llvm-project/clang/test/InterfaceStubs/weak.cpp

// REQUIRES: x86-registered-target
// RUN: %clang -target x86_64-linux-gnu -o - -emit-interface-stubs -emit-merged-ifs \
// RUN: -interface-stub-version=experimental-ifs-v1 %s | \
// RUN: FileCheck %s

// RUN: %clang -target x86_64-unknown-linux-gnu -o - -c %s | llvm-nm - 2>&1 | \
// RUN: FileCheck -check-prefix=CHECK-SYMBOLS %s

// CHECK: Symbols:
// CHECK-DAG:  _Z8weakFuncv: { Type: Func, Weak: true }
// CHECK-DAG:  _Z10strongFuncv: { Type: Func }

// CHECK-SYMBOLS-DAG: _Z10strongFuncv
// CHECK-SYMBOLS-DAG: _Z8weakFuncv
__attribute__((weak)) void weakFunc() {}
int strongFunc() { return 42; }
[NFC] Fix for InterfaceStubs tests (adding REQUIRES: x86-registered-target). clang-hexagon-elf bot was failing with: 'No available targets are compatible with triple "x86_64-unknown-linux-gnu"' Adding a "// REQUIRES: x86-registered-target" to these tests to quiet the bot. llvm-svn: 363963 2019-06-20 18:28:21 +00:00			`// REQUIRES: x86-registered-target`
[clang][ifs] Clang Interface Stubs ToolChain plumbing. Second Landing Attempt: This patch enables end to end support for generating ELF interface stubs directly from clang. Now the following: clang -emit-interface-stubs -o libfoo.so a.cpp b.cpp c.cpp will product an ELF binary with visible symbols populated. Visibility attributes and -fvisibility can be used to control what gets populated. * Adding ToolChain support for clang Driver IFS Merge Phase * Implementing a default InterfaceStubs Merge clang Tool, used by ToolChain * Adds support for the clang Driver to involve llvm-ifs on ifs files. * Adds -emit-merged-ifs flag, to tell llvm-ifs to emit a merged ifs text file instead of the final object format (normally ELF) Differential Revision: https://reviews.llvm.org/D63978 llvm-svn: 374061 2019-10-08 15:23:14 +00:00			`// RUN: %clang -target x86_64-linux-gnu -o - -emit-interface-stubs -emit-merged-ifs \`
[clang][ifs] Dropping older experimental interface stub formats. I've been working on a new tool, llvm-ifs, for merging interface stub files generated by clang and I've iterated on my derivative format of TBE to a newer format. llvm-ifs will only support the new format, so I am going to drop the older experimental interface stubs formats in this commit to make things simpler. Differential Revision: https://reviews.llvm.org/D66573 llvm-svn: 369719 2019-08-22 23:44:34 +00:00			`// RUN: -interface-stub-version=experimental-ifs-v1 %s \| \`
[clang-ifs] Clang Interface Stubs, first version (second landing attempt). This change reverts r363649; effectively re-landing r363626. At this point clang::Index::CodegenNameGeneratorImpl has been refactored into clang::AST::ASTNameGenerator. This makes it so that the previous circular link dependency no longer exists, fixing the previous share lib (-DBUILD_SHARED_LIBS=ON) build issue which was the reason for r363649. Clang interface stubs (previously referred to as clang-ifsos) is a new frontend action in clang that allows the generation of stub files that contain mangled name info that can be used to produce a stub library. These stub libraries can be useful for breaking up build dependencies and controlling access to a library's internal symbols. Generation of these stubs can be invoked by: clang -fvisibility=<visibility> -emit-interface-stubs \ -interface-stub-version=<interface format> Notice that -fvisibility (along with use of visibility attributes) can be used to control what symbols get generated. Currently the interface format is experimental but there are a wide range of possibilities here. Currently clang-ifs produces .ifs files that can be thought of as analogous to object (.o) files, but just for the mangled symbol info. In a subsequent patch I intend to add support for merging the .ifs files into one .ifs/.ifso file that can be the input to something like llvm-elfabi to produce something like a .so file or .dll (but without any of the code, just symbols). Differential Revision: https://reviews.llvm.org/D60974 llvm-svn: 363948 2019-06-20 16:59:48 +00:00			`// RUN: FileCheck %s`

			`// RUN: %clang -target x86_64-unknown-linux-gnu -o - -c %s \| llvm-nm - 2>&1 \| \`
			`// RUN: FileCheck -check-prefix=CHECK-SYMBOLS %s`

			`// CHECK: Symbols:`
			`// CHECK-DAG: _Z8weakFuncv: { Type: Func, Weak: true }`
			`// CHECK-DAG: _Z10strongFuncv: { Type: Func }`

			`// CHECK-SYMBOLS-DAG: _Z10strongFuncv`
			`// CHECK-SYMBOLS-DAG: _Z8weakFuncv`
			`__attribute__((weak)) void weakFunc() {}`
			`int strongFunc() { return 42; }`