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Bug 1796046

Summary: clang fails mass rebuild on ppc64le
Product: [Fedora] Fedora Reporter: Mattias Ellert <mattias.ellert>
Component: clangAssignee: Tom Stellard <tstellar>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 32CC: airlied, sbergman, sguelton, siddharth.kde, tstellar
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-02-12 15:24:19 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1750908, 1792464    
Description Flags
The patch that makes the package build none

Description Mattias Ellert 2020-01-29 13:41:36 UTC
Created attachment 1656254 [details]
The patch that makes the package build

Description of problem:

clang fails mass rebuild on ppc64le:

build.log says:

../lib/Lex/Lexer.cpp: In member function 'bool clang::Lexer::SkipBlockComment(clang::Token&, const char*, bool&)':
../lib/Lex/Lexer.cpp:2545:34: error: ISO C++ forbids declaration of 'type name' with no type [-fpermissive]
 2545 |              !vec_any_eq(*(const vector unsigned char*)CurPtr, Slashes))
      |                                  ^~~~~~

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Rebuild clang for rawhide ppc64le (using gcc 10)

Actual results:

Failed build

Expected results:

Successful build

Additional info:

The following patch makes the build work:

$ cat clang-altivec-vector.patch 
diff -ur clang-9.0.1.src.orig/lib/Lex/Lexer.cpp clang-9.0.1.src/lib/Lex/Lexer.cpp
--- clang-9.0.1.src.orig/lib/Lex/Lexer.cpp	2019-12-11 20:15:30.000000000 +0100
+++ clang-9.0.1.src/lib/Lex/Lexer.cpp	2020-01-29 12:57:36.849173552 +0100
@@ -2542,7 +2542,7 @@
         '/', '/', '/', '/',  '/', '/', '/', '/'
       while (CurPtr+16 <= BufferEnd &&
-             !vec_any_eq(*(const vector unsigned char*)CurPtr, Slashes))
+             !vec_any_eq(*(const __vector unsigned char*)CurPtr, Slashes))
         CurPtr += 16;
       // Scan for '/' quickly.  Many block comments are very large.

Koji scratch build:

I.e. changing vector to __vector

I can not say if this in an intentional change in gcc 10 or an unintentinal regression.

Comment 1 Ben Cotton 2020-02-11 17:23:06 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 32 development cycle.
Changing version to 32.

Comment 2 serge_sans_paille 2020-02-12 15:24:19 UTC
This bug is due to a gcc upgrade and was fixed upstream in, included in clang-10.0.0-0.2.rc1.fc32