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build.zig: add support for using "zig c++" as the bootstrap c++ compiler

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The build was previously failing with `error: unknown command: -print-file-name=libstdc++.a`
because the command invocation was
`zig -print-file-name=libstdc++.a`
instead of
`zig c++ -print-file-name=libstdc++.a`

note: .cxx_compiler_arg1 = "" instead of undefined to avoid breaking existing setups without requiring to run cmake again.
This commit is contained in:
Xavier Bouchoux 2023-10-16 22:49:27 +02:00
parent 0afead5651
commit 69d6f2e1b8
2 changed files with 14 additions and 2 deletions
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15
build.zig
View File

@ -735,7 +735,11 @@ fn addCxxKnownPath(
) !void {
if (!std.process.can_spawn)
return error.RequiredLibraryNotFound;
const path_padded = b.exec(&.{ ctx.cxx_compiler, b.fmt("-print-file-name={s}", .{objname}) });
const path_padded = if (ctx.cxx_compiler_arg1.len > 0)
b.exec(&.{ ctx.cxx_compiler, ctx.cxx_compiler_arg1, b.fmt("-print-file-name={s}", .{objname}) })
else
b.exec(&.{ ctx.cxx_compiler, b.fmt("-print-file-name={s}", .{objname}) });
var tokenizer = mem.tokenizeAny(u8, path_padded, "\r\n");
const path_unpadded = tokenizer.next().?;
if (mem.eql(u8, path_unpadded, objname)) {
@ -778,6 +782,7 @@ const CMakeConfig = struct {
cmake_static_library_prefix: []const u8,
cmake_static_library_suffix: []const u8,
cxx_compiler: []const u8,
cxx_compiler_arg1: []const u8,
lld_include_dir: []const u8,
lld_libraries: []const u8,
clang_libraries: []const u8,
@ -844,6 +849,7 @@ fn parseConfigH(b: *std.Build, config_h_text: []const u8) ?CMakeConfig {
.cmake_static_library_prefix = undefined,
.cmake_static_library_suffix = undefined,
.cxx_compiler = undefined,
.cxx_compiler_arg1 = "",
.lld_include_dir = undefined,
.lld_libraries = undefined,
.clang_libraries = undefined,
@ -875,6 +881,10 @@ fn parseConfigH(b: *std.Build, config_h_text: []const u8) ?CMakeConfig {
.prefix = "#define ZIG_CXX_COMPILER ",
.field = "cxx_compiler",
},
.{
.prefix = "#define ZIG_CXX_COMPILER_ARG1 ",
.field = "cxx_compiler_arg1",
},
.{
.prefix = "#define ZIG_LLD_INCLUDE_PATH ",
.field = "lld_include_dir",
@ -917,7 +927,8 @@ fn parseConfigH(b: *std.Build, config_h_text: []const u8) ?CMakeConfig {
var it = mem.splitScalar(u8, line, '"');
_ = it.first(); // skip the stuff before the quote
const quoted = it.next().?; // the stuff inside the quote
@field(ctx, mapping.field) = toNativePathSep(b, quoted);
const trimmed = mem.trim(u8, quoted, " ");
@field(ctx, mapping.field) = toNativePathSep(b, trimmed);
}
}
if (mem.startsWith(u8, line, "#define ZIG_LLVM_LINK_MODE ")) {

1
stage1/config.h.in
View File

@ -21,6 +21,7 @@
#define ZIG_CMAKE_STATIC_LIBRARY_PREFIX "@CMAKE_STATIC_LIBRARY_PREFIX@"
#define ZIG_CMAKE_STATIC_LIBRARY_SUFFIX "@CMAKE_STATIC_LIBRARY_SUFFIX@"
#define ZIG_CXX_COMPILER "@CMAKE_CXX_COMPILER@"
#define ZIG_CXX_COMPILER_ARG1 "@CMAKE_CXX_COMPILER_ARG1@"
#define ZIG_DIA_GUIDS_LIB "@ZIG_DIA_GUIDS_LIB_ESCAPED@"
#define ZIG_LLD_INCLUDE_PATH "@LLD_INCLUDE_DIRS@"
#define ZIG_LLD_LIBRARIES "@LLD_LIBRARIES@"