Add support for mold, add optimization flags for linking step

4 files changed, 31 insertions, 9 deletions

diff --git a/src/CmakeModule.cpp b/src/CmakeModule.cpp
index e3b3918..063cced 100644
--- a/src/CmakeModule.cpp
+++ b/src/CmakeModule.cpp
@@ -239,7 +239,9 @@ namespace sibs
             }
         }
 
-        if(!config.linker.empty())
+        if(config.linker == "mold")
+            cflags += TINYDIR_STRING(" -B/usr/lib/mold/");
+        else if(!config.linker.empty())
             cflags += TINYDIR_STRING(" -fuse-ld=") + toFileString(config.linker);
 
         cxxflags = cflags;
diff --git a/src/FileUtil.cpp b/src/FileUtil.cpp
index e1142ec..02acfa4 100644
--- a/src/FileUtil.cpp
+++ b/src/FileUtil.cpp
@@ -141,6 +141,11 @@ namespace sibs
         else
             return FileType::FILE_NOT_FOUND;
     }
+
+    bool fileExists(const _tinydir_char_t *path) {
+        struct stat64 fileStat;
+        return stat64(path, &fileStat) == 0;
+    }
     
     Result<u64> getFileLastModifiedTime(const _tinydir_char_t *path)
     {
@@ -163,6 +168,11 @@ namespace sibs
         else
             return FileType::FILE_NOT_FOUND;
     }
+
+    bool fileExists(const _tinydir_char_t *path) {
+        struct _stat64i32 fileStat;
+        return _wstat(path, &fileStat) == 0;
+    }
     
     Result<u64> getFileLastModifiedTime(const _tinydir_char_t *path)
     {
diff --git a/src/Linker.cpp b/src/Linker.cpp
index 1546909..d03e3a4 100644
--- a/src/Linker.cpp
+++ b/src/Linker.cpp
@@ -46,4 +46,8 @@ namespace sibs
     bool is_lld_linker_installed() {
         return is_linker_installed("ld.lld");
     }
+
+    bool is_mold_linker_installed() {
+        return is_linker_installed("ld.mold") && fileExists("/usr/lib/mold/ld");
+    }
 }
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index c67ac68..aa06549 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -129,7 +129,7 @@ static void usage()
 
 static void usageBuild(bool run)
 {
-    printf("Usage: sibs %s [project_path] [--debug|--release] [--sanitize=(address|undefined|leak|thread|none)] [--linker=linker] [--platform <platform>]\n\n", run ? "run" : "build");
+    printf("Usage: sibs %s [project_path] [--debug|--release] [--sanitize=(address|undefined|leak|thread|none)] [--linker=lld|gold|mold] [--platform <platform>]\n\n", run ? "run" : "build");
     printf("%s a sibs project\n\n", run ? "Build and run" : "Build");
     printf("Options:\n");
     printf("  project_path         The directory containing a project.conf file - Optional (default: current directory)\n");
@@ -138,7 +138,7 @@ static void usageBuild(bool run)
     printf("  --platform           The platform to build for - Optional (default: the running platform)\n");
     printf("  --lto                Use link-time optimization. May increase compile times - Optional (default: not used)\n");
     printf("  --debug-symbols      Include debug symbols in release mode - Optional (default: not used)\n");
-    printf("  --linker=linker      The linker to use. \"lld\" or \"gold\" is the default linker when using gcc\n");
+    printf("  --linker=linker      The linker to use. \"lld\", \"gold\" or \"mold\". \"gold\" - Optional (the compile automatically chooses best option)\n");
     if(run) {
         printf("  --args <args...>     A list of arguments to run the program with\n");
     } else {
@@ -173,7 +173,7 @@ static void usageNew()
 
 static void usageTest()
 {
-    printf("Usage: sibs test [project_path] [--debug|--release] [--sanitize=(address|undefined|leak|thread|none)] [--linker=linker] [--file <filepath>...|--all-files]\n\n");
+    printf("Usage: sibs test [project_path] [--debug|--release] [--sanitize=(address|undefined|leak|thread|none)] [--linker=lld|gold|mold] [--file <filepath>...|--all-files]\n\n");
     printf("Build and run tests for a sibs project\n\n");
     printf("Options:\n");
     printf("  project_path         The directory containing a project.conf file - Optional (default: current directory)\n");
@@ -182,7 +182,7 @@ static void usageTest()
     printf("  --sanitize=option    Add runtime address/undefined behavior sanitization. Program can be up to 3 times slower and use 10 times as much RAM. Ignored if compiler doesn't support sanitization - Optional (default: none)\n");
     printf("  --file               Specify file to test, path to test file should be defined after this. Can be defined multiple times to test multiple files - Optional (default: not used), Only applicable for Zig\n");
     printf("  --all-files          Test all files - Optional (default: not used), Only applicable for Zig\n");
-    printf("  --linker=linker      The linker to use. \"lld\" or \"gold\" is the default linker when using gcc\n");
+    printf("  --linker=linker      The linker to use. \"lld\", \"gold\" or \"mold\". \"gold\" - Optional (the compile automatically chooses best option)\n");
     printf("  --skip-compile       Skip compilation. This can be used to generate a compile_commands.json file without compiling. Note that the compile_commands.json can miss files that are generated when this option is used. This option also skips running the tests\n");
     printf("  --args <args...>     A list of arguments to run the program with\n");
     printf("Examples:\n");
@@ -664,16 +664,22 @@ static int buildProject(int argc, const _tinydir_char_t **argv, bool run)
     Compiler compiler = Compiler::MSVC;
 #endif
 
-    // TODO: Make mold the default linker if it's installed and the installed gcc version supports it with -fuse-ld= option
     if(linker.empty()) {
         // Static object files compiled with gcc are not compatible with lld (llvm linker)
         // and we dont know which compiler was used to compile to code so we disable automatic
         // use of lld by default. The user can still force lld with --linker=lld, if they are
         // sure that they used clang to compile the code.
-        if(!use_lto && optimizationLevel != OPT_LEV_DEBUG && !include_debug_symbols_in_release && is_lld_linker_installed())
-            linker = "lld";
-        else if(is_gold_linker_installed())
+        // TODO: Detect if linker has change and recompile everything (that was compiled with a different linker).
+        if(!use_lto && optimizationLevel != OPT_LEV_DEBUG && !include_debug_symbols_in_release) {
+            if(is_mold_linker_installed())
+                linker = "mold";
+            else if(is_lld_linker_installed())
+                linker = "lld";
+            else if(is_gold_linker_installed())
+                linker = "gold";
+        } else if(is_gold_linker_installed()) {
             linker = "gold";
+        }
     }
 
     SibsConfig sibsConfig(compiler, projectPath, optimizationLevel, false);