[CodeGenModule] Assume dso_local for -fpic -fno-semantic-interposition
Summary:
Clang -fpic defaults to -fno-semantic-interposition (GCC -fpic defaults
to -fsemantic-interposition).
Users need to specify -fsemantic-interposition to get semantic
interposition behavior.
Semantic interposition is currently a best-effort feature. There may
still be some cases where it is not handled well.
Reviewers: peter.smith, rnk, serge-sans-paille, sfertile, jfb, jdoerfert
Subscribers: dschuff, jyknight, dylanmckay, nemanjai, jvesely, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, sabuasal, niosHD, jrtc27, zzheng, edward-jones, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, arphaman, PkmX, jocewei, jsji, Jim, lenary, s.egerton, pzheng, sameer.abuasal, apazos, luismarques, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D73865
2020-02-03 04:23:47 +08:00
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// RUN: %clang_cc1 %s -I%S -fvisibility hidden -triple x86_64-linux-gnu -emit-llvm -o - -fsemantic-interposition | FileCheck %s
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2015-01-15 16:41:25 +08:00
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#include <stdarg.h>
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#include <typeinfo>
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// If struct __va_list_tag did not explicitly have default visibility, then
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// under -fvisibility hidden the type of function f, due to its va_list (aka
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// __builtin_va_list, aka __va_list_tag (*)[1]) parameter would be hidden:
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// CHECK: @_ZTSFvP13__va_list_tagE = linkonce_odr constant
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// CHECK: @_ZTIFvP13__va_list_tagE = linkonce_odr constant
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void f(va_list) { (void)typeid(f); }
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