🎨 Provide better control over freestanding

CMakeLists.txt

@@ -61,6 +61,7 @@ target_sources(
               include/stdx/cx_vector.hpp
               include/stdx/detail/bitset_common.hpp
               include/stdx/detail/fmt.hpp
+              include/stdx/detail/freestanding.hpp
               include/stdx/detail/list_common.hpp
               include/stdx/env.hpp
               include/stdx/for_each_n_args.hpp

include/stdx/detail/fmt.hpp

@@ -1,6 +1,10 @@
 #pragma once
 
-#if not STDX_FMT_FREESTANDING
+#include <stdx/detail/freestanding.hpp>
+
+// NOLINTBEGIN(cppcoreguidelines-macro-usage)
+
+#ifndef STDX_FREESTANDING
 
 #include <fmt/compile.h>
 #include <fmt/format.h>
@@ -172,3 +176,5 @@ CONSTEVAL auto format_to(It dest, auto fmtstr, auto v) -> void {
 } // namespace stdx
 
 #endif
+
+// NOLINTEND(cppcoreguidelines-macro-usage)

include/stdx/detail/freestanding.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#ifdef SIMULATE_FREESTANDING
+#define STDX_FREESTANDING
+#endif

test/CMakeLists.txt

@@ -95,7 +95,7 @@ if(${CMAKE_CXX_STANDARD} GREATER_EQUAL 20)
         warnings
         stdx)
     target_compile_definitions(ct_format_freestanding_test
-                               PRIVATE -DSTDX_FMT_FREESTANDING=1)
+                               PRIVATE STDX_FREESTANDING)
 endif()
 
 add_subdirectory(fail)

test/ct_format.cpp

@@ -106,7 +106,7 @@ TEST_CASE("format a compile-time argument with different base", "[ct_format]") {
                    "Hello 0x2a"_fmt_res);
 }
 
-#if not STDX_FMT_FREESTANDING
+#ifndef STDX_FREESTANDING
 TEST_CASE("format a compile-time argument with fmt spec", "[ct_format]") {
     STATIC_REQUIRE(stdx::ct_format<"Hello {:*>#6x}">(CX_VALUE(42)) ==
                    "Hello **0x2a"_fmt_res);

usage_test/CMakeLists.txt

@@ -12,6 +12,6 @@ cpmaddpackage(NAME stdx SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/.." GIT_TAG HEAD)
 add_executable(app main.cpp)
 target_link_libraries(app PRIVATE stdx)
 if(CPP_IMPLEMENTATION STREQUAL "FREESTANDING")
-    target_compile_definitions(app PRIVATE STDX_FMT_FREESTANDING)
+    target_compile_definitions(app PRIVATE SIMULATE_FREESTANDING)
     target_compile_options(app PRIVATE -ffreestanding)
 endif()