rs6000/test: Fix empty TU in some cases of effective targets [PR106345]

As the failure of test case gcc.target/powerpc/pr92398.p9-.c in
PR106345 shows, some test sources for some powerpc effective
targets use empty translation unit wrongly.  The test sources
could go with options like "-ansi -pedantic-errors", then those
effective target checkings will fail unexpectedly with the
error messages like:

  error: ISO C forbids an empty translation unit [-Wpedantic]

This patch is to fix empty TUs with one dummy function definition
accordingly.

	PR testsuite/106345

gcc/testsuite/ChangeLog:

	* lib/target-supports.exp (check_effective_target_powerpc_sqrt): Add
	a function definition to avoid pedwarn about empty translation unit.
	(check_effective_target_has_arch_pwr5): Likewise.
	(check_effective_target_has_arch_pwr6): Likewise.
	(check_effective_target_has_arch_pwr7): Likewise.
	(check_effective_target_has_arch_pwr8): Likewise.
	(check_effective_target_has_arch_pwr9): Likewise.
	(check_effective_target_has_arch_pwr10): Likewise.
	(check_effective_target_has_arch_ppc64): Likewise.
	(check_effective_target_ppc_float128): Likewise.
	(check_effective_target_ppc_float128_insns): Likewise.
	(check_effective_target_powerpc_vsx): Likewise.

(cherry picked from commit 7a43e52a48b6403a99d3e8ab3105869b4b3c081e)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 244fe2306f457f46f860a1e919dbbddeea8d6757..3a4f65b9be695591aa82663c091ce840a08171da 100644 (file)
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -6240,9 +6240,12 @@ proc check_effective_target_powerpc_sqrt { } {
     }
 
     return [check_no_compiler_messages powerpc_sqrt object {
+       void test (void)
+       {
        #ifndef _ARCH_PPCSQ
        #error _ARCH_PPCSQ is not defined
        #endif
+       }
     } {}]
 }
 
@@ -6350,71 +6353,92 @@ proc check_effective_target_powerpc_p9modulo_ok { } {
 # as provided by the test.
 proc check_effective_target_has_arch_pwr5 { } {
        return [check_no_compiler_messages_nocache arch_pwr5 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PWR5
                #error does not have power5 support.
                #else
                /* "has power5 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
 proc check_effective_target_has_arch_pwr6 { } {
        return [check_no_compiler_messages_nocache arch_pwr6 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PWR6
                #error does not have power6 support.
                #else
                /* "has power6 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
 proc check_effective_target_has_arch_pwr7 { } {
        return [check_no_compiler_messages_nocache arch_pwr7 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PWR7
                #error does not have power7 support.
                #else
                /* "has power7 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
 proc check_effective_target_has_arch_pwr8 { } {
        return [check_no_compiler_messages_nocache arch_pwr8 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PWR8
                #error does not have power8 support.
                #else
                /* "has power8 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
 proc check_effective_target_has_arch_pwr9 { } {
        return [check_no_compiler_messages_nocache arch_pwr9 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PWR9
                #error does not have power9 support.
                #else
                /* "has power9 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
 proc check_effective_target_has_arch_pwr10 { } {
        return [check_no_compiler_messages_nocache arch_pwr10 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PWR10
                #error does not have power10 support.
                #else
                /* "has power10 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
 proc check_effective_target_has_arch_ppc64 { } {
        return [check_no_compiler_messages_nocache arch_ppc64 assembly {
+               void test (void)
+               {
                #ifndef _ARCH_PPC64
                #error does not have ppc64 support.
                #else
                /* "has ppc64 support" */
                #endif
+               }
        } [current_compiler_flags]]
 }
 
@@ -6501,9 +6525,12 @@ proc check_effective_target_powerpc_float128_hw_ok { } {
 
 proc check_effective_target_ppc_float128 { } {
     return [check_no_compiler_messages_nocache ppc_float128 object {
+       void test (void)
+       {
        #ifndef __FLOAT128__
          nope no good
        #endif
+       }
     }]
 }
 
@@ -6511,9 +6538,12 @@ proc check_effective_target_ppc_float128 { } {
 
 proc check_effective_target_ppc_float128_insns { } {
     return [check_no_compiler_messages_nocache ppc_float128 object {
+       void test (void)
+       {
        #ifndef __FLOAT128_HARDWARE__
          nope no good
        #endif
+       }
     }]
 }
 
@@ -6521,9 +6551,12 @@ proc check_effective_target_ppc_float128_insns { } {
 
 proc check_effective_target_powerpc_vsx { } {
     return [check_no_compiler_messages_nocache powerpc_vsx object {
+       void test (void)
+       {
        #ifndef __VSX__
          nope no vsx
        #endif
+       }
     }]
 }