build: Add -Werror=unused... compile flags #21458
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The following sections might be updated with supplementary metadata relevant to reviewers and maintainers. ConflictsReviewers, this pull request conflicts with the following ones:
If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first. |
This was referenced Mar 17, 2021
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Concept ACK, but why the removal of Could you describe some tests cases that could be used to verify that the patch in this PR makes the build fail where we expect it to fail? |
-Wunused-local-typedef(s) is covered by -Wunused in both gcc and clang. No new warnings fire when compiling.
Added flags are disabled by default. No new warnings fire when compiling.
Added flag is disabled by default for C++. No new warnings fire when compiling.
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Rebased 22dd4fb -> 424683d (pr21458.01 -> pr21458.02). |
This was referenced Oct 1, 2021
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🐙 This pull request conflicts with the target branch and needs rebase. Want to unsubscribe from rebase notifications on this pull request? Just convert this pull request to a "draft". |
fanquake
reviewed
Oct 13, 2021
| @@ -445,8 +448,10 @@ if test "x$CXXFLAGS_overridden" = "xno"; then | |||
| AX_CHECK_COMPILE_FLAG([-Wthread-safety],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wthread-safety"],,[[$CXXFLAG_WERROR]]) | |||
| AX_CHECK_COMPILE_FLAG([-Wrange-loop-analysis],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wrange-loop-analysis"],,[[$CXXFLAG_WERROR]]) | |||
| AX_CHECK_COMPILE_FLAG([-Wredundant-decls],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-decls"],,[[$CXXFLAG_WERROR]]) | |||
| AX_CHECK_COMPILE_FLAG([-Wunused-variable],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused-variable"],,[[$CXXFLAG_WERROR]]) | |||
| AX_CHECK_COMPILE_FLAG([-Wunused-member-function],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused-member-function"],,[[$CXXFLAG_WERROR]]) | |||
| AX_CHECK_COMPILE_FLAG([-Wunused], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused"], [], [$CXXFLAG_WERROR]) | |||
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In 86bb9d8: -Wunused is already part of -Wall (via -Wmost) for Clang, and is implied by -Wall for GCC, so this should be redundant.
fanquake
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Oct 14, 2021
aa69fd6 build: Drop -Wno-unused-local-typedef (Hennadii Stepanov) 672e8c5 build: remove -Wunused-variable (fanquake) 5239af0 build: remove -Wswitch (fanquake) 0375906 build: use loop-analysis over range-loop-analysis (fanquake) 12712fa build: remove -Wsign-compare (fanquake) Pull request description: This remove the addition of flags that are already part of other options, such as `-Wall` or `-Wextra`; see each commit message for details. All of the flags being removed here already exist as part of `-Wall` as of GCC 8, or, for Clang, all exist in `-Wmost` (included in `-Wall)`, or as part of `-Wextra` as of Clang 7. Both of which are our minimum required compilers. Also cherry-picks one change from #21458. To give an example of how GCCs `-Wall` has changed over the last few releases: ### 11.x to trunk (12.x) Added: ```bash -Wzero-length-bounds -Wmismatched-dealloc -Wmismatched-new-delete (only for C/C++) ``` ### 10.x to 11.x Added: ```bash -Warray-parameter=2 (C and Objective-C only) -Wrange-loop-construct (only for C++) -Wsizeof-array-div -Wvla-parameter (C and Objective-C only) ``` Removed: ```bash -Wenum-conversion in C/ObjC; ``` ### 9.x to 10.x Added: ```bash -Wenum-conversion in C/ObjC; -Wformat-overflow -Wformat-truncation -Wzero-length-bounds ``` ### 8.x to 9.x Added: ```bash -Wpessimizing-move ``` Removed: ```bash -Wstringop-truncation ``` ### 7.x to 8.x Added: ```bash -Wcatch-value (C++ and Objective-C++ only) -Wmissing-attributes -Wmultistatement-macros -Wrestrict -Wsizeof-pointer-div -Wstringop-truncation ``` [Clang Warning Options](https://clang.llvm.org/docs/DiagnosticsReference.html) [GCC Warning Options](https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html) ACKs for top commit: meshcollider: utACK aa69fd6 Tree-SHA512: 34dde6bd773c864202c151eaa35f902d03fb531c27fe5e1ef659225da03acade2efe5df56df3efb4df5bbded3d395348ce03c25b837fce83be53af3352f0f2bc
sidhujag
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Oct 14, 2021
aa69fd6 build: Drop -Wno-unused-local-typedef (Hennadii Stepanov) 672e8c5 build: remove -Wunused-variable (fanquake) 5239af0 build: remove -Wswitch (fanquake) 0375906 build: use loop-analysis over range-loop-analysis (fanquake) 12712fa build: remove -Wsign-compare (fanquake) Pull request description: This remove the addition of flags that are already part of other options, such as `-Wall` or `-Wextra`; see each commit message for details. All of the flags being removed here already exist as part of `-Wall` as of GCC 8, or, for Clang, all exist in `-Wmost` (included in `-Wall)`, or as part of `-Wextra` as of Clang 7. Both of which are our minimum required compilers. Also cherry-picks one change from bitcoin#21458. To give an example of how GCCs `-Wall` has changed over the last few releases: ### 11.x to trunk (12.x) Added: ```bash -Wzero-length-bounds -Wmismatched-dealloc -Wmismatched-new-delete (only for C/C++) ``` ### 10.x to 11.x Added: ```bash -Warray-parameter=2 (C and Objective-C only) -Wrange-loop-construct (only for C++) -Wsizeof-array-div -Wvla-parameter (C and Objective-C only) ``` Removed: ```bash -Wenum-conversion in C/ObjC; ``` ### 9.x to 10.x Added: ```bash -Wenum-conversion in C/ObjC; -Wformat-overflow -Wformat-truncation -Wzero-length-bounds ``` ### 8.x to 9.x Added: ```bash -Wpessimizing-move ``` Removed: ```bash -Wstringop-truncation ``` ### 7.x to 8.x Added: ```bash -Wcatch-value (C++ and Objective-C++ only) -Wmissing-attributes -Wmultistatement-macros -Wrestrict -Wsizeof-pointer-div -Wstringop-truncation ``` [Clang Warning Options](https://clang.llvm.org/docs/DiagnosticsReference.html) [GCC Warning Options](https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html) ACKs for top commit: meshcollider: utACK aa69fd6 Tree-SHA512: 34dde6bd773c864202c151eaa35f902d03fb531c27fe5e1ef659225da03acade2efe5df56df3efb4df5bbded3d395348ce03c25b837fce83be53af3352f0f2bc
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This needs a rebase, and comments addressed, or can probably be closed. |
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With C++17
[[maybe_unused]]attribute it is easy to keep emerged cases in the new code under control.This PR does not touch
-Wno-unused-parameteras it requires too much of code churning.Compiler specific notes:
-Wunused-macrosnot added because it requires a non-trivial checking in theconfigurescript, and it blames onlybitcoin/src/util/system.cpp
Line 34 in a9d1b40
-Wunused-templatenot added because some of our templates are buried into macros-Wused-but-marked-unusedproduces tones of warnings in boost tests-Werror=unused-const-variablewith level 2 seems not suitable for C++ code