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preprocessor: Disable trigraphs for C2x

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ISO C2x removes trigraphs, so disable them accordingly for -std=c2x
(they can still be enabled using -trigraphs).

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

libcpp/
	* init.cc (lang_defaults): Disable trigraphs for C2x.

gcc/testsuite/
	* gcc.dg/cpp/c11-trigraphs-1.c, gcc.dg/cpp/c2x-trigraphs-1.c,
	gcc.dg/cpp/c2x-trigraphs-2.c: New tests.
This commit is contained in:
Joseph Myers 2022-09-05 22:05:06 +00:00
parent 5f895f2217
commit 5f38bf14bc
4 changed files with 21 additions and 1 deletions
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5
gcc/testsuite/gcc.dg/cpp/c11-trigraphs-1.c Normal file
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@ -0,0 +1,5 @@
/* Test trigraphs supported in C11. */
/* { dg-do run } */
/* { dg-options "-std=c11 -pedantic-errors" } */
#include "trigraphs.c"

10
gcc/testsuite/gcc.dg/cpp/c2x-trigraphs-1.c Normal file
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@ -0,0 +1,10 @@
/* Test trigraphs not supported in C2x. */
/* { dg-do compile } */
/* { dg-options "-std=c2x -pedantic-errors" } */
const char a[] = "??=??(??/??/??)??'??<??!??>??-";
const char b[] = "?""?=?""?(?""?/?""?/?""?)?""?'?""?<?""?!?""?>?""?-";
_Static_assert (sizeof a == sizeof b, "checking trigraph conversions");
/* { dg-prune-output "\\\[-Wtrigraphs" } */

5
gcc/testsuite/gcc.dg/cpp/c2x-trigraphs-2.c Normal file
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@ -0,0 +1,5 @@
/* Test trigraphs supported in C2x with -trigraphs used. */
/* { dg-do run } */
/* { dg-options "-std=c2x -pedantic-errors -trigraphs" } */
#include "trigraphs.c"

2
libcpp/init.cc
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@ -112,7 +112,7 @@ static const struct lang_flags lang_defaults[] =
/* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
/* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
/* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
/* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0 },
/* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0 },
/* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0 },
/* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0 },
/* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0 },