Incorporate project environment checksum into cc::compiler_info cache key

1 files changed, 12 insertions, 0 deletions

diff --git a/libbuild2/bin/guess.cxx b/libbuild2/bin/guess.cxx
index 219b8e8..8dd3cb6 100644
--- a/libbuild2/bin/guess.cxx
+++ b/libbuild2/bin/guess.cxx
@@ -363,6 +363,9 @@ namespace build2
     //    will need to figure out what's important (some of them are clearly
     //    for debugging of ld itself).
     //
+    // See also the note on environment and caching below if adding any new
+    // variables.
+    //
     static const char* gnu_ld_env[] = {
       "LD_RUN_PATH", "GNUTARGET", "LDEMULATION", "COLLECT_NO_DEMANGLE", nullptr};
 
@@ -381,6 +384,9 @@ namespace build2
 
       // First check the cache.
       //
+      // Note that none of the information that we cache can be affected by
+      // the environment.
+      //
       string key;
       {
         sha256 cs;
@@ -569,6 +575,9 @@ namespace build2
 
     // Resource compiler environment variables.
     //
+    // See also the note on environment and caching below if adding any new
+    // variables.
+    //
     static const char* msvc_rc_env[] = {"INCLUDE", nullptr};
 
     // Extracting rc information requires running it which can become
@@ -583,6 +592,9 @@ namespace build2
 
       // First check the cache.
       //
+      // Note that none of the information that we cache can be affected by
+      // the environment.
+      //
       string key;
       {
         sha256 cs;