[libc][Github] Remove ccache variant logic (llvm#152042)

hendrikmuhs/ccache-action#279 has now been
resolved, so we can use sccache for the arm tests too and do not need to
differentiate between platforms.

Author: boomanaiden154

.github/workflows/libc-fullbuild-tests.yml

@@ -20,36 +20,30 @@ jobs:
         include:
           - os: ubuntu-24.04
             build_type: Debug
-            ccache-variant: sccache
             c_compiler: clang-22
             cpp_compiler: clang++-22
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: Release
-            ccache-variant: sccache
             c_compiler: clang-22
             cpp_compiler: clang++-22
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: MinSizeRel
-            ccache-variant: sccache
             c_compiler: clang-22
             cpp_compiler: clang++-22
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
-          # TODO: remove ccache logic when https://github.com/hendrikmuhs/ccache-action/issues/279 is resolved.
           - os: ubuntu-24.04-arm
             build_type: Debug
-            ccache-variant: ccache
             c_compiler: clang-22
             cpp_compiler: clang++-22
             target: aarch64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: Debug
-            ccache-variant: ccache
             c_compiler: clang-22
             cpp_compiler: clang++-22
             target: x86_64-unknown-uefi-llvm
@@ -71,7 +65,7 @@ jobs:
       with:
         max-size: 1G
         key: libc_fullbuild_${{ matrix.c_compiler }}
-        variant: ${{ matrix.ccache-variant }}
+        variant: sccache
 
     # Notice:
     # - MPFR is required by some of the mathlib tests.
@@ -112,8 +106,8 @@ jobs:
         -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }} \
         -DCMAKE_C_COMPILER=${{ matrix.c_compiler }} \
         -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \
-        -DCMAKE_C_COMPILER_LAUNCHER=${{ matrix.ccache-variant }} \
-        -DCMAKE_CXX_COMPILER_LAUNCHER=${{ matrix.ccache-variant }} \
+        -DCMAKE_C_COMPILER_LAUNCHER=sccache \
+        -DCMAKE_CXX_COMPILER_LAUNCHER=sccache \
         -DCMAKE_INSTALL_PREFIX=${{ steps.strings.outputs.build-install-dir }} \
         -DLLVM_RUNTIME_TARGETS=${{ matrix.target }} \
         -DLLVM_ENABLE_RUNTIMES="$RUNTIMES" \

.github/workflows/libc-overlay-tests.yml

@@ -20,28 +20,22 @@ jobs:
         include:
           # TODO: add linux gcc when it is fixed
           - os: ubuntu-24.04
-            ccache-variant: sccache
             compiler:
               c_compiler: clang
               cpp_compiler: clang++
-          # TODO: remove ccache logic when https://github.com/hendrikmuhs/ccache-action/issues/279 is resolved.
           - os: ubuntu-24.04-arm
-            ccache-variant: ccache
             compiler:
               c_compiler: clang
               cpp_compiler: clang++
           - os: windows-2022
-            ccache-variant: sccache
             compiler:
               c_compiler: clang-cl
               cpp_compiler: clang-cl
           - os: windows-2025
-            ccache-variant: sccache
             compiler:
               c_compiler: clang-cl
               cpp_compiler: clang-cl
           - os: macos-14
-            ccache-variant: sccache
             compiler:
               c_compiler: clang
               cpp_compiler: clang++
@@ -61,7 +55,7 @@ jobs:
       with:
         max-size: 1G
         key: libc_overlay_build_${{ matrix.os }}_${{ matrix.compiler.c_compiler }}
-        variant: ${{ matrix.ccache-variant }}
+        variant: sccache
 
     # MPFR is required by some of the mathlib tests.
     - name: Prepare dependencies (Ubuntu)
@@ -97,8 +91,8 @@ jobs:
         -DCMAKE_CXX_COMPILER=${{ matrix.compiler.cpp_compiler }}
         -DCMAKE_C_COMPILER=${{ matrix.compiler.c_compiler }}
         -DCMAKE_BUILD_TYPE=Debug
-        -DCMAKE_C_COMPILER_LAUNCHER=${{ matrix.ccache-variant }}
-        -DCMAKE_CXX_COMPILER_LAUNCHER=${{ matrix.ccache-variant }}
+        -DCMAKE_C_COMPILER_LAUNCHER=sccache
+        -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
         -DCMAKE_POLICY_DEFAULT_CMP0141=NEW
         -DCMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded
         -DLLVM_ENABLE_RUNTIMES=libc