Iain Sandoe <developer@sandoe-acoustics.co.uk> writes:

> It looks like the gnat testsuite is also broken - but HP's fix doesn't
> recover that.
> .. will try and take a look - but short on time today,

I think I see what's going on: in gnat.log, I find

Running /vol/gcc/src/hg/trunk/local/gcc/testsuite/gnat.dg/dg.exp ...
ERROR: tcl error sourcing library file /vol/gcc/src/hg/trunk/local/gcc/testsuite/lib/gcc-dg.exp.
can't read "GCC_UNDER_TEST": no such variable
can't read "GCC_UNDER_TEST": no such variable
    while executing
"lappend options "compiler=$GCC_UNDER_TEST""
    (procedure "gcc_target_compile" line 37)
    invoked from within
"gcc_target_compile $source $dest $type $options"
    invoked from within
"if [ string match "*.c" $source ] then {
	return [gcc_target_compile $source $dest $type $options]
    }"
    (procedure "gnat_target_compile" line 12)
    invoked from within
"${tool}_target_compile $src $output $compile_type "$options""
    (procedure "check_compile" line 39)
    invoked from within
"check_compile linker_plugin executable {
     int main() { return 0; }
  } {-flto -fuse-linker-plugin}"
    ("eval" body line 1)
    invoked from within
"eval check_compile $args"
    (procedure "check_no_compiler_messages_nocache" line 2)
    invoked from within
"check_no_compiler_messages_nocache linker_plugin executable {
     int main() { return 0; }
  } "-flto -fuse-linker-plugin""
    (procedure "check_linker_plugin_available" line 2)
    invoked from within
"check_linker_plugin_available"
    invoked from within
"if [check_effective_target_lto] {
    # When having plugin test both slim and fat LTO and plugin/nonplugin
    # path.
    if [check_linker_plugin_ava..."
    (file "/vol/gcc/src/hg/trunk/local/gcc/testsuite/lib/gcc-dg.exp" line 71)
    invoked from within
"source /vol/gcc/src/hg/trunk/local/gcc/testsuite/lib/gcc-dg.exp"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 source /vol/gcc/src/hg/trunk/local/gcc/testsuite/lib/gcc-dg.exp"

If running the gnat.dg testsuite, lib/gcc-dg.exp is now calling
check_linker_plugin_available early, which ultimately calls
${tool}_target_compile.  For all languages but Ada,
${tool}_target_compile can compile .c files just fine, but
gnat_target_compile (which uses gnatmake) cannot, so it falls back to
directly calling gcc_target_compile in that case.  gcc_target_compile
relies on GCC_UNDER_TEST being set, which in this case hasn't yet
happened, thus the error.

My solution (a hack, actually) is to move the initialization of
GCC_UNDER_TEST in gcc-dg.exp before the calls to
check_linker_plugin_available.  x86_64-unknown-linux-gnu testing in
progress, will commit once that's finished.

Btw., the ChangeLog entry for Jan's patch was riddled with typos and
wrong pathnames.  I've corrected that with a separate checkin.

	Rainer


2011-10-21  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* lib/gcc-dg.exp (GCC_UNDER_TEST): Set before calling
	check_linker_plugin_available.