website: Add doc explaining GCC-9 not supported (#94)

gem5 · Nov 13, 2023 · 085939a · 085939a
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diff --git a/_pages/documentation/general_docs/building/index.md b/_pages/documentation/general_docs/building/index.md
@@ -38,7 +38,9 @@ information on this.
 
 * **git** : gem5 uses git for version control.
 * **gcc**: gcc is used to compiled gem5. **Version >=7 must be used**. We
-support up to gcc Version 12.
+support up to gcc Version 12. **Note**: GCC Version 9 may be used but is not officially
+supported due to it
+[increasing gem5 Object File sizes](https://github.com/gem5/gem5/issues/555).
 * **Clang**: Clang can also be used. At present, we support Clang 6 to
 Clang 14 (inclusive).
 * **SCons** : gem5 uses SCons as its build environment. SCons 3.0 or greater

diff --git a/_pages/documentation/learning_gem5/part1/part1_1_building.md b/_pages/documentation/learning_gem5/part1/part1_1_building.md
@@ -49,6 +49,10 @@ sudo apt install build-essential git m4 scons zlib1g zlib1g-dev libprotobuf-dev
 
        **We support GCC Versions >=7, up to GCC 11**
 
+       **Note**: We do not recommend using GCC Version 9 due to a [known issue
+       with it increasing gem5 Object File size](https://github.com/gem5/gem5/issues/555).
+       It is not officially supported.
+
 3.  [SCons 3.0+](http://www.scons.org/)
     :   gem5 uses SCons as its build environment. SCons is like make on
         steroids and uses Python scripts for all aspects of the build