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| author | Marek Polacek <polacek@redhat.com> | 2014-08-19 18:50:00 +0000 |
|---|---|---|
| committer | Marek Polacek <mpolacek@gcc.gnu.org> | 2014-08-19 18:50:00 +0000 |
| commit | 04159acfd818cbc29a9d12dfa2e83716c106f2c7 (patch) | |
| tree | c01c9d77dc28f6a4d017760a2f0f57809574d010 /gcc/doc | |
| parent | 8a2e8325e4b35265ea983561eca4a23a13630b07 (diff) | |
| download | gcc-04159acfd818cbc29a9d12dfa2e83716c106f2c7.zip gcc-04159acfd818cbc29a9d12dfa2e83716c106f2c7.tar.gz gcc-04159acfd818cbc29a9d12dfa2e83716c106f2c7.tar.bz2 | |
re PR c++/62153 (warn for bool expression compared with integer different from 0/1)
PR c++/62153
* doc/invoke.texi: Document -Wbool-compare.
c-family/
* c-common.c (maybe_warn_bool_compare): New function.
* c-common.h (maybe_warn_bool_compare): Declare.
* c.opt (Wbool-compare): New option.
c/
* c-typeck.c (build_binary_op): If either operand of a comparison
is a boolean expression, call maybe_warn_bool_compare.
cp/
* call.c (build_new_op_1): Remember the type of arguments for
a comparison. If either operand of a comparison is a boolean
expression, call maybe_warn_bool_compare.
testsuite/
* c-c++-common/Wbool-compare-1.c: New test.
From-SVN: r214183
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 8ea3689..b8e4294 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -240,6 +240,7 @@ Objective-C and Objective-C++ Dialects}. -pedantic-errors @gol -w -Wextra -Wall -Waddress -Waggregate-return @gol -Waggressive-loop-optimizations -Warray-bounds @gol +-Wbool-compare @gol -Wno-attributes -Wno-builtin-macro-redefined @gol -Wc90-c99-compat -Wc99-c11-compat @gol -Wc++-compat -Wc++11-compat -Wcast-align -Wcast-qual @gol @@ -4221,6 +4222,19 @@ This option is only active when @option{-ftree-vrp} is active (default for @option{-O2} and above). It warns about subscripts to arrays that are always out of bounds. This warning is enabled by @option{-Wall}. +@item -Wbool-compare +@opindex Wno-bool-compare +@opindex Wbool-compare +Warn about boolean expression compared with an integer value different from +@code{true}/@code{false}. For instance, the following comparison is +always false: +@smallexample +int n = 5; +@dots{} +if ((n > 1) == 2) @{ @dots{} @} +@end smallexample +This warning is enabled by @option{-Wall}. + @item -Wno-discarded-qualifiers @r{(C and Objective-C only)} @opindex Wno-discarded-qualifiers @opindex Wdiscarded-qualifiers |