No libstdc++ for nvptx

No libstdc++ for nvptx

[Thomas Schwinge]

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Hi!

I committed the following in r221362:

commit 5121139d0e8b22290fc9e752b07752d8a1b70182
Author: tschwinge <tschwinge@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Mar 11 21:42:50 2015 +0000

    No libstdc++ for nvptx.
    
    The C++ front end insists to link against libstdc++ -- which we don't build:
    
        $ < build-gcc/gcc/testsuite/g++/g++.log grep -o 'error opening [^[:cntrl:]]*' | sort | uniq -c
              2 error opening libasan.a
              2 error opening libssp.a
          12075 error opening libstdc++.a
    
    Based on GCC trunk r220892:
    
                        === g++ Summary ===
    
        # of expected passes            [-63221-]{+68841+}
        # of unexpected failures        [-11751-]{+8764+}
        # of unexpected successes       6
        # of expected failures          [-246-]{+249+}
        # of unresolved testcases       [-5950-]{+3353+}
        # of unsupported tests          [-4160-]{+4143+}
    
    	gcc/
    	* config/nvptx/nvptx.h (LIBSTDCXX): Define to "gcc".
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@221362 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog            |    4 ++++
 gcc/config/nvptx/nvptx.h |    4 ++++
 2 files changed, 8 insertions(+)

diff --git gcc/ChangeLog gcc/ChangeLog
index 28979d5..e474fc8 100644
--- gcc/ChangeLog
+++ gcc/ChangeLog
@@ -1,3 +1,7 @@
+2015-03-11  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* config/nvptx/nvptx.h (LIBSTDCXX): Define to "gcc".
+
 2015-03-11  Marek Polacek  <polacek@redhat.com>
 
 	PR tree-optimization/65388
diff --git gcc/config/nvptx/nvptx.h gcc/config/nvptx/nvptx.h
index e74d16f..e4e58dd 100644
--- gcc/config/nvptx/nvptx.h
+++ gcc/config/nvptx/nvptx.h
@@ -366,4 +366,8 @@ struct GTY(()) machine_function
 #define FUNCTION_MODE QImode
 #define HAS_INIT_SECTION 1
 
+/* The C++ front end insists to link against libstdc++ -- which we don't build.
+   Tell it to instead link against the innocuous libgcc.  */
+#define LIBSTDCXX "gcc"
+
 #endif /* GCC_NVPTX_H */


Grüße,
 Thomas

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No libstdc++ for GCN (was: No libstdc++ for nvptx)

[Thomas Schwinge]

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Hi!

On 2015-03-11T22:44:27+0100, I wrote:
> I committed the following in r221362:

>     No libstdc++ for nvptx.
>
>     The C++ front end insists to link against libstdc++ -- which we don't build:
>
>         $ < build-gcc/gcc/testsuite/g++/g++.log grep -o 'error opening [^[:cntrl:]]*' | sort | uniq -c
>               2 error opening libasan.a
>               2 error opening libssp.a
>           12075 error opening libstdc++.a
>
>     Based on GCC trunk r220892:
>
>                         === g++ Summary ===
>
>         # of expected passes            [-63221-]{+68841+}
>         # of unexpected failures        [-11751-]{+8764+}
>         # of unexpected successes       6
>         # of expected failures          [-246-]{+249+}
>         # of unresolved testcases       [-5950-]{+3353+}
>         # of unsupported tests          [-4160-]{+4143+}

> --- gcc/config/nvptx/nvptx.h
> +++ gcc/config/nvptx/nvptx.h

> +/* The C++ front end insists to link against libstdc++ -- which we don't build.
> +   Tell it to instead link against the innocuous libgcc.  */
> +#define LIBSTDCXX "gcc"

Pushed to master branch commit 4d9d015cf4054f5f9df14a2c11ce81379b6caf0f
"No libstdc++ for GCN", see attached.

(Both these commit are going to get reverted once I've got libstdc++-v3
enabled for GCN, nvptx, but until then, this further harmonizes my GCN
vs. nvptx test results.)


Grüße
 Thomas


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From 4d9d015cf4054f5f9df14a2c11ce81379b6caf0f Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <thomas@codesourcery.com>
Date: Thu, 13 Apr 2023 08:54:47 +0200
Subject: [PATCH] No libstdc++ for GCN

Like commit d94fae044da071381b73a2ee8afa874b14fa3820 "No libstdc++ for nvptx"
(2015) and elsewhere.

Based on commit 5f1bed2a7af828103ca23a3546466a23e8dd2f30 (2023-12-16), there
are a ton of progressions (for test cases not actually depending on libstdc++
symbols, obviously):

                    === g++ Summary ===

    # of expected passes            [-178369-]{+189226+}
    # of unexpected failures        [-19880-]{+14089+}
    # of unexpected successes       14
    # of expected failures          [-1684-]{+1685+}
    # of unresolved testcases       [-9820-]{+4837+}
    # of unsupported tests          [-11971-]{+11968+}

..., and only two benign "regressions":

    [-UNSUPPORTED:-]{+FAIL:+} g++.dg/init/array54.C  -std=c++14 {+(test for excess errors)+}
    {+UNRESOLVED: g++.dg/init/array54.C  -std=c++14 compilation failed to produce executable+}
    [Etc.]

    [...]/g++.dg/init/array54.C:5:10: fatal error: atomic: No such file or directory

That's similar to a lof of other test cases intending to '#include' standard
C++/libstdc++ headers; to be addressed in due time.

    PASS: g++.old-deja/g++.pt/const2.C  -std=c++98  at line 5 (test for warnings, line )
    [-PASS:-]{+FAIL:+} g++.old-deja/g++.pt/const2.C  -std=c++98 (test for excess errors)
    [Etc.]

    ld: error: undefined symbol: A<int>::i
    >>> referenced by /tmp/ccqXWCSh.o:(p)

The 'error: undefined symbol' is expected here; maybe should simply in the test
case 'dg-prune-output "referenced by"'?  (This PASSed before, as the
'dg-message "i"' was satisfied by 'ld: error: unable to find library -lstdc++',
eh...)

	gcc/
	* config/gcn/gcn.h (LIBSTDCXX): Define to "gcc".
---
 gcc/config/gcn/gcn.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/config/gcn/gcn.h b/gcc/config/gcn/gcn.h
index cb52be7a3a1..b8f2854d497 100644
--- a/gcc/config/gcn/gcn.h
+++ b/gcc/config/gcn/gcn.h
@@ -836,3 +836,7 @@ enum gcn_builtin_codes
       || M == V2SFmode || M == V2DImode || M == V2DFmode) \
    ? 2 \
    : 1)
+
+/* The C++ front end insists to link against libstdc++ -- which we don't build.
+   Tell it to instead link against the innocuous libgcc.  */
+#define LIBSTDCXX "gcc"
-- 
2.34.1