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Merge pull request #1679 from modocache/target-specific-glibc
[Glibc] Configure modulemap for target, not host
2 parents 2751bb9 + 04e1cd5 commit 5e24af7

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4 files changed

+91
-43
lines changed

4 files changed

+91
-43
lines changed

‎lib/ClangImporter/ClangImporter.cpp

Lines changed: 30 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -319,7 +319,7 @@ getNormalInvocationArguments(std::vector<std::string> &invocationArgStrs,
319319
// Enable modules.
320320
"-fmodules",
321321

322-
// Enable implicit module maps
322+
// Enable implicit module maps (this option is implied by "-fmodules").
323323
"-fimplicit-module-maps",
324324

325325
// Don't emit LLVM IR.
@@ -382,6 +382,35 @@ getNormalInvocationArguments(std::vector<std::string> &invocationArgStrs,
382382
// Just use the most feature-rich C language mode.
383383
"-x", "c", "-std=gnu11",
384384
});
385+
386+
// The module map used for Glibc depends on the target we're compiling for,
387+
// and is not included in the resource directory with the other implicit
388+
// module maps. It's at {freebsd|linux}/{arch}/glibc.modulemap.
389+
SmallString<128> GlibcModuleMapPath;
390+
if (!importerOpts.OverrideResourceDir.empty()) {
391+
GlibcModuleMapPath = importerOpts.OverrideResourceDir;
392+
} else if (!searchPathOpts.RuntimeResourcePath.empty()) {
393+
GlibcModuleMapPath = searchPathOpts.RuntimeResourcePath;
394+
}
395+
396+
// Running without a resource directory is not a supported configuration.
397+
assert(!GlibcModuleMapPath.empty());
398+
399+
llvm::sys::path::append(
400+
GlibcModuleMapPath,
401+
swift::getPlatformNameForTriple(triple), triple.getArchName(),
402+
"glibc.modulemap");
403+
404+
// Only specify the module map if that file actually exists.
405+
// It may not--for example in the case that
406+
// `swiftc -target x86_64-unknown-linux-gnu -emit-ir` is invoked using
407+
// a Swift compiler not built for Linux targets.
408+
if (llvm::sys::fs::exists(GlibcModuleMapPath)) {
409+
invocationArgStrs.push_back(
410+
(Twine("-fmodule-map-file=") + GlibcModuleMapPath).str());
411+
} else {
412+
// FIXME: Emit a warning of some kind.
413+
}
385414
}
386415

387416
if (triple.isOSDarwin()) {

‎stdlib/public/CMakeLists.txt

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -31,14 +31,11 @@ if(SWIFT_BUILD_STDLIB)
3131
add_subdirectory(stubs)
3232
add_subdirectory(core)
3333
add_subdirectory(SwiftOnoneSupport)
34+
add_subdirectory(Glibc)
3435
endif()
3536

3637
if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
3738
if(SWIFT_BUILD_SDK_OVERLAY)
3839
add_subdirectory(SDK)
3940
endif()
4041
endif()
41-
42-
if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
43-
add_subdirectory(Glibc)
44-
endif()

‎stdlib/public/Glibc/CMakeLists.txt

Lines changed: 48 additions & 36 deletions
Original file line numberDiff line numberDiff line change
@@ -3,44 +3,56 @@ set(sources
33
Misc.c
44
)
55

6-
set(output_dir "${SWIFTLIB_DIR}/glibc")
6+
# When cross-compiling the stdlib on Unix platforms, we'll need a separate
7+
# glibc for each target.
8+
foreach(SDK ${SWIFT_SDKS})
9+
foreach(arch ${SWIFT_SDK_${SDK}_ARCHITECTURES})
10+
set(output_dir "${SWIFTLIB_DIR}/${SWIFT_SDK_${SDK}_LIB_SUBDIR}/${arch}")
711

8-
# Set correct paths to glibc headers
9-
set(GLIBC_INCLUDE_PATH "/usr/include")
10-
if(CMAKE_LIBRARY_ARCHITECTURE)
11-
set(GLIBC_ARCH_INCLUDE_PATH "${GLIBC_INCLUDE_PATH}/${CMAKE_LIBRARY_ARCHITECTURE}")
12-
else()
13-
set(GLIBC_ARCH_INCLUDE_PATH "${GLIBC_INCLUDE_PATH}")
14-
endif()
15-
if (NOT EXISTS "${GLIBC_ARCH_INCLUDE_PATH}/sys")
16-
message(FATAL_ERROR "Glibc headers were not found.")
17-
endif()
12+
# Determine the location of glibc based on the target.
13+
set(GLIBC_INCLUDE_PATH "/usr/include")
14+
set(GLIBC_ARCH_INCLUDE_PATH "${GLIBC_INCLUDE_PATH}")
15+
if(("${SDK}" STREQUAL "LINUX" OR "${SDK}" STREQUAL "FREEBSD") AND CMAKE_LIBRARY_ARCHITECTURE)
16+
# FIXME: Some distributions install headers in
17+
# "/usr/include/x86_64-linux-gnu/sys/...". Here we use the host
18+
# machine's path, regardless of the SDK target we're building for.
19+
# This will break if cross-compiling from a distro that uses the
20+
# architecture as part of the path to a distro that does not.
21+
set(GLIBC_ARCH_INCLUDE_PATH "${GLIBC_INCLUDE_PATH}/${CMAKE_LIBRARY_ARCHITECTURE}")
22+
endif()
1823

