base.bbclass: Add comments for gcc links to ccache

(From OE-Core rev: ce6bf125aba7344d56368885605949e373b06393)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index e715ffa1b2..e6af673847 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -122,6 +122,10 @@ def setup_hosttools_dir(dest, toolsvar, d, fatal=True):
         desttool = os.path.join(dest, tool)
         if not os.path.exists(desttool):
             srctool = bb.utils.which(path, tool, executable=True)
+            # gcc/g++ may link to ccache on some hosts, e.g.,
+            # /usr/local/bin/ccache/gcc -> /usr/bin/ccache, then which(gcc)
+            # would return /usr/local/bin/ccache/gcc, but what we need is
+            # /usr/bin/gcc, this code can check and fix that.
             if "ccache" in srctool:
                 srctool = bb.utils.which(path, tool, executable=True, direction=1)
             if srctool: