Ability to set CMAKE_PREFIX_PATH from env vars

src/compiler.bbb

@@ -77,6 +77,8 @@ O = bits u32
 [extern] memcpy = fn [cc(c)] (destination: &u8, source: &u8, byte_count: u64) &u8;
 [extern] exit = fn [cc(c)] (exit_code: int) noreturn;
 
+[extern] getenv = fn [cc(c)] (env: &u8) &u8;
+
 [extern] realpath = fn [cc(c)] (source_path: &u8, resolved_path: &u8) &u8;
 [extern] mkdir = fn [cc(c)] (path: &u8, mode: mode_t) int;
 
@@ -18356,6 +18358,16 @@ compile_file = fn (arena: &Arena, compile_options: CompileFile, envp: &&u8) []u8
         .value = CMAKE_PREFIX_PATH,
     };
 
+    if (is_compiler)
+    {
+        >cmake_prefix_path_cstr = getenv("CMAKE_PREFIX_PATH");
+        if (cmake_prefix_path_cstr)
+        {
+            >cmake_prefix_path_value = c_string_to_slice(cmake_prefix_path_cstr);
+            cmake_prefix_path_definition.value = cmake_prefix_path_value;
+        }
+    }
+
     >objects = [ output_object_path ][..];
     >c_abi_library = "build/libc_abi.a";
     >llvm_bindings_library = "build/libllvm_bindings.a";

src/compiler.cpp

@@ -221,6 +221,16 @@ fn String compile_file(Arena* arena, Compile options)
         .value = cmake_prefix_path,
     };
 
+    if (is_compiler)
+    {
+        auto cmake_prefix_path_cstr = os_get_environment_variable("CMAKE_PREFIX_PATH");
+        if (cmake_prefix_path_cstr)
+        {
+            auto cmake_prefix_path_string = c_string_to_slice(cmake_prefix_path_cstr);
+            cmake_prefix_path_definition.value = cmake_prefix_path_string;
+        }
+    }
+
     String objects[] = {
         output_object_path,
     };

src/lib.cpp

@@ -225,3 +225,9 @@ Execution os_execute(Arena* arena, Slice<char* const> arguments, Slice<char* con
 
     return execution;
 }
+
+extern "C" char* getenv(const char*);
+char* os_get_environment_variable(const char* env)
+{
+    return getenv(env);
+}

src/lib.hpp

@@ -719,3 +719,4 @@ struct Execution
 };
 
 Execution os_execute(Arena* arena, Slice<char* const> arguments, Slice<char* const> environment, ExecuteOptions options);
+char* os_get_environment_variable(const char* env);