[compiler-rt] r353547 - [InstrProf] Implement static profdata registration
Reid Kleckner via llvm-commits
llvm-commits at lists.llvm.org
Fri Feb 8 11:03:50 PST 2019
Author: rnk
Date: Fri Feb 8 11:03:50 2019
New Revision: 353547
URL: http://llvm.org/viewvc/llvm-project?rev=353547&view=rev
Log:
[InstrProf] Implement static profdata registration
Summary:
The motivating use case is eliminating duplicate profile data registered
for the same inline function in two object files. Before this change,
users would observe multiple symbol definition errors with VC link, but
links with LLD would succeed.
Users (Mozilla) have reported that PGO works well with clang-cl and LLD,
but when using LLD without this static registration, we would get into a
"relocation against a discarded section" situation. I'm not sure what
happens in that situation, but I suspect that duplicate, unused profile
information was retained. If so, this change will reduce the size of
such binaries with LLD.
Now, Windows uses static registration and is in line with all the other
platforms.
Reviewers: davidxl, wmi, inglorion, void, calixte
Subscribers: mgorny, krytarowski, eraman, fedor.sergeev, hiraditya, #sanitizers, dmajor, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D57929
Added:
compiler-rt/trunk/lib/profile/InstrProfilingPlatformWindows.c
compiler-rt/trunk/test/profile/coverage-inline.cpp
Modified:
compiler-rt/trunk/cmake/base-config-ix.cmake
compiler-rt/trunk/lib/profile/CMakeLists.txt
compiler-rt/trunk/lib/profile/InstrProfData.inc
compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c
compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c
compiler-rt/trunk/lib/profile/InstrProfilingValue.c
compiler-rt/trunk/test/profile/lit.cfg
Modified: compiler-rt/trunk/cmake/base-config-ix.cmake
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/cmake/base-config-ix.cmake?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/cmake/base-config-ix.cmake (original)
+++ compiler-rt/trunk/cmake/base-config-ix.cmake Fri Feb 8 11:03:50 2019
@@ -47,15 +47,11 @@ if (LLVM_TREE_AVAILABLE)
${LLVM_INCLUDE_TESTS})
option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered"
${LLVM_ENABLE_WERROR})
- # Use just-built Clang to compile/link tests on all platforms, except for
- # Windows where we need to use clang-cl instead.
- if(NOT MSVC)
- set(COMPILER_RT_TEST_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang)
- set(COMPILER_RT_TEST_CXX_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++)
- else()
- set(COMPILER_RT_TEST_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang.exe)
- set(COMPILER_RT_TEST_CXX_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++.exe)
- endif()
+ # Use just-built Clang to compile/link tests on all platforms.
+ set(COMPILER_RT_TEST_COMPILER
+ ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang${CMAKE_EXECUTABLE_SUFFIX})
+ set(COMPILER_RT_TEST_CXX_COMPILER
+ ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++${CMAKE_EXECUTABLE_SUFFIX})
else()
