| # Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| # This template defines a toolchain for something that works like gcc |
| # (including clang). |
| # |
| # It requires the following variables specifying the executables to run: |
| # - cc |
| # - cxx |
| # - ar |
| # - ld |
| # and the following which is used in the toolchain_args |
| # - toolchain_cpu (What "current_cpu" should be set to when invoking a |
| # build using this toolchain.) |
| # - toolchain_os (What "current_os" should be set to when invoking a |
| # build using this toolchain.) |
| # |
| # Optional parameters that control the tools: |
| # |
| # - libs_section_prefix |
| # - libs_section_postfix |
| # The contents of these strings, if specified, will be placed around |
| # the libs section of the linker line. It allows one to inject libraries |
| # at the beginning and end for all targets in a toolchain. |
| # - solink_libs_section_prefix |
| # - solink_libs_section_postfix |
| # Same as libs_section_{pre,post}fix except used for solink instead of link. |
| # - post_solink |
| # The content of this string, if specified, will be appended to the solink |
| # command. |
| # - deps |
| # Just forwarded to the toolchain definition. |
| # |
| # Optional build argument contols. |
| # |
| # - is_clang |
| # Whether to use clang instead of gcc. |
| # - is_component_build |
| # Whether to forcibly enable or disable component builds for this |
| # toolchain; if not specified, the toolchain will inherit the |
| # default setting. |
| # - use_gold |
| # Override the global use_gold setting, useful if the particular |
| # toolchain has a custom link step that is not actually using Gold. |
| template("gcc_toolchain") { |
| toolchain(target_name) { |
| assert(defined(invoker.cc), "gcc_toolchain() must specify a \"cc\" value") |
| assert(defined(invoker.cxx), "gcc_toolchain() must specify a \"cxx\" value") |
| assert(defined(invoker.ar), "gcc_toolchain() must specify a \"ar\" value") |
| assert(defined(invoker.ld), "gcc_toolchain() must specify a \"ld\" value") |
| assert(defined(invoker.toolchain_cpu), |
| "gcc_toolchain() must specify a \"toolchain_cpu\"") |
| assert(defined(invoker.toolchain_os), |
| "gcc_toolchain() must specify a \"toolchain_os\"") |
| |
| compiler_prefix = "" |
| |
| # This define changes when the toolchain changes, forcing a rebuild. |
| # Nothing should ever use this define. |
| if (defined(invoker.rebuild_define)) { |
| rebuild_string = "-D" + invoker.rebuild_define + " " |
| } else { |
| rebuild_string = "" |
| } |
| |
| # We can't do string interpolation ($ in strings) on things with dots in |
| # them. To allow us to use $cc below, for example, we create copies of |
| # these values in our scope. |
| cc = compiler_prefix + invoker.cc |
| cxx = compiler_prefix + invoker.cxx |
| ar = invoker.ar |
| ld = invoker.ld |
| if (defined(invoker.readelf)) { |
| readelf = invoker.readelf |
| } else { |
| readelf = "readelf" |
| } |
| if (defined(invoker.nm)) { |
| nm = invoker.nm |
| } else { |
| nm = "nm" |
| } |
| |
| if (defined(invoker.executable_extension)) { |
| default_executable_extension = invoker.executable_extension |
| } else { |
| default_executable_extension = "" |
| } |
| |
| # Bring these into our scope for string interpolation with default values. |
| if (defined(invoker.libs_section_prefix)) { |
| libs_section_prefix = invoker.libs_section_prefix |
| } else { |
| libs_section_prefix = "" |
| } |
| |
| if (defined(invoker.libs_section_postfix)) { |
| libs_section_postfix = invoker.libs_section_postfix |
| } else { |
| libs_section_postfix = "" |
| } |
| |
| if (defined(invoker.solink_libs_section_prefix)) { |
| solink_libs_section_prefix = invoker.solink_libs_section_prefix |
| } else { |
| solink_libs_section_prefix = "" |
| } |
| |
| if (defined(invoker.solink_libs_section_postfix)) { |
| solink_libs_section_postfix = invoker.solink_libs_section_postfix |
| } else { |
| solink_libs_section_postfix = "" |
| } |
| |
| # These library switches can apply to all tools below. |
| lib_switch = "-l" |
| lib_dir_switch = "-L" |
| |
| tool("cc") { |
| depfile = "{{output}}.d" |
| command = "$cc -g -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}" |
| depsformat = "gcc" |
| description = "CC {{output}}" |
| outputs = [ |
| "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o", |
| ] |
| } |
| |
| tool("cxx") { |
| depfile = "{{output}}.d" |
| command = "$cxx -g -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}" |
| depsformat = "gcc" |
| description = "CXX {{output}}" |
| outputs = [ |
| "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o", |
| ] |
| } |
| |
| tool("asm") { |
| # We can just use the C compiler to compile assembly. |
| command = "$cc ${rebuild_string}{{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}" |
| description = "ASM {{output}}" |
| outputs = [ |
| "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o", |
| ] |
| } |
| |
| tool("alink") { |
| rspfile = "{{output}}.rsp" |
