7b6b15e010
The __llvm_prf_names section uses SHF_GNU_RETAIN. However, GNU ld before 2015-10 (https://sourceware.org/bugzilla/show_bug.cgi?id=19161) neither supports it nor retains __llvm_prf_names according to __start___llvm_prf_names. So --gc-sections does not work on such old GNU ld. This is not a problem for gold and sufficiently new lld.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/// Test instrumentation can handle various linkages.
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// REQUIRES: lld-available
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// RUN: %clang_profgen -fcoverage-mapping %s -o %t
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// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
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// RUN: llvm-profdata show %t.profraw --all-functions | FileCheck %s
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// RUN: %clang_profgen -fcoverage-mapping -ffunction-sections -fuse-ld=lld -Wl,--gc-sections %s -o %t
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// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
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// RUN: llvm-profdata show %t.profraw --all-functions | FileCheck %s
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// CHECK: {{.*}}external{{.*}}:
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// CHECK-NEXT: Hash:
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// CHECK-NEXT: Counters: 1
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// CHECK-NEXT: Function count: 1
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// CHECK: {{.*}}weak{{.*}}:
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// CHECK-NEXT: Hash:
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// CHECK-NEXT: Counters: 1
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// CHECK-NEXT: Function count: 1
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// CHECK: main:
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// CHECK-NEXT: Hash:
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// CHECK-NEXT: Counters: 1
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// CHECK-NEXT: Function count: 1
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// CHECK: {{.*}}internal{{.*}}:
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// CHECK-NEXT: Hash:
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// CHECK-NEXT: Counters: 1
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// CHECK-NEXT: Function count: 1
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// CHECK: {{.*}}linkonce_odr{{.*}}:
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// CHECK-NEXT: Hash:
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// CHECK-NEXT: Counters: 1
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// CHECK-NEXT: Function count: 1
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#include <stdio.h>
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void discarded0() {}
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__attribute__((weak)) void discarded1() {}
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void external() { puts("external"); }
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__attribute__((weak)) void weak() { puts("weak"); }
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static void internal() { puts("internal"); }
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__attribute__((noinline)) inline void linkonce_odr() { puts("linkonce_odr"); }
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int main() {
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internal();
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external();
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weak();
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linkonce_odr();
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}
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