# Take output dir and install path from the user.
set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
Modified: compiler-rt/trunk/lib/profile/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/CMakeLists.txt?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/CMakeLists.txt (original)
+++ compiler-rt/trunk/lib/profile/CMakeLists.txt Fri Feb 8 11:03:50 2019
@@ -62,6 +62,7 @@ set(PROFILE_SOURCES
InstrProfilingPlatformFuchsia.c
InstrProfilingPlatformLinux.c
InstrProfilingPlatformOther.c
+ InstrProfilingPlatformWindows.c
InstrProfilingRuntime.cc
InstrProfilingUtil.c)
Modified: compiler-rt/trunk/lib/profile/InstrProfData.inc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfData.inc?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfData.inc (original)
+++ compiler-rt/trunk/lib/profile/InstrProfData.inc Fri Feb 8 11:03:50 2019
@@ -249,22 +249,22 @@ COVMAP_HEADER(uint32_t, Int32Ty, Version
#define INSTR_PROF_DATA_DEFINED
INSTR_PROF_SECT_ENTRY(IPSK_data, \
INSTR_PROF_QUOTE(INSTR_PROF_DATA_COMMON), \
- INSTR_PROF_QUOTE(INSTR_PROF_DATA_COFF), "__DATA,")
+ INSTR_PROF_DATA_COFF, "__DATA,")
INSTR_PROF_SECT_ENTRY(IPSK_cnts, \
INSTR_PROF_QUOTE(INSTR_PROF_CNTS_COMMON), \
- INSTR_PROF_QUOTE(INSTR_PROF_CNTS_COFF), "__DATA,")
+ INSTR_PROF_CNTS_COFF, "__DATA,")
INSTR_PROF_SECT_ENTRY(IPSK_name, \
INSTR_PROF_QUOTE(INSTR_PROF_NAME_COMMON), \
- INSTR_PROF_QUOTE(INSTR_PROF_NAME_COFF), "__DATA,")
+ INSTR_PROF_NAME_COFF, "__DATA,")
INSTR_PROF_SECT_ENTRY(IPSK_vals, \
INSTR_PROF_QUOTE(INSTR_PROF_VALS_COMMON), \
- INSTR_PROF_QUOTE(INSTR_PROF_VALS_COFF), "__DATA,")
+ INSTR_PROF_VALS_COFF, "__DATA,")
INSTR_PROF_SECT_ENTRY(IPSK_vnodes, \
INSTR_PROF_QUOTE(INSTR_PROF_VNODES_COMMON), \
- INSTR_PROF_QUOTE(INSTR_PROF_VNODES_COFF), "__DATA,")
+ INSTR_PROF_VNODES_COFF, "__DATA,")
INSTR_PROF_SECT_ENTRY(IPSK_covmap, \
INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_COMMON), \
- INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_COFF), "__LLVM_COV,")
+ INSTR_PROF_COVMAP_COFF, "__LLVM_COV,")
#undef INSTR_PROF_SECT_ENTRY
#endif
@@ -654,13 +654,15 @@ serializeValueProfDataFrom(ValueProfReco
#define INSTR_PROF_VALS_COMMON __llvm_prf_vals
#define INSTR_PROF_VNODES_COMMON __llvm_prf_vnds
#define INSTR_PROF_COVMAP_COMMON __llvm_covmap
-/* Win32 */
-#define INSTR_PROF_DATA_COFF .lprfd
-#define INSTR_PROF_NAME_COFF .lprfn
-#define INSTR_PROF_CNTS_COFF .lprfc
-#define INSTR_PROF_VALS_COFF .lprfv
-#define INSTR_PROF_VNODES_COFF .lprfnd
-#define INSTR_PROF_COVMAP_COFF .lcovmap
+/* Windows section names. Because these section names contain dollar characters,
+ * they must be quoted.
+ */
+#define INSTR_PROF_DATA_COFF ".lprfd$M"
+#define INSTR_PROF_NAME_COFF ".lprfn$M"
+#define INSTR_PROF_CNTS_COFF ".lprfc$M"
+#define INSTR_PROF_VALS_COFF ".lprfv$M"
+#define INSTR_PROF_VNODES_COFF ".lprfnd$M"
+#define INSTR_PROF_COVMAP_COFF ".lcovmap$M"
#ifdef _WIN32
/* Runtime section names and name strings. */
@@ -676,31 +678,18 @@ serializeValueProfDataFrom(ValueProfReco
#define INSTR_PROF_COVMAP_SECT_NAME INSTR_PROF_COVMAP_COFF
#else
/* Runtime section names and name strings. */
-#define INSTR_PROF_DATA_SECT_NAME INSTR_PROF_DATA_COMMON
-#define INSTR_PROF_NAME_SECT_NAME INSTR_PROF_NAME_COMMON
-#define INSTR_PROF_CNTS_SECT_NAME INSTR_PROF_CNTS_COMMON
+#define INSTR_PROF_DATA_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_DATA_COMMON)
+#define INSTR_PROF_NAME_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_NAME_COMMON)
+#define INSTR_PROF_CNTS_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_CNTS_COMMON)
/* Array of pointers. Each pointer points to a list
* of value nodes associated with one value site.
