From 1bf3abc6343bc5b14c13bc402ffcdd4bbd6c7f40 Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Fri, 29 Apr 2022 14:21:11 -0700 Subject: [PATCH] Silence unused-but-set-variable warnings Clang 13.0.0 added support for `Wunused-but-set-parameter` and `-Wunused-but-set-variable` which correctly detects two unused variables in zstd resulting in a build failure. This commit annotates these instances accordingly. https://releases.llvm.org/13.0.1/tools/clang/docs/ReleaseNotes.html#id6 In FSE_createCTable(), malloc() is intentionally defined as NULL when compiled in the kernel so the variable is unused. zstd/lib/compress/fse_compress.c:307:12: error: variable 'size' set but not used [-Werror,-Wunused-but-set-variable] Additionally, in ZSTD_seqDecompressedSize() the assert is compiled out similarly resulting in an unused variable. zstd/lib/compress/zstd_compress_superblock.c:412:12: error: variable 'litLengthSum' set but not used [-Werror,-Wunused-but-set-variable] Reviewed-by: Rich Ercolani Signed-off-by: Brian Behlendorf Closes #13382 --- module/zstd/lib/compress/fse_compress.c | 2 +- module/zstd/lib/compress/zstd_compress_superblock.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/module/zstd/lib/compress/fse_compress.c b/module/zstd/lib/compress/fse_compress.c index a42759814fdd..e27414ccbbcd 100644 --- a/module/zstd/lib/compress/fse_compress.c +++ b/module/zstd/lib/compress/fse_compress.c @@ -304,7 +304,7 @@ size_t FSE_writeNCount (void* buffer, size_t bufferSize, FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog) { - size_t size; + size_t size __attribute__ ((unused)); if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX; size = FSE_CTABLE_SIZE_U32 (tableLog, maxSymbolValue) * sizeof(U32); return (FSE_CTable*)malloc(size); diff --git a/module/zstd/lib/compress/zstd_compress_superblock.c b/module/zstd/lib/compress/zstd_compress_superblock.c index b693866c0ac1..ffa4bb67597f 100644 --- a/module/zstd/lib/compress/zstd_compress_superblock.c +++ b/module/zstd/lib/compress/zstd_compress_superblock.c @@ -409,7 +409,7 @@ static size_t ZSTD_seqDecompressedSize(seqStore_t const* seqStore, const seqDef* const seqDef* const send = sequences + nbSeq; const seqDef* sp = sstart; size_t matchLengthSum = 0; - size_t litLengthSum = 0; + size_t litLengthSum __attribute__ ((unused)) = 0; while (send-sp > 0) { ZSTD_sequenceLength const seqLen = ZSTD_getSequenceLength(seqStore, sp); litLengthSum += seqLen.litLength;