diff options
Diffstat (limited to 'gcc/cppmacro.c')
| -rw-r--r-- | gcc/cppmacro.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/gcc/cppmacro.c b/gcc/cppmacro.c index f9c935f..c7a08f2 100644 --- a/gcc/cppmacro.c +++ b/gcc/cppmacro.c @@ -172,10 +172,20 @@ builtin_macro (pfile, node) pfile->cur_token[-1].line)); break; + /* __STDC__ has the value 1 under normal circumstances. + However, if (a) we are in a system header, (b) the option + stdc_0_in_system_headers is true, and (c) __STRICT_ANSI__ is + not defined, then it has the value 0. */ case BT_STDC: { - int stdc = (!CPP_IN_SYSTEM_HEADER (pfile) - || pfile->spec_nodes.n__STRICT_ANSI__->type != NT_VOID); + int stdc; + if (CPP_IN_SYSTEM_HEADER (pfile) + && CPP_OPTION (pfile, stdc_0_in_system_headers) + && pfile->spec_nodes.n__STRICT_ANSI__->type == NT_VOID) + stdc = 0; + else + stdc = 1; + result = new_number_token (pfile, stdc); } break; |