[PATCH] tbb-backend effective target should check ability to link TBB

[Jonathan Wakely]

On 25/04/19 15:58 -0700, Thomas Rodgers wrote:
>
>	PR libstdc++/90252
>	* testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
>	Changed v3_target_compile check from preprocess to executable.
>---
> libstdc++-v3/testsuite/lib/libstdc++.exp | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)

This patch is still pending, but I think it's missing -ltbb that would
actually make the link succeed, isn't it?

>diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp b/libstdc++-v3/testsuite/lib/libstdc++.exp
>index c48b4d78bbb..fa61bccc9f6 100644
>--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
>+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
>@@ -1612,15 +1612,20 @@ proc check_effective_target_tbb-backend { } {
>     # Set up and preprocess a C++ test program that depends
>     # on tbb
>     set src tbb_backend[pid].cc
>-
>+    set exe tbb_backend[pid].x
>+
>     set f [open $src "w"]
>     puts $f "#include <tbb/tbb.h>"
>     puts $f "#if TBB_INTERFACE_VERSION < 10000"
>     puts $f "#  error Intel(R) Threading Building Blocks 2018 is required; older versions are not supported."
>     puts $f "#endif"
>+    puts $f "int main ()"
>+    puts $f "{"
>+    puts $f "  return 0;"
>+    puts $f "}"
>     close $f
>
>-    set lines [v3_target_compile $src /dev/null preprocess ""]
>+    set lines [v3_target_compile $src $exe executable ""]
>     file delete $src
>
>     if [string match "" $lines] {
>-- 
>2.20.1
>