diff options
Diffstat (limited to 'gcc/c-opts.c')
| -rw-r--r-- | gcc/c-opts.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/c-opts.c b/gcc/c-opts.c index a78c692..a637ffc 100644 --- a/gcc/c-opts.c +++ b/gcc/c-opts.c @@ -618,6 +618,10 @@ c_common_handle_option (size_t scode, const char *arg, int value) disable_builtin_function (arg); break; + case OPT_fdirectives_only: + cpp_opts->directives_only = 1; + break; + case OPT_fdollars_in_identifiers: cpp_opts->dollars_in_ident = value; break; @@ -1406,6 +1410,11 @@ sanitize_cpp_opts (void) if (flag_dump_macros == 'M') flag_no_output = 1; + /* By default, -fdirectives-only implies -dD. This allows subsequent phases + to perform proper macro expansion. */ + if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros) + flag_dump_macros = 'D'; + /* Disable -dD, -dN and -dI if normal output is suppressed. Allow -dM since at least glibc relies on -M -dM to work. */ /* Also, flag_no_output implies flag_no_line_commands, always. */ @@ -1436,6 +1445,14 @@ sanitize_cpp_opts (void) actually output the current directory? */ if (flag_working_directory == -1) flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE); + + if (cpp_opts->directives_only) + { + if (warn_unused_macros) + error ("-fdirectives-only is incompatible with -Wunused_macros"); + if (cpp_opts->traditional) + error ("-fdirectives-only is incompatible with -traditional"); + } } /* Add include path with a prefix at the front of its name. */ @@ -1519,6 +1536,8 @@ finish_options (void) } } } + else if (cpp_opts->directives_only) + cpp_init_special_builtins (parse_in); include_cursor = 0; push_command_line_include (); |