| command = "rm -f {{output}} && $ar rcs {{output}} @$rspfile" |
| description = "AR {{output}}" |
| rspfile_content = "{{inputs}}" |
| outputs = [ |
| "{{target_out_dir}}/{{target_output_name}}{{output_extension}}", |
| ] |
| default_output_extension = ".a" |
| output_prefix = "lib" |
| } |
| |
| tool("solink") { |
| soname = "{{target_output_name}}{{output_extension}}" # e.g. "libfoo.so". |
| sofile = "{{root_out_dir}}/$soname" # Possibly including toolchain dir. |
| rspfile = sofile + ".rsp" |
| |
| # These variables are not built into GN but are helpers that implement |
| # (1) linking to produce a .so, (2) extracting the symbols from that file |
| # to a temporary file, (3) if the temporary file has differences from the |
| # existing .TOC file, overwrite it, otherwise, don't change it. |
| tocfile = sofile + ".TOC" |
| temporary_tocname = sofile + ".tmp" |
| link_command = |
| "$ld -shared {{ldflags}} -o $sofile -Wl,-soname=$soname @$rspfile" |
| toc_command = "{ $readelf -d $sofile | grep SONAME ; $nm -gD -f p $sofile | cut -f1-2 -d' '; } > $temporary_tocname" |
| replace_command = "if ! cmp -s $temporary_tocname $tocfile; then mv $temporary_tocname $tocfile; fi" |
| |
| command = "$link_command && $toc_command && $replace_command" |
| if (defined(invoker.postsolink)) { |
| command += " && " + invoker.postsolink |
| } |
| rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive $solink_libs_section_prefix {{libs}} $solink_libs_section_postfix" |
| |
| description = "SOLINK $sofile" |
| |
| # Use this for {{output_extension}} expansions unless a target manually |
| # overrides it (in which case {{output_extension}} will be what the target |
| # specifies). |
| default_output_extension = ".so" |
| |
| output_prefix = "lib" |
| |
| # Since the above commands only updates the .TOC file when it changes, ask |
| # Ninja to check if the timestamp actually changed to know if downstream |
| # dependencies should be recompiled. |
| restat = true |
| |
| # Tell GN about the output files. It will link to the sofile but use the |
| # tocfile for dependency management. |
| outputs = [ |
| sofile, |
| tocfile, |
| ] |
| if (defined(invoker.solink_outputs)) { |
| outputs += invoker.solink_outputs |
| } |
| link_output = sofile |
| depend_output = tocfile |
| } |
| |
| tool("link") { |
| outfile = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}" |
| rspfile = "$outfile.rsp" |
| command = "$ld {{ldflags}} -g -o $outfile -Wl,--start-group @$rspfile {{solibs}} -Wl,--end-group $libs_section_prefix {{libs}} $libs_section_postfix" |
| |
| default_output_extension = default_executable_extension |
| |
| if (defined(invoker.postlink)) { |
| command += " && " + invoker.postlink |
| } |
| description = "LINK $outfile" |
| rspfile_content = "{{inputs}}" |
| outputs = [ |
| outfile, |
| ] |
| if (defined(invoker.link_outputs)) { |
| outputs += invoker.link_outputs |
| } |
| } |
| |
| tool("stamp") { |
| command = "touch {{output}}" |
| description = "STAMP {{output}}" |
| } |
| |
| tool("copy") { |
| command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})" |
| description = "COPY {{source}} {{output}}" |
| } |
| |
| # When invoking this toolchain not as the default one, these args will be |
| # passed to the build. They are ignored when this is the default toolchain. |
| toolchain_args() { |
| current_cpu = invoker.toolchain_cpu |
| current_os = invoker.toolchain_os |
| |
| # These values need to be passed through unchanged. |
| target_os = target_os |
| target_cpu = target_cpu |
| |
| forward_variables_from(invoker, |
| [ |
| "is_clang", |
| "is_component_build", |
| "use_gold", |
| "symbol_level", |
| ]) |
| } |
| |
| forward_variables_from(invoker, [ "deps" ]) |
| } |
| } |
| |
| # This is a shorthand for gcc_toolchain instances based on the |
| # Chromium-built version of Clang. Only the toolchain_cpu and |
| # toolchain_os variables need to be specified by the invoker, and |
| # optionally toolprefix if it's a cross-compile case. Note that for |
| # a cross-compile case this toolchain requires a config to pass the |
| # appropriate -target option, or else it will actually just be doing |
| # a native compile. The invoker can optionally override use_gold too. |
| template("clang_toolchain") { |
| assert(defined(invoker.toolchain_cpu), |
| "clang_toolchain() must specify a \"toolchain_cpu\"") |
| assert(defined(invoker.toolchain_os), |
| "clang_toolchain() must specify a \"toolchain_os\"") |
| if (defined(invoker.toolprefix)) { |
| toolprefix = invoker.toolprefix |
| } else { |
| toolprefix = "" |
| } |
| |
| gcc_toolchain(target_name) { |
| prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin", |
| root_build_dir) |
| cc = "$prefix/clang" |
| cxx = "$prefix/clang++" |
| ld = cxx |
| is_clang = true |
| |
| readelf = "${toolprefix}readelf" |
| ar = "${toolprefix}ar" |
| nm = "${toolprefix}nm" |
| |
| forward_variables_from(invoker, |
| [ |
| "toolchain_cpu", |
| "toolchain_os", |
| "use_gold", |
| ]) |
| } |
| } |
