[PATCH v5 GCC] libffi/test: Fix compilation for build sysroot

[Jeff Law]

On Mon, 2020-04-20 at 14:18 +0100, Maciej W. Rozycki wrote:
> Fix a problem with the libffi testsuite using a method to determine the 
> compiler to use resulting in the tool being different from one the 
> library has been built with, and causing a catastrophic failure from the 
> inability to actually choose any compiler at all in a cross-compilation 
> configuration.
> 
> Address this problem by providing a DejaGNU configuration file defining 
> the compiler to use, via the CC_FOR_TARGET TCL variable, set from $CC by 
> autoconf, which will have all the required options set for the target 
> compiler to build executables in the environment configured, removing 
> failures like:
> 
> FAIL: libffi.call/closure_fn0.c -W -Wall -Wno-psabi -O0 (test for excess
> errors)
> Excess errors:
> default_target_compile: No compiler to compile with
> UNRESOLVED: libffi.call/closure_fn0.c -W -Wall -Wno-psabi -O0 compilation
> failed to produce executable
> 
> and bringing overall test results for the `riscv64-linux-gnu' target 
> (here with the `x86_64-linux-gnu' host and RISC-V QEMU in the Linux user 
> emulation mode as the target board) from:
> 
> 		=== libffi Summary ===
> 
> # of unexpected failures	708
> # of unresolved testcases	708
> # of unsupported tests		30
> 
> to:
> 
> 		=== libffi Summary ===
> 
> # of expected passes		1934
> # of unsupported tests		28
> 
> This is a combined backport of the relevant parts of upstream libffi 
> changes as follows:
> 
> - commit 8308984e479e ("[PATCH] Make sure we're running dejagnu tests 
>   with the right compiler."),
> 
> - commit 2d9b3939751b ("[PATCH] Fix for closures with sunpro compiler"),
> 
> - commit 0c3824702d3d ("[PATCH] Always set CC_FOR_TARGET for dejagnu, to
>   make the testsuite respect $CC"),
> 
> - commit 7d698125b1f0 ("[PATCH] Use the proper C++ compiler to run C++
>   tests"),
> 
> - commit 6b6df1a7bb37 ("[PATCH] Adds `local.exp` to CLEANFILES"),
> 
> - commit 6cf0dea78a5a ("[PATCH] Change CLEANFILES to DISTCLEANFILES")
> 
> 	libffi/
> 	* Makefile.am (DISTCLEANFILES): New variable.
> 	* configure.ac: Produce `local.exp'.
> 	* Makefile.in: Regenerate.
> 	* configure: Regenerate.
> 	* testsuite/Makefile.am (EXTRA_DEJAGNU_SITE_CONFIG): New 
> 	variable.
> 	* testsuite/Makefile.in: Regenerate.
OK
jeff
>