[U-Boot] [PATCH v5 7/9] moveconfig: Print a message for missing compiler

[Joe Hershberger]

A common case for failed builds is a missing compiler. Print a message
for that case to tell the user concisely which compiler was expected
that was not found.

This patch also has the effect of not printing build errors any longer.
The next patch will add a switch to optionally bring that back.

Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>

---

Changes in v5:
-Use scoped PIPE instead of importing it
-Set LANG=C for calling the compiler when planning to screen-scrape
-Use PIPE for all Popen
-Make missing compilers yellow

Changes in v4: None
Changes in v3: None
Changes in v2: None

 tools/moveconfig.py | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/tools/moveconfig.py b/tools/moveconfig.py
index 8b8eed6..2fa98e3 100755
--- a/tools/moveconfig.py
+++ b/tools/moveconfig.py
@@ -572,7 +572,8 @@ class Slot:
             return False
         cmd = list(self.make_cmd)
         cmd.append(defconfig)
-        self.ps = subprocess.Popen(cmd, stdout=self.devnull)
+        self.ps = subprocess.Popen(cmd, stdout=self.devnull,
+                                   stderr=subprocess.PIPE)
         self.defconfig = defconfig
         self.state = STATE_DEFCONFIG
         return True
@@ -597,11 +598,18 @@ class Slot:
             return False
 
         if self.ps.poll() != 0:
-
+            errmsg = 'Failed to process.'
+            errout = self.ps.stderr.read()
+            if errout.find('gcc: command not found') != -1:
+                errmsg = 'Compiler not found ('
+                errmsg += color_text(self.options.color, COLOR_YELLOW,
+                                     self.cross_compile)
+                errmsg += color_text(self.options.color, COLOR_LIGHT_RED,
+                                     ')')
             print >> sys.stderr, log_msg(self.options.color,
                                          COLOR_LIGHT_RED,
                                          self.defconfig,
-                                         "failed to process.")
+                                         errmsg),
             if self.options.exit_on_error:
                 sys.exit("Exit on error.")
             else:
@@ -619,7 +627,7 @@ class Slot:
             cmd = list(self.make_cmd)
             cmd.append('savedefconfig')
             self.ps = subprocess.Popen(cmd, stdout=self.devnull,
-                                       stderr=self.devnull)
+                                       stderr=subprocess.PIPE)
             self.state = STATE_SAVEDEFCONFIG
             return False
 
@@ -630,13 +638,17 @@ class Slot:
             self.state = STATE_IDLE
             return True
 
-        cross_compile = self.parser.get_cross_compile()
+        self.cross_compile = self.parser.get_cross_compile()
         cmd = list(self.make_cmd)
-        if cross_compile:
-            cmd.append('CROSS_COMPILE=%s' % cross_compile)
+        if self.cross_compile:
+            cmd.append('CROSS_COMPILE=%s' % self.cross_compile)
         cmd.append('KCONFIG_IGNORE_DUPLICATES=1')
         cmd.append('include/config/auto.conf')
-        self.ps = subprocess.Popen(cmd, stdout=self.devnull)
+        """This will be screen-scraped, so be sure the expected text will be
+        returned consistently on every machine by setting LANG=C"""
+        self.ps = subprocess.Popen(cmd, stdout=self.devnull,
+                                   env=dict(os.environ, LANG='C'),
+                                   stderr=subprocess.PIPE)
         self.state = STATE_AUTOCONF
         return False
 
-- 
1.7.11.5