/dq0xwmsk1g0i2ayg6pb7y87na2knzylh-gcc-wrapper-11.3.0/bin/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/dq0xwmsk1g0i2ayg6pb7y87na2knzylh-gcc-wrapper-11.3.0/bin/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/libexec/gcc/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/libexec/gcc/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/libexec/gcc/x86_64-unknown-linux-gnu/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../x86_64-unknown-linux-gnu/bin/
libraries: =/nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/4nlgxhb09sdr51nc9hdm8az5b08vzkgx-glibc-2.35-163/lib/:/nix/store/mdck89nsfisflwjv6xv8ydj7dj0sj2pn-gcc-11.3.0-lib/lib/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/mdck89nsfisflwjv6xv8ydj7dj0sj2pn-gcc-11.3.0-lib/lib/:/nix/store/dq0xwmsk1g0i2ayg6pb7y87na2knzylh-gcc-wrapper-11.3.0/bin/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/dq0xwmsk1g0i2ayg6pb7y87na2knzylh-gcc-wrapper-11.3.0/bin/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../x86_64-unknown-linux-gnu/lib/x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../x86_64-unknown-linux-gnu/lib/../lib64/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../x86_64-unknown-linux-gnu/11.3.0/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../lib64/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../x86_64-unknown-linux-gnu/lib/:/nix/store/1gf2flfqnpqbr1b4p4qz2f72y42bs56r-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../
One hacky way to do this programmatically, is that if the compiler is gcc
/g++
, then take the following file:
// scip-clang-magic-00 -- Locate glibc headers
#include <features.h>
// scip-clang-magic-01 -- Locate platform-specific stdlib headers
#include <bits/c++config.h>
// scip-clang-magic-02 -- Locate platform-independent stdlib headers
#include <cstdlib>
And run it through g++ -C -E tmp.cc
, and parse the lines following the magic comments. (-C
preserves comments)
This avoids having to detect any platform triples or any extra path calculation, as we get the paths from g++
itself.
I can't think of a better way at the moment.
The problem reproduces on macOS with Clang too. I had to use Bear 3.1.2 installed separately, the Bear 3.0.20 which was part of the Nix environment didn't work.
For Clang + macOS, the following is enough:
// scip-clang-magic-00 -- Locate libSystem headers
#include <aio.h>
// scip-clang-magic-02 -- Locate platform-independent stdlib headers
#include <cstdlib>
features.h
is glibc-specific, so perhaps we should avoid that. aio.h
is a POSIX header so it works equally well on Linux with glibc.
bits/c++config.h
is not used by Clang on macOS (at least, in some situations), so we can skip that.
Reproduction steps (on Linux):
The above error shouldn't come up.