cmake: allow user to select compiler cache

CMakeLists.txt

@@ -58,8 +58,11 @@ endif()
 
 project(monero)
 
-option (USE_COMPILER_CACHE "Use compiler cache if a usable instance is found (sccache/ccache)" ON)
-if (USE_COMPILER_CACHE)
+set (COMPILER_CACHE "auto" CACHE STRING "Compiler cache to use: auto, ccache, sccache, or none")
+set_property(CACHE COMPILER_CACHE PROPERTY STRINGS auto ccache sccache none)
+if (COMPILER_CACHE STREQUAL "none")
+    message(STATUS "Compiler cache deselected")
+elseif (COMPILER_CACHE STREQUAL "auto")
     find_program(SCCACHE sccache)
     find_program(CCACHE ccache)
     if (SCCACHE)
@@ -75,8 +78,18 @@ if (USE_COMPILER_CACHE)
     else()
         message(STATUS "No compiler cache found")
     endif()
+elseif (COMPILER_CACHE STREQUAL "sccache")
+    find_program(SCCACHE sccache REQUIRED)
+    message(STATUS "Using sccache: ${SCCACHE}")
+    set(CMAKE_C_COMPILER_LAUNCHER   "${SCCACHE}")
+    set(CMAKE_CXX_COMPILER_LAUNCHER "${SCCACHE}")
+elseif (COMPILER_CACHE STREQUAL "ccache")
+    find_program(CCACHE ccache REQUIRED)
+    message(STATUS "Using ccache: ${CCACHE}")
+    set(CMAKE_C_COMPILER_LAUNCHER   "${CCACHE}")
+    set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE}")
 else()
-    message(STATUS "Compiler cache deselected")
+    message(FATAL_ERROR "Invalid COMPILER_CACHE value '${COMPILER_CACHE}': expected auto, ccache, sccache, or none")
 endif()
 
 option (USE_COMPILATION_TIME_PROFILER "Use compilation time profiler (for CLang >= 9 only)" OFF)

contrib/guix/libexec/build.sh

@@ -336,7 +336,7 @@ mkdir -p "$DISTSRC"
     esac
 
     # Turn off unused default options
-    CMAKEFLAGS+=" -DUSE_COMPILER_CACHE=OFF -DBUILD_DOCUMENTATION=OFF"
+    CMAKEFLAGS+=" -DCOMPILER_CACHE=none -DBUILD_DOCUMENTATION=OFF"
 
     # Configure this DISTSRC for $HOST
     # shellcheck disable=SC2086

utils/health/clang-build-time-analyzer-run.sh

@@ -56,7 +56,7 @@ mkdir -p "$DIR_BUILD" && cd "$DIR_BUILD"
 cmake ../.. \
 -DCMAKE_C_COMPILER=clang \
 -DCMAKE_CXX_COMPILER=clang++ \
--DUSE_COMPILER_CACHE=OFF \
+-DCOMPILER_CACHE=none \
 -DUSE_COMPILATION_TIME_PROFILER=ON \
 -DBUILD_SHARED_LIBS=ON \
 -DBUILD_TESTS=ON

utils/health/clang-include-what-you-use-run.sh

@@ -56,7 +56,7 @@ UWYU_COMMAND="$PROG;-Xiwyu;any;-Xiwyu;iwyu;-Xiwyu;args" # Copy-pasted from the u
 cmake ../.. \
 -DCMAKE_C_COMPILER=clang \
 -DCMAKE_CXX_COMPILER=clang++ \
--DUSE_COMPILER_CACHE=ON \
+-DCOMPILER_CACHE=auto \
 -DCMAKE_C_INCLUDE_WHAT_YOU_USE="$UWYU_COMMAND" \
 -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE="$UWYU_COMMAND" \
 -DBUILD_SHARED_LIBS=ON \

utils/health/clang-tidy-run-common.sh

@@ -45,7 +45,7 @@ function tidy_for_language() {
 	cmake ../.. \
 	-DCMAKE_C_COMPILER=clang \
 	-DCMAKE_CXX_COMPILER=clang++ \
-	-DUSE_COMPILER_CACHE=ON \
+	-DCOMPILER_CACHE=auto \
 	-DUSE_CLANG_TIDY_${LANG}=ON \
 	-DBUILD_SHARED_LIBS=ON \
 	-DBUILD_TESTS=ON