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| author | Richard Guenther <rguenther@suse.de> | 2007-01-25 12:35:13 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2007-01-25 12:35:13 +0000 |
| commit | 16c1c158d80c9ebc5b72c89fbe16c6622e8c35cf (patch) | |
| tree | 38aed0de4ea56447e1382d524e34a85e4c8aed61 /gcc/doc | |
| parent | 04a91788394a9f8dbea4bd528584c502cfd004e6 (diff) | |
| download | gcc-16c1c158d80c9ebc5b72c89fbe16c6622e8c35cf.zip gcc-16c1c158d80c9ebc5b72c89fbe16c6622e8c35cf.tar.gz gcc-16c1c158d80c9ebc5b72c89fbe16c6622e8c35cf.tar.bz2 | |
invoke.texi (-Wcoverage-mismatch): Document.
2007-01-25 Richard Guenther <rguenther@suse.de>
* doc/invoke.texi (-Wcoverage-mismatch): Document.
* common.opt (-Wcoverage-mismatch): New warning option.
* coverage.c (get_coverage_counts): Ignore coverage mismatch
if -Wcoverage-mismatch is given.
* gcc.dg/tree-prof/tree-prof.exp: Define _PROFILE_GENERATE
and _PROFILE_USE.
* gcc.dg/tree-prof/wcoverage-mismatch.c: New testcase.
From-SVN: r121169
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 18fee96..fee5871 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -225,7 +225,7 @@ Objective-C and Objective-C++ Dialects}. -w -Wextra -Wall -Waggregate-return -Walways-true -Warray-bounds @gol -Wno-attributes -Wc++-compat -Wc++0x-compat -Wcast-align -Wcast-qual @gol -Wchar-subscripts -Wclobbered -Wcomment @gol --Wconversion -Wno-deprecated-declarations @gol +-Wconversion -Wcoverage-mismatch -Wno-deprecated-declarations @gol -Wdisabled-optimization -Wno-div-by-zero @gol -Wempty-body -Wno-endif-labels @gol -Werror -Werror-* -Werror-implicit-function-declaration @gol @@ -2282,6 +2282,20 @@ diagnostic emitted, which indicates which command line option directly controls that diagnostic, when such an option is known to the diagnostic machinery. +@item -Wcoverage-mismatch +@opindex Wcoverage-mismatch +Warn if feedback profiles do not match when using the +@option{-fprofile-use} option. +If a source file was changed between @option{-fprofile-gen} and +@option{-fprofile-use}, the files with the profile feedback can fail +to match the source file and GCC can not use the profile feedback +information. By default, GCC emits an error message in this case. +The option @option{-Wcoverage-mismatch} emits a warning instead of an +error. GCC does not use appropriate feedback profiles, so using this +option can result in poorly optimized code. This option is useful +only in the case of very minor changes such as bugfixes to an +existing code-base. + @end table @node Warning Options @@ -5613,6 +5627,10 @@ generally profitable only with profile feedback available. The following options are enabled: @code{-fbranch-probabilities}, @code{-fvpt}, @code{-funroll-loops}, @code{-fpeel-loops}, @code{-ftracer} +By default, GCC emits an error message if the feedback profiles do not +match the source code. This error can be turned into a warning by using +@option{-Wcoverage-mismatch}. Note this may result in poorly optimized +code. @end table The following options control compiler behavior regarding floating |