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| author | Paolo Bonzini <bonzini@gnu.org> | 2016-11-23 10:06:07 +0000 |
|---|---|---|
| committer | Paolo Bonzini <bonzini@gcc.gnu.org> | 2016-11-23 10:06:07 +0000 |
| commit | fb2675cb4683a430fb63af44713cd9d2fcd77b97 (patch) | |
| tree | 08fdcd7bc342d222856765ef9f8cff24381b75a7 /gcc/doc/cpp.texi | |
| parent | baf53c4739a68b3307ce28bfeffc903fa641b946 (diff) | |
| download | gcc-fb2675cb4683a430fb63af44713cd9d2fcd77b97.tar.gz | |
system.h (HAVE_DESIGNATED_INITIALIZERS, [...]): Do not use "defined" in macros.
gcc:
2016-11-23 Paolo Bonzini <bonzini@gnu.org>
* system.h (HAVE_DESIGNATED_INITIALIZERS,
HAVE_DESIGNATED_UNION_INITIALIZERS): Do not use
"defined" in macros.
* doc/cpp.texi (Defined): Mention -Wexpansion-to-defined.
* doc/cppopts.texi (Invocation): Document -Wexpansion-to-defined.
* doc/invoke.texi (Warning Options): Document -Wexpansion-to-defined.
gcc/c-family:
2016-11-23 Paolo Bonzini <bonzini@gnu.org>
* c.opt (Wexpansion-to-defined): New.
gcc/testsuite:
2016-11-23 Paolo Bonzini <bonzini@gnu.org>
* gcc.dg/cpp/defined.c: Mark newly introduced warnings and
adjust for warning->pedwarn change.
* gcc.dg/cpp/defined-syshdr.c,
gcc.dg/cpp/defined-Wexpansion-to-defined.c,
gcc.dg/cpp/defined-Wextra-Wno-expansion-to-defined.c,
gcc.dg/cpp/defined-Wextra.c,
gcc.dg/cpp/defined-Wno-expansion-to-defined.c: New testcases.
libcpp:
2016-11-23 Paolo Bonzini <bonzini@gnu.org>
* include/cpplib.h (struct cpp_options): Add new member
warn_expansion_to_defined.
(CPP_W_EXPANSION_TO_DEFINED): New enum member.
* expr.c (parse_defined): Warn for all uses of "defined"
in macros, and tie warning to CPP_W_EXPANSION_TO_DEFINED.
Make it a pedwarning instead of a warning.
* system.h (HAVE_DESIGNATED_INITIALIZERS): Do not use
"defined" in macros.
From-SVN: r242743
Diffstat (limited to 'gcc/doc/cpp.texi')
| -rw-r--r-- | gcc/doc/cpp.texi | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi index ed91767bc96..49aa95369a0 100644 --- a/gcc/doc/cpp.texi +++ b/gcc/doc/cpp.texi @@ -3369,7 +3369,9 @@ If the @code{defined} operator appears as a result of a macro expansion, the C standard says the behavior is undefined. GNU cpp treats it as a genuine @code{defined} operator and evaluates it normally. It will warn wherever your code uses this feature if you use the command-line option -@option{-pedantic}, since other compilers may handle it differently. +@option{-Wpedantic}, since other compilers may handle it differently. The +warning is also enabled by @option{-Wextra}, and can also be enabled +individually with @option{-Wexpansion-to-defined}. @node Else @subsection Else |