*/
-#define INSTR_PROF_VALS_SECT_NAME INSTR_PROF_VALS_COMMON
+#define INSTR_PROF_VALS_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_VALS_COMMON)
/* Value profile nodes section. */
-#define INSTR_PROF_VNODES_SECT_NAME INSTR_PROF_VNODES_COMMON
-#define INSTR_PROF_COVMAP_SECT_NAME INSTR_PROF_COVMAP_COMMON
+#define INSTR_PROF_VNODES_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_VNODES_COMMON)
+#define INSTR_PROF_COVMAP_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_COMMON)
#endif
-#define INSTR_PROF_DATA_SECT_NAME_STR \
- INSTR_PROF_QUOTE(INSTR_PROF_DATA_SECT_NAME)
-#define INSTR_PROF_NAME_SECT_NAME_STR \
- INSTR_PROF_QUOTE(INSTR_PROF_NAME_SECT_NAME)
-#define INSTR_PROF_CNTS_SECT_NAME_STR \
- INSTR_PROF_QUOTE(INSTR_PROF_CNTS_SECT_NAME)
-#define INSTR_PROF_COVMAP_SECT_NAME_STR \
- INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_SECT_NAME)
-#define INSTR_PROF_VALS_SECT_NAME_STR \
- INSTR_PROF_QUOTE(INSTR_PROF_VALS_SECT_NAME)
-#define INSTR_PROF_VNODES_SECT_NAME_STR \
- INSTR_PROF_QUOTE(INSTR_PROF_VNODES_SECT_NAME)
-
/* Macros to define start/stop section symbol for a given
* section on Linux. For instance
* INSTR_PROF_SECT_START(INSTR_PROF_DATA_SECT_NAME) will
Modified: compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c (original)
+++ compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c Fri Feb 8 11:03:50 2019
@@ -13,14 +13,14 @@
#include "InstrProfiling.h"
-#define PROF_DATA_START INSTR_PROF_SECT_START(INSTR_PROF_DATA_SECT_NAME)
-#define PROF_DATA_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_DATA_SECT_NAME)
-#define PROF_NAME_START INSTR_PROF_SECT_START(INSTR_PROF_NAME_SECT_NAME)
-#define PROF_NAME_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_NAME_SECT_NAME)
-#define PROF_CNTS_START INSTR_PROF_SECT_START(INSTR_PROF_CNTS_SECT_NAME)
-#define PROF_CNTS_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_CNTS_SECT_NAME)
-#define PROF_VNODES_START INSTR_PROF_SECT_START(INSTR_PROF_VNODES_SECT_NAME)
-#define PROF_VNODES_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_VNODES_SECT_NAME)
+#define PROF_DATA_START INSTR_PROF_SECT_START(INSTR_PROF_DATA_COMMON)
+#define PROF_DATA_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_DATA_COMMON)
+#define PROF_NAME_START INSTR_PROF_SECT_START(INSTR_PROF_NAME_COMMON)
+#define PROF_NAME_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_NAME_COMMON)
+#define PROF_CNTS_START INSTR_PROF_SECT_START(INSTR_PROF_CNTS_COMMON)
+#define PROF_CNTS_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_CNTS_COMMON)
+#define PROF_VNODES_START INSTR_PROF_SECT_START(INSTR_PROF_VNODES_COMMON)
+#define PROF_VNODES_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_VNODES_COMMON)
/* Declare section start and stop symbols for various sections
* generated by compiler instrumentation.
