[OE-core] Problems running glibc test suite...

[Juro Bystricky]

I tried to run the glibc test suite and encountered various problems.
I build glibc as a part of core-image-minimal with libgcc and libstdc++, 
both additional libraries are needed by the glibc test suite.

By far most tests run just fine, but there are several tests that fail
to build at all. The offenders are:

/elf/tst-unique3cc
/elf/tst-unique4cc 
/elf/tst-unique3lib.cc 
/elf/tst-unique3lib2.cc. 

They all fail with an error:

 fatal error: cstdio: No such file or directory
 #include <cstdio>

The obvious reason is that the c++ header files were not found by the g++.
g++ was invoked with -nostdinc flag, and in that case the path to system include
files must be specified explicitly.

The failed build is a consequence of a series of unfortunate events.

First, when building the glibc for the first time, configure cannot find g++ 
compiler at all.  config.log states:

line 1594: arm-poky-linux-gnueabi-g++: command not found
configure:3165: $? = 127

Secondly, the g++ (which is not found) is then used to determine the location of the
include headers, resulting in
CXX_SYSINCLUDES=''

Thirdly, even if g++ is found (it is found when re-building glibc, see below),
the algorithm used to detect the CXX_SYSINCLUDES does not seem to work and 
the headers are not detected. I "fixed" this  by adding the following to git/configure:

@@ -5184,6 +5197,14 @@
       test "x$cxxheaders" != x &&
       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
     done
+    if test -z "$CXX_SYSINCLUDES"; then
+      cxxversion=`$CXX -dumpversion` 
+      cxxmachine=`$CXX -dumpmachine` 
+      CXX_SYSINCLUDES=" -isystem $sysheaders/c++/$cxxversion \
+-isystem $sysheaders/c++/$cxxversion/$cxxmachine"
+    { $as_echo "$as_me:${as_lineno-$LINENO}: guessing CXX_SYSINCLUDES: $CXX_SYSINCLUDES" >&5
+$as_echo_n "guessing CXX_SYSINCLUDE: $CXX_SYSINCLUDES... " >&6; }
+    fi
   fi
 fi

After the core-image-minimal is built, by the time the test suite is run, g++ is present, 
but CXX_SYSINCLUDES  is still not correct (unless the "fix" above is applied). However, 
not all c++ tests require c++ headers,  so some will build correctly. I tested the "fix" 
successfully with qemux86-64, qemumips and qemuarm. 
(qemuarm exposed some additional problems though).

The "fix" is just a proof of concept: with correct CXX system header paths all 
the offending programs build correctly. But this "fix" only works when re-building 
glibc after the core-image-minimal is built.

The g++ compiler is not needed for glibc at all, it is only needed to build 
some of the tests in the testsuite.  Probably worth noting is that glibc cannot DEPEND on 
g++  due to circular dependencies.

The proper way to fix this would be to initialize CXX_SYSINCLUDES before building/running the test suite 
and not before building the glibc.
A suitable place for this seems to be recipes-core/glibc/glibc-testing.inc

Any thoughts?

Thanks

Juro



 		 	   		  
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