Workaround an ICE when using modules with gcc 14.2 and earlier

Author: vitaut

CMakeLists.txt

@@ -69,8 +69,6 @@ function(add_module_library name)
     target_compile_options(${name} PUBLIC -fmodules-ts)
   endif ()
 
-  target_compile_definitions(${name} PRIVATE FMT_MODULE)
-
   if (FMT_USE_CMAKE_MODULES)
     target_sources(${name} PUBLIC FILE_SET fmt TYPE CXX_MODULES
                    FILES ${sources})

include/fmt/base.h

@@ -299,7 +299,7 @@
 
 // Enable minimal optimizations for more compact code in debug mode.
 FMT_PRAGMA_GCC(push_options)
-#if !defined(__OPTIMIZE__) && !defined(__CUDACC__)
+#if !defined(__OPTIMIZE__) && !defined(__CUDACC__) && !defined(FMT_MODULE)
 FMT_PRAGMA_GCC(optimize("Og"))
 #endif
 FMT_PRAGMA_CLANG(diagnostic push)

src/fmt.cc

@@ -1,5 +1,7 @@
 module;
 
+#define FMT_MODULE
+
 #ifdef _MSVC_LANG
 #  define FMT_CPLUSPLUS _MSVC_LANG
 #else