@@ -36,11 +36,11 @@ extern ValueProfNode PROF_VNODES_STOP CO
/* Add dummy data to ensure the section is always created. */
__llvm_profile_data
- __prof_data_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_DATA_SECT_NAME_STR);
+ __prof_data_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_DATA_SECT_NAME);
uint64_t
- __prof_cnts_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_CNTS_SECT_NAME_STR);
-char __prof_nms_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_NAME_SECT_NAME_STR);
-ValueProfNode __prof_vnodes_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_VNODES_SECT_NAME_STR);
+ __prof_cnts_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_CNTS_SECT_NAME);
+char __prof_nms_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_NAME_SECT_NAME);
+ValueProfNode __prof_vnodes_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_VNODES_SECT_NAME);
COMPILER_RT_VISIBILITY const __llvm_profile_data *
__llvm_profile_begin_data(void) {
Modified: compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c (original)
+++ compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c Fri Feb 8 11:03:50 2019
@@ -6,10 +6,12 @@
|*
\*===----------------------------------------------------------------------===*/
-#if !defined(__APPLE__) && !defined(__linux__) && !defined(__FreeBSD__) && \
- !(defined(__sun__) && defined(__svr4__)) && !defined(__NetBSD__)
+#if !defined(__APPLE__) && !defined(__linux__) && !defined(__FreeBSD__) && \
+ !(defined(__sun__) && defined(__svr4__)) && !defined(__NetBSD__) && \
+ !defined(_WIN32)
#include <stdlib.h>
+#include <stdio.h>
#include "InstrProfiling.h"
@@ -91,13 +93,4 @@ ValueProfNode *__llvm_profile_end_vnodes
COMPILER_RT_VISIBILITY ValueProfNode *CurrentVNode = 0;
COMPILER_RT_VISIBILITY ValueProfNode *EndVNode = 0;
-#if defined(_WIN32)
-// Put read-write sections in .data.
-#pragma comment(linker, "/MERGE:.lprfc=.data")
-#pragma comment(linker, "/MERGE:.lprfd=.data")
-// Put read-write sections in .rdata.
-#pragma comment(linker, "/MERGE:.lcovmap=.rdata")
-#pragma comment(linker, "/MERGE:.lprfn=.rdata")
-#endif
-
#endif
Added: compiler-rt/trunk/lib/profile/InstrProfilingPlatformWindows.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfilingPlatformWindows.c?rev=353547&view=auto
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfilingPlatformWindows.c (added)
+++ compiler-rt/trunk/lib/profile/InstrProfilingPlatformWindows.c Fri Feb 8 11:03:50 2019
@@ -0,0 +1,65 @@
+/*===- InstrProfilingPlatformWindows.c - Profile data on Windows ----------===*\
+|*
+|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+|* See https://llvm.org/LICENSE.txt for license information.
+|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+|*
+\*===----------------------------------------------------------------------===*/
+
+#include "InstrProfiling.h"
+
+#if defined(_WIN32)
+
+#if defined(_MSC_VER)
+/* Merge read-write sections into .data. */
+#pragma comment(linker, "/MERGE:.lprfc=.data")
+#pragma comment(linker, "/MERGE:.lprfd=.data")
+#pragma comment(linker, "/MERGE:.lprfv=.data")
+#pragma comment(linker, "/MERGE:.lprfnd=.data")
+/* Merge read-only sections into .rdata. */
+#pragma comment(linker, "/MERGE:.lprfn=.rdata")
+#pragma comment(linker, "/MERGE:.lcovmap=.rdata")
+
+/* Allocate read-only section bounds. */
+#pragma section(".lprfn$A", read)
+#pragma section(".lprfn$Z", read)
+
+/* Allocate read-write section bounds. */
+#pragma section(".lprfd$A", read, write)
+#pragma section(".lprfd$Z", read, write)
+#pragma section(".lprfc$A", read, write)
+#pragma section(".lprfc$Z", read, write)
+#pragma section(".lprfnd$A", read, write)
+#pragma section(".lprfnd$Z", read, write)
+#endif
+
+__llvm_profile_data COMPILER_RT_SECTION(".lprfd$A") DataStart = {0};
+__llvm_profile_data COMPILER_RT_SECTION(".lprfd$Z") DataEnd = {0};
+
