[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (…

…#98075)

This is a part of #97655.

libc/benchmarks/LibcDefaultImplementations.cpp

@@ -1,8 +1,9 @@
 #include "LibcFunctionPrototypes.h"
+#include "src/__support/macros/config.h"
 #include "llvm/ADT/ArrayRef.h"
 #include <cstddef>
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 extern void *memcpy(void *__restrict, const void *__restrict, size_t);
 extern void *memmove(void *, const void *, size_t);
@@ -11,7 +12,7 @@ extern void bzero(void *, size_t);
 extern int memcmp(const void *, const void *, size_t);
 extern int bcmp(const void *, const void *, size_t);
 
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 // List of implementations to test.
 

libc/benchmarks/LibcMemoryBenchmarkMain.cpp

@@ -10,6 +10,7 @@
 #include "LibcBenchmark.h"
 #include "LibcMemoryBenchmark.h"
 #include "MemorySizeDistributions.h"
+#include "src/__support/macros/config.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
@@ -21,7 +22,7 @@
 #include <cstring>
 #include <unistd.h>
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 extern void *memcpy(void *__restrict, const void *__restrict, size_t);
 extern void *memmove(void *, const void *, size_t);
@@ -30,7 +31,7 @@ extern void bzero(void *, size_t);
 extern int memcmp(const void *, const void *, size_t);
 extern int bcmp(const void *, const void *, size_t);
 
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 namespace llvm {
 namespace libc_benchmarks {

libc/benchmarks/automemcpy/lib/CodeGen.cpp

@@ -36,6 +36,7 @@
 // function at the end of the file.
 
 #include "automemcpy/CodeGen.h"
+#include "src/__support/macros/config.h"
 #include <cassert>
 #include <llvm/ADT/STLExtras.h>
 #include <llvm/ADT/StringSet.h>
@@ -542,11 +543,11 @@ static void Serialize(raw_ostream &Stream,
   Stream << "using llvm::libc_benchmarks::MemmoveConfiguration;\n";
   Stream << "using llvm::libc_benchmarks::MemsetConfiguration;\n";
   Stream << "\n";
-  Stream << "namespace LIBC_NAMESPACE {\n";
+  Stream << "namespace LIBC_NAMESPACE_DECL {\n";
   Stream << "\n";
   codegen::functions::Serialize(Stream, Descriptors);
   Stream << "\n";
-  Stream << "} // namespace LIBC_NAMESPACE\n";
+  Stream << "} // namespace LIBC_NAMESPACE_DECL\n";
   Stream << "\n";
   Stream << "namespace llvm {\n";
   Stream << "namespace automemcpy {\n";

libc/benchmarks/automemcpy/unittests/CodeGenTest.cpp

@@ -8,6 +8,7 @@
 
 #include "automemcpy/CodeGen.h"
 #include "automemcpy/RandomFunctionGenerator.h"
+#include "src/__support/macros/config.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include <optional>
@@ -63,7 +64,7 @@ using llvm::libc_benchmarks::MemcpyConfiguration;
 using llvm::libc_benchmarks::MemmoveConfiguration;
 using llvm::libc_benchmarks::MemsetConfiguration;
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 static void memcpy_0xE00E29EE73994E2B(char *__restrict dst, const char *__restrict src, size_t size) {
   using namespace LIBC_NAMESPACE::x86;
@@ -134,7 +135,7 @@ static void bzero_0x475977492C218AD4(char * dst, size_t size) {
   return splat_set<Align<_32,Arg::Dst>::Then<Loop<_32>>>(dst, 0, size);
 }
 
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 namespace llvm {
 namespace automemcpy {

libc/benchmarks/gpu/BenchmarkLogger.cpp

@@ -3,12 +3,13 @@
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/OSUtil/io.h"               // write_to_stderr
 #include "src/__support/big_int.h"                 // is_big_int
+#include "src/__support/macros/config.h"
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "src/__support/uint128.h"
 
 #include <stdint.h>
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 namespace benchmarks {
 
 // cpp::string_view specialization
@@ -94,4 +95,4 @@ template BenchmarkLogger &BenchmarkLogger::operator<< <UInt<320>>(UInt<320>);
 BenchmarkLogger log;
 
 } // namespace benchmarks
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL

libc/benchmarks/gpu/BenchmarkLogger.h

@@ -9,7 +9,9 @@
 #ifndef LLVM_LIBC_BENCHMARKS_GPU_BENCHMARKLOGGER_H
 #define LLVM_LIBC_BENCHMARKS_GPU_BENCHMARKLOGGER_H
 
-namespace LIBC_NAMESPACE {
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
 namespace benchmarks {
 
