Hello everyone! First, let me ask for your patience -- this is the first patch I am submitting to gcc. I tried very hard to follow the proper procedure, but I am sure that I've missed something.
According to https://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm-Labels asm labels have no effect on anything other than variable and function declarations. When an asm label is included on a typedef, the compiler happily goes along but does not indicate anything to the user. For instance, when parsing typedef struct {} x asm ("X"); the compiler silently discards the asm label. This patch will generate a warning (at -Wpedantic) for such a situation. This is in Bugzilla as 85444. Again, I hope that I have done all the proper formatting so that it is inline with all the contribution guidelines. Thank you for your patience! Will 2018-04-18 Will Hawkins <wh...@virginia.edu> * gcc/c/c-decl.c: Warn about ignored asm label for typedef declaration * gcc/cp/decl.c: Warn about ignored asm label for typedef declaration diff --git a/gcc/c/c-decl.c b/gcc/c/c-decl.c index f0198ec..e9c0a72 100644 --- a/gcc/c/c-decl.c +++ b/gcc/c/c-decl.c @@ -5166,7 +5166,11 @@ finish_decl (tree decl, location_t init_loc, tree init, if (!DECL_FILE_SCOPE_P (decl) && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl)); - + if (asmspec_tree != NULL_TREE) + { + warning (OPT_Wpedantic, "asm-specifier is ignored in " + "typedef declaration"); + } rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); } diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c index 44a152b..88b4b94 100644 --- a/gcc/cp/decl.c +++ b/gcc/cp/decl.c @@ -7069,6 +7069,11 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p, /* Take care of TYPE_DECLs up front. */ if (TREE_CODE (decl) == TYPE_DECL) { + if (asmspec_tree != NULL_TREE) + { + warning (OPT_Wpedantic, "asm-specifier is ignored for " + "typedef declarations"); + } if (type != error_mark_node && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl)) {
