scripts: remove . from $PATH

Add CT_SanitizePath function which removes entries referring to ., /tmp
and non-existing directories from $PATH, and call it early in the
build script.

If . is in PATH, gcc-4.4.4 build breaks:

[ALL  ]    checking what assembler to use...
/tmp/build/targets/arm-unknown-linux-uclibcgnueabi/build/gcc-core-static/arm-unknown-linux-uclibcgnueabi/bin/as
...
[ALL  ]    config.status: creating as

i.e. "as" is supposed to be the arm-unknown-linux-uclibcgnueabi cross assembler,
but config.status creates a local "as" script which is calling the
host assembler.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
[Yann E. MORIN: style fixes + explanations]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

1 files changed, 18 insertions, 0 deletions

diff --git a/scripts/functions b/scripts/functions
index c284881e..0250f051 100644
--- a/scripts/functions
+++ b/scripts/functions
@@ -137,6 +137,24 @@ CT_DoEnd()
     CT_DoLog ${level:-INFO} "(elapsed: ${elapsed_min}:${elapsed_sec}.${elapsed_csec})"
 }
 
+# Remove entries referring to ., /tmp and non-existing directories from $PATH
+# Usage: CT_SanitizePath
+CT_SanitizePath() {
+    local new
+    local tmp
+    local IFS=:
+    for p in $PATH; do
+        # Replace any occurence of . with $(pwd -P)
+        # Use /tmp as a default if the directory is non-existent
+        # Do not add /tmp in the PATH
+        tmp="$( cd /tmp; cd "${p}" 2>/dev/null || true; pwd -P )"
+        if [ "${tmp}" != "/tmp" ]; then
+            new="${new}${new:+:}${p}"
+        fi
+    done
+    PATH="${new}"
+}
+
 # Abort the execution with an error message
 # Usage: CT_Abort <message>
 CT_Abort() {