Fixed a bug during bootstrap

Fixed #1732

RELNOTES:

--
MOS_MIGRATED_REVID=132436686

1 files changed, 4 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/windows/WindowsSubprocessFactory.java b/src/main/java/com/google/devtools/build/lib/windows/WindowsSubprocessFactory.java
index fbd0cdd3dc..965a18672e 100644
--- a/src/main/java/com/google/devtools/build/lib/windows/WindowsSubprocessFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/windows/WindowsSubprocessFactory.java
@@ -109,7 +109,10 @@ public class WindowsSubprocessFactory implements Subprocess.Factory {
     StringBuilder result = new StringBuilder();
     for (Map.Entry<String, String> entry : realEnv.entrySet()) {
       if (entry.getKey().contains("=")) {
-        throw new IOException("Environment variable names must not contain '='");
+        // lpEnvironment requires no '=' in environment variable name, but on Windows,
+        // System.getenv() returns environment variables like '=C:' or '=ExitCode', so it can't
+        // be an error, we have ignore them here.
+        continue;
       }
       result.append(entry.getKey() + "=" + entry.getValue() + "\0");
     }