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-rw-r--r--libbuild2/cc/guess.cxx18
1 files changed, 17 insertions, 1 deletions
diff --git a/libbuild2/cc/guess.cxx b/libbuild2/cc/guess.cxx
index b7fd28c..298d081 100644
--- a/libbuild2/cc/guess.cxx
+++ b/libbuild2/cc/guess.cxx
@@ -2309,7 +2309,7 @@ namespace build2
const strings* c_lo, const strings* x_lo,
guess_result&& gr, sha256& cs)
{
- // This function handles vanialla Clang, including its clang-cl variant,
+ // This function handles vanilla Clang, including its clang-cl variant,
// as well as Apple and Emscripten variants.
//
// The clang-cl variant appears to be a very thin wrapper over the
@@ -2501,6 +2501,22 @@ namespace build2
});
var_ver = extract_version (gr.signature, false, "Emscripten");
+
+ // The official Emscripten distributions routinely use unreleased
+ // Clang snapshots which nevertheless have the next release version
+ // (which means it's actually somewhere between the previous release
+ // and the next release). On the other hand, distributions like Debian
+ // package it to use their Clang package which normally has the
+ // accurate version. So here we will try to detect the former and
+ // similar to the Apple case we will conservatively adjust it to the
+ // previous release.
+ //
+ if (gr.type_signature.find ("googlesource") != string::npos)
+ {
+ if (ver.patch != 0) ver.patch--;
+ else if (ver.minor != 0) ver.minor--;
+ else ver.major--;
+ }
}
// Figure out the target architecture.