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Support decimal floating-point constants in C2x.

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ISO C2x adds decimal floating point as an optional standard feature.
This patch accordingly makes GCC accept DFP constants (DF, DD, DL, df,
dd, dl suffixes) in strict C2X mode, with a pedwarn-if-pedantic for
older standards and a warning with -Wc11-c2x-compat even in C2x mode
(which in turn requires -Wc11-c2x-compat to be newly passed through to
libcpp).

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

gcc/c-family:
	* c.opt (Wc11-c2x-compat): Add CPP(cpp_warn_c11_c2x_compat)
	CppReason(CPP_W_C11_C2X_COMPAT).

gcc/testsuite:
	* gcc.dg/dfp/c11-constants-1.c, gcc.dg/dfp/c11-constants-2.c,
	gcc.dg/dfp/c2x-constants-1.c, gcc.dg/dfp/c2x-constants-2.c: New
	tests.
	* gcc.dg/dfp/constants-pedantic.c: Use -std=gnu17 explicitly.
	Update expected diagnostics.

libcpp:
	* include/cpplib.h (struct cpp_options): Add dfp_constants and
	cpp_warn_c11_c2x_compat.
	(enum cpp_warning_reason): Add CPP_W_C11_C2X_COMPAT.
	* init.c (struct lang_flags): Add dfp_constants.
	(lang_defaults): Set dfp_constants to 1 for GNUC2X and STDC2X and
	0 for other languages.
	(cpp_set_lang): Set dfp_constants from language.
	(cpp_create_reader): Set cpp_warn_c11_c2x_compat to -1.
	* expr.c (interpret_float_suffix): Mention DFP constants as C2X in
	comment.
	(cpp_classify_number): Do not diagnose DFP constants for languages
	setting dfp_constants, unless cpp_warn_c11_c2x_compat.

From-SVN: r276908
This commit is contained in:
Joseph Myers 2019-10-11 23:22:52 +01:00 • committed by Joseph Myers
parent 53f3c1a103
commit 175a85b297
12 changed files with 133 additions and 36 deletions
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7
libcpp/include/cpplib.h
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@ -480,6 +480,9 @@ struct cpp_options
/* Nonzero for C++ 2014 Standard digit separators. */
unsigned char digit_separators;
/* Nonzero for C2X decimal floating-point constants. */
unsigned char dfp_constants;
/* Nonzero for C++2a __VA_OPT__ feature. */
unsigned char va_opt;
@ -508,6 +511,9 @@ struct cpp_options
/* True if warn about differences between C90 and C99. */
signed char cpp_warn_c90_c99_compat;
/* True if warn about differences between C11 and C2X. */
signed char cpp_warn_c11_c2x_compat;
/* True if warn about differences between C++98 and C++11. */
bool cpp_warn_cxx11_compat;
@ -607,6 +613,7 @@ enum cpp_warning_reason {
CPP_W_DATE_TIME,
CPP_W_PEDANTIC,
CPP_W_C90_C99_COMPAT,
CPP_W_C11_C2X_COMPAT,
CPP_W_CXX11_COMPAT,
CPP_W_EXPANSION_TO_DEFINED
};