[gcc r14-9024] testsuite: Require lto-plugin support in gcc.dg/lto/modref-3 etc. [PR98237]

[gcc r14-9024] testsuite: Require lto-plugin support in gcc.dg/lto/modref-3 etc. [PR98237]

[Rainer Orth]

https://gcc.gnu.org/g:de658585d6dcc89f1cba71ef5f8f5b55719a7054

commit r14-9024-gde658585d6dcc89f1cba71ef5f8f5b55719a7054
Author: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Date:   Fri Feb 16 09:47:35 2024 +0100

    testsuite: Require lto-plugin support in gcc.dg/lto/modref-3 etc. [PR98237]
    
    gcc.dg/lto/modref-3 etc. FAIL on Solaris with the native linker:
    
    FAIL: gcc-dg-lto-modref-3-01.exe scan-wpa-ipa-dump modref "parm 1 flags: no_direct_clobber no_direct_escape"
    FAIL: gcc-dg-lto-modref-4-01.exe scan-wpa-ipa-dump modref "parm 1 flags: no_direct_clobber no_direct_escape"
    FAIL: gcc.dg/lto/modref-3 c_lto_modref-3_0.o-c_lto_modref-3_1.o execute -O2 -flto-partition=max -fdump-ipa-modref -fno-ipa-sra -fno-ipa-cp -flto
    FAIL: gcc.dg/lto/modref-4 c_lto_modref-4_0.o-c_lto_modref-4_1.o execute -O2 -flto-partition=max -fdump-ipa-modref -fno-ipa-sra -flto
    
    The issue is that the tests require the linker plugin, which isn't
    available with Solaris ld.  Thus, it also FAILs when gcc is configured
    with --disable-lto-plugin.
    
    This patch thus declares the requirement.  As it turns out, there's an
    undocumented dg-require-linker-plugin already, but I introduce and use
    the corresponding effective-target keyword and document both.
    
    Given that the effective-target form is more flexible, I'm tempted to
    remove dg-require-* with an empty arg as already mentioned in
    sourcebuild.texi.  That is not this patch, however.
    
    Tested on i386-pc-solaris2.11 with ld and gld.
    
    2024-02-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
    
            gcc/testsuite:
            PR ipa/98237
            * lib/target-supports.exp (is-effective-target): Handle
            linker_plugin.
            * gcc.dg/lto/modref-3_0.c: Require linker_plugin support.
            * gcc.dg/lto/modref-4_0.c: Likewise.
    
            gcc:
            * doc/sourcebuild.texi (Effective-Target Keywords, Other
            attribugs): Document linker_plugin.
            (Require Support): Document dg-require-linker-plugin.

Diff:
---
 gcc/doc/sourcebuild.texi              | 7 +++++++
 gcc/testsuite/gcc.dg/lto/modref-3_0.c | 1 +
 gcc/testsuite/gcc.dg/lto/modref-4_0.c | 1 +
 gcc/testsuite/lib/target-supports.exp | 1 +
 4 files changed, 10 insertions(+)

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index 193be19767fe..c431956a5933 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -3009,6 +3009,9 @@ Target supports @option{-mpe-aligned-commons}.
 @item pie
 Target supports @option{-pie}, @option{-fpie} and @option{-fPIE}.
 
+@item linker_plugin
+Target supports the linker plugin.
+
 @item rdynamic
 Target supports @option{-rdynamic}.
 
@@ -3337,6 +3340,10 @@ system.  Some tests are incompatible with DejaGnu's handling of remote
 hosts, which involves copying the source file to the host and compiling
 it with a relative path and "@code{-o a.out}".
 
+@item dg-require-linker-plugin ""
+Skip the test is the target does not support the linker plugin.
+This is equivalent to @code{dg-require-effective-target linker_plugin}.
+
 @item dg-require-mkfifo ""
 Skip the test if the target does not support @code{mkfifo}.
 
diff --git a/gcc/testsuite/gcc.dg/lto/modref-3_0.c b/gcc/testsuite/gcc.dg/lto/modref-3_0.c
index 0210d1151114..3f5354aaa48a 100644
--- a/gcc/testsuite/gcc.dg/lto/modref-3_0.c
+++ b/gcc/testsuite/gcc.dg/lto/modref-3_0.c
@@ -1,5 +1,6 @@
 /* { dg-lto-do run } */
 /* { dg-lto-options { {-O2 -flto-partition=max -fdump-ipa-modref -fno-ipa-sra -fno-ipa-cp -flto} } } */
+/* { dg-require-effective-target linker_plugin } */
 extern void copy (int *a, int *b);
 extern void barrier ();
 extern int *ptr;
diff --git a/gcc/testsuite/gcc.dg/lto/modref-4_0.c b/gcc/testsuite/gcc.dg/lto/modref-4_0.c
index 943758511462..3e837b66ce05 100644
--- a/gcc/testsuite/gcc.dg/lto/modref-4_0.c
+++ b/gcc/testsuite/gcc.dg/lto/modref-4_0.c
@@ -1,5 +1,6 @@
 /* { dg-lto-do run } */
 /* { dg-lto-options { {-O2 -flto-partition=max -fdump-ipa-modref -fno-ipa-sra -flto} } } */
+/* { dg-require-effective-target linker_plugin } */
 extern void copy (int *a, int *b);
 extern void barrier ();
 extern int *ptr;
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 645759496b7b..82c73faf7d89 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -9914,6 +9914,7 @@ proc is-effective-target { arg } {
 	  "htm_hw"         { set selected [check_htm_hw_available] }
 	  "named_sections" { set selected [check_named_sections_available] }
 	  "gc_sections"    { set selected [check_gc_sections_available] }
+	  "linker_plugin"  { set selected [check_linker_plugin_available] }
 	  "cxa_atexit"     { set selected [check_cxa_atexit_available] }
 	  default          { error "unknown effective target keyword `$arg'" }
 	}