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Merge pull request #168 from aherrmann/sys-header-deps
feat: Enable libc/libc++ linking to expose system headers
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46 changes: 46 additions & 0 deletions
46
e2e/workspace/include-dependencies/zig-std-include/BUILD.bazel
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| load("@bazel_skylib//rules:build_test.bzl", "build_test") | ||
| load("@bazel_skylib//rules:diff_test.bzl", "diff_test") | ||
| load("@rules_zig//zig:defs.bzl", "zig_binary", "zig_library", "zig_test") | ||
|
|
||
| zig_binary( | ||
| name = "binary", | ||
| cdeps = ["@rules_zig//zig/lib:libc"], | ||
| main = "main.zig", | ||
| ) | ||
|
|
||
| zig_library( | ||
| name = "library", | ||
| cdeps = ["@rules_zig//zig/lib:libc"], | ||
| main = "main.zig", | ||
| ) | ||
|
|
||
| zig_test( | ||
| name = "test", | ||
| size = "small", | ||
| cdeps = ["@rules_zig//zig/lib:libc"], | ||
| main = "main.zig", | ||
| ) | ||
|
|
||
| build_test( | ||
| name = "build", | ||
| size = "small", | ||
| targets = [ | ||
| ":binary", | ||
| ":library", | ||
| ":test", | ||
| ], | ||
| ) | ||
|
|
||
| genrule( | ||
| name = "output", | ||
| outs = ["output.actual"], | ||
| cmd = "$(execpath :binary) > $(OUTS)", | ||
| tools = [":binary"], | ||
| ) | ||
|
|
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| diff_test( | ||
| name = "output_test", | ||
| size = "small", | ||
| file1 = ":output.expected", | ||
| file2 = ":output.actual", | ||
| ) |
16 changes: 16 additions & 0 deletions
16
e2e/workspace/include-dependencies/zig-std-include/main.zig
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| const std = @import("std"); | ||
| const c = @cImport({ | ||
| @cInclude("math.h"); | ||
| }); | ||
|
|
||
| pub fn main() !void { | ||
| const one = c.ceil(0.5); | ||
| const two = c.ceil(1.5); | ||
| try std.io.getStdOut().writer().print("{d}\n", .{one + two}); | ||
| } | ||
|
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| test "One plus two equals three" { | ||
| const one = c.ceil(0.5); | ||
| const two = c.ceil(1.5); | ||
| try std.testing.expectEqual(@as(f64, 3), one + two); | ||
| } |
1 change: 1 addition & 0 deletions
1
e2e/workspace/include-dependencies/zig-std-include/output.expected
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 3 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| """Helper targets to enable libc or libc++ linking. | ||
| The Zig compiler ships with various versions of libc and libc++. However, it | ||
| does not link against these libraries by default, and accordingly does not | ||
| expose standard library headers for C imports by default. To enable the import | ||
| of C standard library headers the compiler must be instructed to link against | ||
| libc or libc++ as appropriate. | ||
| The targets provided in this package can be used to accomplish this. Simply add | ||
| them to the `cdeps` attribute of your Zig target to enable libc or libc++ | ||
| linking. E.g. | ||
| ``` | ||
| zig_binary( | ||
| name = "binary", | ||
| main = "main.zig", | ||
| cdeps = ["@rules_zig//zig/lib:libc"], | ||
| ) | ||
| ``` | ||
| """ | ||
|
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| cc_library( | ||
| name = "libc", | ||
| linkopts = ["-lc"], | ||
| visibility = ["//visibility:public"], | ||
| ) | ||
|
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| cc_library( | ||
| name = "libc++", | ||
| linkopts = ["-lc++"], | ||
| visibility = ["//visibility:public"], | ||
| ) | ||
|
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| # Execute `bazel run //util:update_filegroups` to update this target. | ||
| filegroup( | ||
| name = "all_files", | ||
| srcs = [":BUILD.bazel"], | ||
| visibility = ["//zig:__pkg__"], | ||
| ) |
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