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# What is gcc-config?
`gcc-config` allows Gentoo users to switch active gcc safely and allows
querying facts about installed toolchains.
## Usage
To switch active `gcc` while system runs:
```
$ gcc-config x86_64-pc-linux-gnu-8.1.0
$ gcc-config x86_64-pc-linux-gnu-7.2.0
```
Ideally changes should be visible instantly and atomically without shell restart.
To query where the real `gcc` binaries are hiding:
```
$ gcc-config -B $(gcc-config -c)
```
To parse a profile into TARGET and toolchain version:
```
$ gcc-config -S sparc64-unknown-linux-gnu-9.2.0
```
## Files, variables, things.
- Wrappers (symlinks to compiler binary like `/usr/${CTARGET}/gcc-bin/${GCC_VERSION}/gcc`)
`/usr/bin/gcc` (native)
`/usr/bin/g++` (native)
`/usr/bin/${CTARGET}-gcc` (native and cross)
...
(all files from `/usr/${CTARGET}/gcc-bin/$GCC_VERSION/*`)
See `gcc-config` script for wrapping details.
`/usr/bin/c89` (native)
`/usr/bin/c99` (native)
- private `gcc` configs (provided by `toolchain.eclass`, gcc ebuilds)
`/etc/env.d/gcc/x86_64-pc-linux-gnu-8.1.0`
Contains variables that describe toolchain layout:
```
LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0"
MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/man"
INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/info"
STDCXX_INCDIR="g++-v8"
CTARGET="x86_64-pc-linux-gnu"
GCC_SPECS=""
MULTIOSDIRS="../lib64"
GCC_PATH="/usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0"
```
Used by `gcc-config` to generate wrappers and `05gcc-` `env.d` files.
- `gcc` `env.d` compiler entries (provided by `gcc-config`)
`/etc/env.d/04gcc-${CTARGET}` (native)
Populates paths for native-compilers
```
GCC_SPECS=""
MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/man"
INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/info"
```
Used by `env-update` to populate `$PATH` and more (TODO: remove `$PATH` population).
## TODOs
- Write proper `gcc-config` manpage based on this readme to be more discoverable.
- Figure out symlink ownership story. Right now, symlinks don't belong to any package.
See [bug 626606](https://bugs.gentoo.org/626606).
## Releasing
```
$ release=2.3.1; git tag -a -s -m "release ${release}" v${release}; make dist PV=${release}
$ git push --tags origin
```
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