[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 --- Comment #9 from Martin Sebor --- Author: msebor Date: Mon Jun 20 15:46:09 2016 New Revision: 237606 URL: https://gcc.gnu.org/viewcvs?rev=237606=gcc=rev Log: PR c/69507 - bogus warning: ISO C does not allow __alignof__ (expression) gcc/testsuite/ChangeLog: * gnu89-const-expr-1.c: Avoid diagnosing __alignof__ as not conforming. * gnu90-const-expr-1.c: Same. * gnu99-const-expr-1.c: Same. * gnu99-static-1.c: Same. Modified: trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/gnu89-const-expr-1.c trunk/gcc/testsuite/gcc.dg/gnu90-const-expr-1.c trunk/gcc/testsuite/gcc.dg/gnu99-const-expr-1.c trunk/gcc/testsuite/gcc.dg/gnu99-static-1.c
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 --- Comment #7 from Martin Sebor --- Author: msebor Date: Sun Jun 19 16:11:40 2016 New Revision: 237582 URL: https://gcc.gnu.org/viewcvs?rev=237582=gcc=rev Log: PR c/69507 - bogus warning: ISO C does not allow ‘__alignof__ (expression)’ Added: trunk/gcc/testsuite/gcc.dg/alignof.c
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 Martin Sebor changed: What|Removed |Added Status|ASSIGNED|RESOLVED Resolution|--- |FIXED --- Comment #8 from Martin Sebor --- Fixed via r237581.
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 --- Comment #6 from Martin Sebor --- Author: msebor Date: Sun Jun 19 16:10:04 2016 New Revision: 237581 URL: https://gcc.gnu.org/viewcvs?rev=237581=gcc=rev Log: PR c/69507 - bogus warning: ISO C does not allow ‘__alignof__ (expression)’ gcc/testsuite/ChangeLog: PR c/69507 * gcc.dg/alignof.c: New test. gcc/c/ChangeLog: PR c/69507 * c-parser.c (c_parser_alignof_expression): Avoid diagnosing __alignof__ (expression). Modified: trunk/gcc/c/ChangeLog trunk/gcc/c/c-parser.c trunk/gcc/testsuite/ChangeLog
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 --- Comment #5 from Martin Sebor --- Patch posted for review: https://gcc.gnu.org/ml/gcc-patches/2016-05/msg02216.html
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 --- Comment #4 from Martin Sebor --- Created attachment 37483 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37483=edit Proposed patch. Attaching a proposed patch tested on x86_64-linux. Since GCC is in stage 4 (regression fixes only) and this is no a regression it will probably have to wait until after the 6.0 release.
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 Martin Sebor changed: What|Removed |Added Keywords||diagnostic Severity|normal |minor
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 --- Comment #1 from Andrew Pinski --- I don't think this is a bogus warning. -pedantic turns off all of GCC extensions including __attribute__ and asm support IIRC.
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507
--- Comment #2 from Martin Sebor ---
The manual says this about -Wpedantic:
-Wpedantic does not cause warning messages for use of the alternate keywords
whose names begin and end with '__'.
GCC accepts without a warning many extensions in pedantic mode, including
__attribute__((aligned)), __const__, and __inline__, all of which have
corresponding similar features in C, as well as __typeof__ which doesn't:
$ cat z.c && /home/msebor/build/gcc-trunk-git/gcc/xgcc
-B/home/msebor/build/gcc-trunk-git/gcc -S -Wall -Wextra -Wpedantic -std=c11 z.c
__const__ int a __attribute__ ((aligned));
__typeof__ (a) b;
__inline__ void f (void) { }
[Bug c/69507] bogus warning: ISO C does not allow ‘__alignof__ (expression)’
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69507 Martin Sebor changed: What|Removed |Added Status|UNCONFIRMED |ASSIGNED Last reconfirmed||2016-01-27 Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org Ever confirmed|0 |1 Known to fail||4.9.3, 5.1.0, 6.0 --- Comment #3 from Martin Sebor --- This seems like a simple matter of a missed conditional in the parser. The following change suppresses the warning. Let me add a test and post it for review. Index: gcc/c/c-parser.c === --- gcc/c/c-parser.c(revision 232841) +++ gcc/c/c-parser.c(working copy) @@ -7019,9 +7019,10 @@ c_parser_alignof_expression (c_parser *p mark_exp_read (expr.value); c_inhibit_evaluation_warnings--; in_alignof--; - pedwarn (start_loc, - OPT_Wpedantic, "ISO C does not allow %<%E (expression)%>", - alignof_spelling); + if (is_c11_alignof) + pedwarn (start_loc, +OPT_Wpedantic, "ISO C does not allow %<%E (expression)%>", +alignof_spelling); ret.value = c_alignof_expr (start_loc, expr.value); ret.original_code = ERROR_MARK; ret.original_type = NULL;
