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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | # DP: Backport of PR c/25509, new option -Wno-unused-result (documentation)
gcc/
2009-07-10 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR 25509
PR 40614
* c.opt (Wunused-result): New.
* doc/invoke.texi: Document it.
* c-common.c (c_warn_unused_result): Use it.
gcc/testsuite/
2009-07-10 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR 25509
PR 40614
* g++.dg/warn/unused-result1-Werror.c: New.
Index: gcc/doc/invoke.texi
===================================================================
--- a/src/gcc/doc/invoke.texi (revision 149591)
+++ b/src/gcc/doc/invoke.texi (working copy)
@@ -260,7 +260,7 @@
-Wsystem-headers -Wtrigraphs -Wtype-limits -Wundef -Wuninitialized @gol
-Wunknown-pragmas -Wno-pragmas -Wunreachable-code @gol
-Wunused -Wunused-function -Wunused-label -Wunused-parameter @gol
--Wunused-value -Wunused-variable @gol
+-Wno-unused-result -Wunused-value -Wunused-variable @gol
-Wvariadic-macros -Wvla @gol
-Wvolatile-register-var -Wwrite-strings}
@@ -3193,6 +3193,13 @@
To suppress this warning use the @samp{unused} attribute
(@pxref{Variable Attributes}).
+@item -Wno-unused-result
+@opindex Wunused-result
+@opindex Wno-unused-result
+Do not warn if a caller of a function marked with attribute
+@code{warn_unused_result} (@pxref{Variable Attributes}) does not use
+its return value. The default is @option{-Wunused-result}.
+
@item -Wunused-variable
@opindex Wunused-variable
@opindex Wno-unused-variable
|