 // A class to log to standard output in the context of hermetic tests.
@@ -22,6 +24,6 @@ struct BenchmarkLogger {
 extern BenchmarkLogger log;
 
 } // namespace benchmarks
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif /* LLVM_LIBC_BENCHMARKS_GPU_BENCHMARKLOGGER_H */

libc/benchmarks/gpu/LibcGpuBenchmark.cpp

@@ -5,9 +5,10 @@
 #include "src/__support/FPUtil/sqrt.h"
 #include "src/__support/GPU/utils.h"
 #include "src/__support/fixedvector.h"
+#include "src/__support/macros/config.h"
 #include "src/time/gpu/time_utils.h"
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 namespace benchmarks {
 
 FixedVector<Benchmark *, 64> benchmarks;
@@ -135,4 +136,4 @@ BenchmarkResult benchmark(const BenchmarkOptions &options,
 };
 
 } // namespace benchmarks
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL

libc/benchmarks/gpu/LibcGpuBenchmark.h

@@ -6,11 +6,12 @@
 #include "src/__support/CPP/functional.h"
 #include "src/__support/CPP/limits.h"
 #include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
 #include "src/time/clock.h"
 
 #include <stdint.h>
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 namespace benchmarks {
 
@@ -99,7 +100,7 @@ class Benchmark {
   const cpp::string_view get_name() const { return name; }
 };
 } // namespace benchmarks
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #define BENCHMARK(SuiteName, TestName, Func)                                   \
   LIBC_NAMESPACE::benchmarks::Benchmark SuiteName##_##TestName##_Instance(     \

libc/benchmarks/gpu/timing/amdgpu/timing.h

@@ -25,7 +25,7 @@
   else                                                                         \
     asm("" ::"v"(VARIABLE))
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 // Returns the overhead associated with calling the profiling region. This
 // allows us to substract the constant-time overhead from the latency to
@@ -107,6 +107,6 @@ template <typename F, typename T1, typename T2>
   return stop - start;
 }
 
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_UTILS_GPU_TIMING_AMDGPU

libc/benchmarks/gpu/timing/nvptx/timing.h

@@ -16,7 +16,7 @@
 
 #include <stdint.h>
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 // Returns the overhead associated with calling the profiling region. This
 // allows us to substract the constant-time overhead from the latency to
@@ -94,6 +94,6 @@ static LIBC_INLINE uint64_t latency(F f, T1 t1, T2 t2) {
 
   return stop - start;
 }
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_UTILS_GPU_TIMING_NVPTX

libc/cmake/modules/LLVMLibCObjectRules.cmake

@@ -93,11 +93,11 @@ function(create_object_library fq_target_name)
     endif()
   endif()
 
-  if(fq_deps_list)
-    add_dependencies(${fq_target_name} ${fq_deps_list})
-    # Add deps as link libraries to inherit interface compile and link options.
-    target_link_libraries(${fq_target_name} PUBLIC ${fq_deps_list})
-  endif()
+  list(APPEND fq_deps_list libc.src.__support.macros.config)
+  list(REMOVE_DUPLICATES fq_deps_list)
+  add_dependencies(${fq_target_name} ${fq_deps_list})
+  # Add deps as link libraries to inherit interface compile and link options.
+  target_link_libraries(${fq_target_name} PUBLIC ${fq_deps_list})
 
   set_target_properties(
     ${fq_target_name}

libc/config/linux/app.h

@@ -9,11 +9,12 @@
 #ifndef LLVM_LIBC_CONFIG_LINUX_APP_H
 #define LLVM_LIBC_CONFIG_LINUX_APP_H
 
+#include "src/__support/macros/config.h"
 #include "src/__support/macros/properties/architectures.h"
 
 #include <stdint.h>
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 // Data structure to capture properties of the linux/ELF TLS image.
 struct TLSImage {
@@ -104,6 +105,6 @@ void cleanup_tls(uintptr_t tls_addr, uintptr_t tls_size);
 // Set the thread pointer for the current thread.
 bool set_thread_ptr(uintptr_t val);
 
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_CONFIG_LINUX_APP_H

libc/docs/dev/clang_tidy_checks.rst

@@ -36,17 +36,17 @@ implementation-in-namespace
 ---------------------------
 
 It is part of our implementation standards that all implementation pieces live
-under the ``LIBC_NAMESPACE`` namespace. This prevents pollution of the global
-namespace. Without a formal check to ensure this, an implementation might
-compile and pass unit tests, but not produce a usable libc function.
+under the ``LIBC_NAMESPACE_DECL`` namespace. This prevents pollution of the
+global namespace. Without a formal check to ensure this, an implementation
+might compile and pass unit tests, but not produce a usable libc function.
 
