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preprocessor: Support #warning for standard C2x

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ISO C2x standardizes the existing #warning extension.  Arrange
accordingly for it not to be diagnosed with -std=c2x -pedantic, but to
be diagnosed with -Wc11-c2x-compat.

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

gcc/testsuite/
	* gcc.dg/cpp/c11-warning-1.c, gcc.dg/cpp/c11-warning-2.c,
	gcc.dg/cpp/c11-warning-3.c, gcc.dg/cpp/c11-warning-4.c,
	gcc.dg/cpp/c2x-warning-1.c, gcc.dg/cpp/c2x-warning-2.c,
	gcc.dg/cpp/gnu11-warning-1.c, gcc.dg/cpp/gnu11-warning-2.c,
	gcc.dg/cpp/gnu11-warning-3.c, gcc.dg/cpp/gnu11-warning-4.c,
	gcc.dg/cpp/gnu2x-warning-1.c, gcc.dg/cpp/gnu2x-warning-2.c: New
	tests.

libcpp/
	* include/cpplib.h (struct cpp_options): Add warning_directive.
	* init.cc (struct lang_flags, lang_defaults): Add
	warning_directive.
	* directives.cc (DIRECTIVE_TABLE): Mark #warning as STDC2X not
	EXTENSION.
	(directive_diagnostics): Diagnose #warning with -Wc11-c2x-compat,
	or with -pedantic for a standard not supporting #warning.
This commit is contained in:
Joseph Myers 2022-08-18 23:01:01 +00:00
parent 8731aa9867
commit d7c3000147
15 changed files with 110 additions and 26 deletions
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3
libcpp/include/cpplib.h
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@ -513,6 +513,9 @@ struct cpp_options
/* Nonzero for the '#elifdef' and '#elifndef' directives. */
unsigned char elifdef;
/* Nonzero for the '#warning' directive. */
unsigned char warning_directive;
/* Nonzero means tokenize C++20 module directives. */
unsigned char module_directives;