diff options
Diffstat (limited to 'libbuild2/cc')
| -rw-r--r-- | libbuild2/cc/guess.cxx | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libbuild2/cc/guess.cxx b/libbuild2/cc/guess.cxx index d5fc884..182a997 100644 --- a/libbuild2/cc/guess.cxx +++ b/libbuild2/cc/guess.cxx @@ -2770,6 +2770,7 @@ namespace build2 // several times) so we cache the result. // static map<string, compiler_info> cache; + static mutex cache_mutex; const compiler_info& guess (const char* xm, @@ -2800,6 +2801,8 @@ namespace build2 if (x_lo != nullptr) append_options (cs, *x_lo); key = cs.string (); + mlock l (cache_mutex); + auto i (cache.find (key)); if (i != cache.end ()) return i->second; @@ -2949,7 +2952,15 @@ namespace build2 r.bin_pattern = p.directory ().representation (); // Trailing slash. } - return (cache[key] = move (r)); + // It's possible the cache entry already exists, in which case we + // ignore our value. + // + // But what if the compiler information it contains is different? Well, + // we don't generally deal with toolchain changes during the build so we + // ignore this special case as well. + // + mlock l (cache_mutex); + return cache.insert (make_pair (move (key), move (r))).first->second; } strings |