+const char COMPILER_RT_SECTION(".lprfn$A") NamesStart = '\0';
+const char COMPILER_RT_SECTION(".lprfn$Z") NamesEnd = '\0';
+
+uint64_t COMPILER_RT_SECTION(".lprfc$A") CountersStart;
+uint64_t COMPILER_RT_SECTION(".lprfc$Z") CountersEnd;
+
+ValueProfNode COMPILER_RT_SECTION(".lprfnd$A") VNodesStart;
+ValueProfNode COMPILER_RT_SECTION(".lprfnd$Z") VNodesEnd;
+
+const __llvm_profile_data *__llvm_profile_begin_data(void) {
+ return &DataStart + 1;
+}
+const __llvm_profile_data *__llvm_profile_end_data(void) { return &DataEnd; }
+
+const char *__llvm_profile_begin_names(void) { return &NamesStart + 1; }
+const char *__llvm_profile_end_names(void) { return &NamesEnd; }
+
+uint64_t *__llvm_profile_begin_counters(void) { return &CountersStart + 1; }
+uint64_t *__llvm_profile_end_counters(void) { return &CountersEnd; }
+
+ValueProfNode *__llvm_profile_begin_vnodes(void) { return &VNodesStart + 1; }
+ValueProfNode *__llvm_profile_end_vnodes(void) { return &VNodesEnd; }
+
+ValueProfNode *CurrentVNode = &VNodesStart + 1;
+ValueProfNode *EndVNode = &VNodesEnd;
+
+#endif
Modified: compiler-rt/trunk/lib/profile/InstrProfilingValue.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfilingValue.c?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfilingValue.c (original)
+++ compiler-rt/trunk/lib/profile/InstrProfilingValue.c Fri Feb 8 11:03:50 2019
@@ -31,7 +31,7 @@ static int hasNonDefaultValsPerSite = 0;
* allocated by the compiler. */
COMPILER_RT_VISIBILITY ValueProfNode
lprofValueProfNodes[INSTR_PROF_VNODE_POOL_SIZE] COMPILER_RT_SECTION(
- COMPILER_RT_SEG INSTR_PROF_VNODES_SECT_NAME_STR);
+ COMPILER_RT_SEG INSTR_PROF_VNODES_SECT_NAME);
#endif
COMPILER_RT_VISIBILITY uint32_t VPMaxNumValsPerSite =
Added: compiler-rt/trunk/test/profile/coverage-inline.cpp
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/profile/coverage-inline.cpp?rev=353547&view=auto
==============================================================================
--- compiler-rt/trunk/test/profile/coverage-inline.cpp (added)
+++ compiler-rt/trunk/test/profile/coverage-inline.cpp Fri Feb 8 11:03:50 2019
@@ -0,0 +1,40 @@
+// RUN: %clang_profgen -g -fcoverage-mapping -c -o %t1.o %s -DOBJECT_1
+// RUN: %clang_profgen -g -fcoverage-mapping -c -o %t2.o %s
+// RUN: %clang_profgen -g -fcoverage-mapping %t1.o %t2.o -o %t.exe
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t.exe
+// RUN: llvm-profdata show %t.profraw -all-functions | FileCheck %s
+
+// Test that the instrumentation puts the right linkage on the profile data for
+// inline functions.
+
+// CHECK: {{.*}}foo{{.*}}:
+// CHECK-NEXT: Hash:
+// CHECK-NEXT: Counters: 1
+// CHECK-NEXT: Function count: 1
+// CHECK: {{.*}}inline_wrapper{{.*}}:
+// CHECK-NEXT: Hash:
+// CHECK-NEXT: Counters: 1
+// CHECK-NEXT: Function count: 2
+// CHECK: main:
+// CHECK-NEXT: Hash:
+// CHECK-NEXT: Counters: 1
+// CHECK-NEXT: Function count: 1
+
+extern "C" int puts(const char *);
+
+inline void inline_wrapper(const char *msg) {
+ puts(msg);
+}
+
+void foo();
+
+#ifdef OBJECT_1
+void foo() {
+ inline_wrapper("foo");
+}
+#else
+int main() {
+ inline_wrapper("main");
+ foo();
+}
+#endif
Modified: compiler-rt/trunk/test/profile/lit.cfg
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/profile/lit.cfg?rev=353547&r1=353546&r2=353547&view=diff
==============================================================================
--- compiler-rt/trunk/test/profile/lit.cfg (original)
+++ compiler-rt/trunk/test/profile/lit.cfg Fri Feb 8 11:03:50 2019
@@ -24,6 +24,10 @@ if hasattr(config, 'profile_lit_binary_d
if config.host_os in ['Linux']:
extra_link_flags = ["-ldl"]
+elif config.host_os in ['Windows']:
+ # InstrProf is incompatible with incremental linking. Disable it as a
+ # workaround.
+ extra_link_flags = ["-Wl,-incremental:no"]
else:
extra_link_flags = []
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