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more details for how to bring the desired compiler to your shell

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buchel_k committed 2026-05-21 14:16:08 +02:00
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docs/admin-guide/configuration/software/gcc_compilers.md
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@@ -13,7 +13,7 @@ https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/develop
To see which versions of the gcc-toolset are available on your system, you can use the following command:
```bash
[root@test ~]# dnf search gcc-toolset | egrep 'gcc-toolset-[0-9]{2}.x86_64'
[root@test ~]# dnf search gcc-toolset | egrep 'gcc-toolset-[0-9]+.x86_64'
Last metadata expiration check: 1 day, 7:28:21 ago on Wed 20 May 2026 06:28:36 AM CEST.
gcc-toolset-12.x86_64 : Package that installs gcc-toolset-12
gcc-toolset-13.x86_64 : Package that installs gcc-toolset-13
@@ -30,26 +30,21 @@ gcc-toolset-12
After installing the desired gcc-toolset package, you can use the `scl enable` command to switch to the desired version of GCC for a single command or for the current shell session.
To use a specific version of GCC for a single command, you can use the following syntax:
To use a specific version of GCC for a single command, you can use the following syntax (the `$COMMAND` needs to be one single argument string):
```bash
[root@test ~]# scl enable gcc-toolset-12 $COMMAND
[root@test ~]# scl enable gcc-toolset-12 "$COMMAND"
```
or to spawn a new shell with the compiler ready:
```bash
[root@test ~]# scl enable gcc-toolset-N bash
[root@test ~]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/rh/gcc-toolset-12/root/usr/libexec/gcc/x86_64-redhat-linux/12/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/gcc-toolset-12/root/usr --mandir=/opt/rh/gcc-toolset-12/root/usr/share/man --infodir=/opt/rh/gcc-toolset-12/root/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-12.2.1-20221121/obj-x86_64-redhat-linux/isl-install --enable-offload-targets=nvptx-none --without-cuda-driver --enable-offload-defaulted --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.1 20221121 (Red Hat 12.2.1-7) (GCC)
[root@test ~]# scl enable gcc-toolset-12 bash
```
To load it into the current shell do (e.g. to be used in `~/.bashrc`):
```bash
source scl_source enable gcc-toolset-12
```
!!! note
In most cases we recommend to use the gcc version shipped with the RHEL version. Beside that we recommend to use the latest version of the gcc-toolset available for your RHEL version, as it will include the latest bug fixes and security patches.
In most cases we recommend to use the gcc version shipped with the RHEL version.