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| author | Rupert Swarbrick <rswarbrick@gmail.com> | 2020-05-27 09:33:49 +0100 |
|---|---|---|
| committer | Rupert Swarbrick <rswarbrick@gmail.com> | 2020-05-27 09:34:15 +0100 |
| commit | 0d9beb5b2eec3ba839faa58a1a775311d9c3376c (patch) | |
| tree | 8d927a947f50a04d27c114550b78b623707a6c8c /passes/cmds | |
| parent | a7f2ef6d34c4b336a910b3c6f3d2cc11da8a82b4 (diff) | |
| download | yosys-0d9beb5b2eec3ba839faa58a1a775311d9c3376c.tar.gz yosys-0d9beb5b2eec3ba839faa58a1a775311d9c3376c.tar.bz2 yosys-0d9beb5b2eec3ba839faa58a1a775311d9c3376c.zip | |
Silence warning in select.cc
With GCC 9.3, at least, compiling select.cc spits out a warning about
an implausible bound being passed to strncmp. This comes from inlining
IdString::compare(): it turns out that passing std::string::npos as a
bound to strncmp triggers it.
This patch replaces the compare call with a memcmp with the same
effect. The repeated calls to IdString::c_str are slightly
inefficient, but I'll address that in a follow-up commit.
Diffstat (limited to 'passes/cmds')
| -rw-r--r-- | passes/cmds/select.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/passes/cmds/select.cc b/passes/cmds/select.cc index 6e728c16f..c5ef72b1c 100644 --- a/passes/cmds/select.cc +++ b/passes/cmds/select.cc @@ -34,7 +34,10 @@ static bool match_ids(RTLIL::IdString id, std::string pattern) { if (id == pattern) return true; - if (id.size() > 0 && id[0] == '\\' && id.compare(1, std::string::npos, pattern.c_str()) == 0) + const char *id_c = id.c_str(); + if (*id_c == '\\' && + id.size() == 1 + pattern.size() && + memcmp(id_c + 1, pattern.c_str(), pattern.size()) == 0) return true; if (patmatch(pattern.c_str(), id.c_str())) return true; |