19-
# Generate module.map
20-
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
21-
configure_file(module.map.in "${CMAKE_CURRENT_BINARY_DIR}/module.map" @ONLY)
22-
endif()
23-
if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
24-
configure_file(module.freebsd.map.in "${CMAKE_CURRENT_BINARY_DIR}/module.map" @ONLY)
25-
endif()
24+
# Configure the modulemap based on the target. Each platform needs to
25+
# reference different headers, based on what's available in their glibc.
26+
set(modulemap_path "${CMAKE_CURRENT_BINARY_DIR}/${SWIFT_SDK_${SDK}_LIB_SUBDIR}/${arch}/module.map")
27+
if("${SDK}" STREQUAL "FREEBSD")
28+
configure_file(module.freebsd.map.in "${modulemap_path}" @ONLY)
29+
else()
30+
configure_file(module.map.in "${modulemap_path}" @ONLY)
31+
endif()
2632

27-
add_custom_command_target(unused_var
28-
COMMAND
29-
"${CMAKE_COMMAND}" "-E" "make_directory" "${output_dir}"
30-
COMMAND
31-
"${CMAKE_COMMAND}" "-E" "copy_if_different"
32-
"${CMAKE_CURRENT_BINARY_DIR}/module.map"
33-
"${output_dir}/module.map"
34-
CUSTOM_TARGET_NAME "copy_glibc_module"
35-
OUTPUT "${output_dir}/module.map" "${output_dir}"
36-
DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/module.map"
37-
COMMENT "Copying Glibc module to ${output_dir}")
33+
set(VARIANT_SUFFIX "-${SWIFT_SDK_${SDK}_LIB_SUBDIR}-${arch}")
34+
add_custom_command_target(unused_var
35+
COMMAND
36+
"${CMAKE_COMMAND}" "-E" "make_directory" "${output_dir}"
37+
COMMAND
38+
"${CMAKE_COMMAND}" "-E" "copy_if_different"
39+
"${modulemap_path}"
40+
"${output_dir}/glibc.modulemap"
41+
CUSTOM_TARGET_NAME "copy_glibc_module${VARIANT_SUFFIX}"
42+
OUTPUT "${output_dir}/glibc.modulemap" "${output_dir}"
43+
DEPENDS "${modulemap_path}"
44+
COMMENT "Copying Glibc module to ${output_dir}")
3845

39-
swift_install_in_component(stdlib
40-
FILES "${output_dir}/module.map"
41-
DESTINATION "lib/swift/glibc")
46+
swift_install_in_component(stdlib
47+
FILES "${output_dir}/glibc.modulemap"
48+
DESTINATION "${output_dir}")
4249

43-
add_swift_library(swiftGlibc IS_SDK_OVERLAY
44-
${sources}
45-
FILE_DEPENDS copy_glibc_module "${output_dir}"
46-
INSTALL_IN_COMPONENT stdlib-experimental)
50+
if("${SDK}" STREQUAL "LINUX" OR "${SDK}" STREQUAL "${FREEBSD}")
51+
add_swift_library(swiftGlibc IS_SDK_OVERLAY
52+
${sources}
53+
FILE_DEPENDS "copy_glibc_module${VARIANT_SUFFIX}" "${output_dir}"
54+
TARGET_SDKS "${SDK}"
55+
INSTALL_IN_COMPONENT stdlib-experimental)
56+
endif()
57+
endforeach()
58+
endforeach()

‎tools/driver/modulewrap_main.cpp

Lines changed: 12 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -153,10 +153,20 @@ int modulewrap_main(ArrayRef<const char *> Args, const char *Argv0,
153153
return 1;
154154
}
155155

156-
// Wrap the bitstream in an object file.
156+
// Wrap the bitstream in a module object file. To use the ClangImporter to
157+
// create the module loader, we need to properly set the runtime library path.
158+
SearchPathOptions SearchPathOpts;
159+
// FIXME: This logic has been duplicated from
160+
// CompilerInvocation::setMainExecutablePath. ModuleWrapInvocation
161+
// should share its implementation.
162+
SmallString<128> RuntimeResourcePath(MainExecutablePath);
163+
llvm::sys::path::remove_filename(RuntimeResourcePath); // Remove /swift
164+
llvm::sys::path::remove_filename(RuntimeResourcePath); // Remove /bin
165+
llvm::sys::path::append(RuntimeResourcePath, "lib", "swift");
166+
SearchPathOpts.RuntimeResourcePath = RuntimeResourcePath.str();
167+
157168
SourceManager SrcMgr;
158169
LangOptions LangOpts;
159-
SearchPathOptions SearchPathOpts;
160170
LangOpts.Target = Invocation.getTargetTriple();
161171
ASTContext ASTCtx(LangOpts, SearchPathOpts, SrcMgr, Instance.getDiags());
162172
ClangImporterOptions ClangImporterOpts;

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