 This check that ensures any function call resolves to a function within the
-``LIBC_NAMESPACE`` namespace.
+``LIBC_NAMESPACE_DECL`` namespace.
 
 .. code-block:: c++
 
     // Correct: implementation inside the correct namespace.
-    namespace LIBC_NAMESPACE {
+    namespace LIBC_NAMESPACE_DECL {
         void LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {}
         // Namespaces within LIBC_NAMESPACE namespace are allowed.
         namespace inner{
@@ -87,7 +87,7 @@ are always external and can be intercepted.
 
 .. code-block:: c++
 
-    namespace LIBC_NAMESPACE {
+    namespace LIBC_NAMESPACE_DECL {
 
     // Allow calls with the fully qualified name.
     LIBC_NAMESPACE::strlen("hello");
@@ -104,4 +104,4 @@ are always external and can be intercepted.
     // Allow calling into specific global functions (explained above)
     ::malloc(10);
 
-    } // namespace LIBC_NAMESPACE
+    } // namespace LIBC_NAMESPACE_DECL

libc/fuzzing/__support/hashtable_fuzz.cpp

@@ -12,8 +12,9 @@
 #include "include/llvm-libc-types/ENTRY.h"
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/HashTable/table.h"
+#include "src/__support/macros/config.h"
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 
 // A fuzzing payload starts with
 // - uint16_t: initial capacity for table A
@@ -179,4 +180,4 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   return 0;
 }
 
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL

libc/src/__support/CPP/algorithm.h

@@ -13,8 +13,9 @@
 #define LLVM_LIBC_SRC___SUPPORT_CPP_ALGORITHM_H
 
 #include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 namespace cpp {
 
 template <class T> LIBC_INLINE constexpr const T &max(const T &a, const T &b) {
@@ -41,6 +42,6 @@ LIBC_INLINE constexpr bool all_of(InputIt first, InputIt last, UnaryPred p) {
 }
 
 } // namespace cpp
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_ALGORITHM_H

libc/src/__support/CPP/array.h

@@ -11,9 +11,10 @@
 
 #include "src/__support/CPP/iterator.h" // reverse_iterator
 #include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
 #include <stddef.h> // For size_t.
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 namespace cpp {
 
 template <class T, size_t N> struct array {
@@ -74,6 +75,6 @@ template <class T, size_t N> struct array {
 };
 
 } // namespace cpp
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H

libc/src/__support/CPP/atomic.h

@@ -10,11 +10,12 @@
 #define LLVM_LIBC_SRC___SUPPORT_CPP_ATOMIC_H
 
 #include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
 #include "src/__support/macros/properties/architectures.h"
 
 #include "type_traits.h"
 
-namespace LIBC_NAMESPACE {
+namespace LIBC_NAMESPACE_DECL {
 namespace cpp {
 
 enum class MemoryOrder : int {
@@ -211,6 +212,6 @@ LIBC_INLINE void atomic_signal_fence([[maybe_unused]] MemoryOrder mem_ord) {
 }
 
 } // namespace cpp
-} // namespace LIBC_NAMESPACE
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_ATOMIC_H

libc/src/__support/CPP/bit.h

@@ -14,11 +14,13 @@
 #include "src/__support/CPP/limits.h" // numeric_limits
 #include "src/__support/CPP/type_traits.h"
 #include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
 #include "src/__support/macros/sanitizer.h"
 
 #include <stdint.h>
 
-namespace LIBC_NAMESPACE::cpp {
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
 
 #if __has_builtin(__builtin_memcpy_inline)
 #define LLVM_LIBC_HAS_BUILTIN_MEMCPY_INLINE
@@ -290,6 +292,7 @@ ADD_SPECIALIZATION(unsigned long long, __builtin_popcountll)
 #endif // __builtin_popcountg
 #undef ADD_SPECIALIZATION
 
-} // namespace LIBC_NAMESPACE::cpp
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_SRC___SUPPORT_CPP_BIT_H