Test for linking for arm/size-optimization-ieee-[123].c

These tests require a target that supports arm soft-float.  The
problem is that the test checks for compile-time soft-float support,
but they may hit a problem when the linker complains that it can't
combine the testcase's object file with hard-float init files and
target system libraries.

I don't see that the tests actually require linking, and they could be
simplified to dg-do assemble, but I figured a link test for soft-float
support could be useful, so I added that, and adjusted the tests to
require it instead.

Tested on an affected platform.  Ok to install?


for  gcc/testsuite/ChangeLog

	* lib/target-supports.exp
	(check_effective_target_arm_soft_ok_link): New.
	* gcc.target/arm/size-optimization-ieee-1.c: Use it.
	* gcc.target/arm/size-optimization-ieee-2.c: Likewise.
	* gcc.target/arm/size-optimization-ieee-3.c: Likewise.
---
 .../gcc.target/arm/size-optimization-ieee-1.c      |    2 +-
 .../gcc.target/arm/size-optimization-ieee-2.c      |    2 +-
 .../gcc.target/arm/size-optimization-ieee-3.c      |    2 +-
 gcc/testsuite/lib/target-supports.exp              |   12 ++++++++++++
 4 files changed, 15 insertions(+), 3 deletions(-)

Alexandre Oliva via Gcc-patches <gcc-patches@gcc.gnu.org> writes:
> These tests require a target that supports arm soft-float.  The
> problem is that the test checks for compile-time soft-float support,
> but they may hit a problem when the linker complains that it can't
> combine the testcase's object file with hard-float init files and
> target system libraries.
>
> I don't see that the tests actually require linking, and they could be
> simplified to dg-do assemble, but I figured a link test for soft-float
> support could be useful, so I added that, and adjusted the tests to
> require it instead.
>
> Tested on an affected platform.  Ok to install?
>
>
> for  gcc/testsuite/ChangeLog
>
> 	* lib/target-supports.exp
> 	(check_effective_target_arm_soft_ok_link): New.
> 	* gcc.target/arm/size-optimization-ieee-1.c: Use it.
> 	* gcc.target/arm/size-optimization-ieee-2.c: Likewise.
> 	* gcc.target/arm/size-optimization-ieee-3.c: Likewise.

OK, thanks.

Richard

> ---
>  .../gcc.target/arm/size-optimization-ieee-1.c      |    2 +-
>  .../gcc.target/arm/size-optimization-ieee-2.c      |    2 +-
>  .../gcc.target/arm/size-optimization-ieee-3.c      |    2 +-
>  gcc/testsuite/lib/target-supports.exp              |   12 ++++++++++++
>  4 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c
> index 61475eb4c679f..9af2c6e102071 100644
> --- a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c
> +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c
> @@ -1,4 +1,4 @@
> -/* { dg-do link { target arm_soft_ok } } */
> +/* { dg-do link { target arm_soft_ok_link } } */
>  /* { dg-skip-if "Feature is -mfloat-abi=soft only" { *-*-* } { "-mfloat-abi=*" } { "-mfloat-abi=soft" } } */
>  /* { dg-options "-mfloat-abi=soft" } */
>  
> diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c
> index b4699271ceacc..e78a7ada62eb7 100644
> --- a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c
> +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c
> @@ -1,4 +1,4 @@
> -/* { dg-do link { target arm_soft_ok } } */
> +/* { dg-do link { target arm_soft_ok_link } } */
>  /* { dg-skip-if "Feature is -mfloat-abi=soft only" { *-*-* } { "-mfloat-abi=*" } { "-mfloat-abi=soft" } } */
>  /* { dg-options "-mfloat-abi=soft" } */
>  
> diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c
> index 34b1ebe7afd60..bb9ccefda5e95 100644
> --- a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c
> +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c
> @@ -1,4 +1,4 @@
> -/* { dg-do link { target arm_soft_ok } } */
> +/* { dg-do link { target arm_soft_ok_link } } */
>  /* { dg-skip-if "Feature is -mfloat-abi=soft only" { *-*-* } { "-mfloat-abi=*" } { "-mfloat-abi=soft" } } */
>  /* { dg-options "-mfloat-abi=soft" } */
>  
> diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
> index a1aef0e0a1622..ff8edbd3e1776 100644
> --- a/gcc/testsuite/lib/target-supports.exp
> +++ b/gcc/testsuite/lib/target-supports.exp
> @@ -3935,6 +3935,18 @@ proc check_effective_target_arm_soft_ok { } {
>  	} "-mfloat-abi=soft"]
>  }
>  
> +# Return 1 if this is an ARM target supporting -mfloat-abi=soft even
> +# for linking.  Some multilibs may be incompatible with this option,
> +# and some linkers may reject incompatible options.
> +
> +proc check_effective_target_arm_soft_ok_link { } {
> +    return [check_no_compiler_messages arm_soft_ok_link executable {
> +	#include <stdint.h>
> +	int dummy;
> +	int main (void) { return 0; }
> +	} "-mfloat-abi=soft"]
> +}
> +
>  # Return 1 if this is an ARM target supporting -mfpu=vfp with an
>  # appropriate abi.