Commit a996a75e06193d377c3071042ece1c3af5cfdc6c | zig

author	Alex Rønne Petersen <alex@alexrp.com> 2025-12-12 20:25:34+01:00
committer	Alex Rønne Petersen <alex@alexrp.com> 2026-01-06 21:15:02+01:00
log	a996a75e06193d377c3071042ece1c3af5cfdc6c
tree	389c9eb5b65a4cd639e9d3ca6c0ac0eed6b927c6
parent	312b231da9a90e477c56801fb2056324edc50ea1
signature	Signed by SSH key SHA256:7B/LJ7bpR1eX8aCXSr4mtd5M45VMPKcx9zY8e95b5QM

compiler: make all Zig-provided libraries use -ffunction-sections -fdata-sections

We already did this for some of them; this just makes us consistent. Doing this
gives the linker more flexibility to rearrange code/data, but more importantly,
allows --gc-sections to get rid of all the unused code, which is a real concern
for these libraries in particular.

6 files changed, 13 insertions(+), 13 deletions(-)

src
- Compilation.zig
- libs

src/Compilation.zig+4-4

...	...	@@ -8084,8 +8084,8 @@ fn buildOutputFromZig(
8084	8084	}
8085	8085
8086	8086	pub const CrtFileOptions = struct {
8087		function_sections: ?bool = null,
8088		data_sections: ?bool = null,
	8087	function_sections: bool = true,
	8088	data_sections: bool = true,
8089	8089	omit_frame_pointer: ?bool = null,
8090	8090	unwind_tables: ?std.builtin.UnwindTables = null,
8091	8091	pic: ?bool = null,
...	...	@@ -8188,8 +8188,8 @@ pub fn build_crt_file(
8188	8188	.root_name = root_name,
8189	8189	.libc_installation = comp.libc_installation,
8190	8190	.emit_bin = .yes_cache,
8191		.function_sections = options.function_sections orelse false,
8192		.data_sections = options.data_sections orelse false,
	8191	.function_sections = options.function_sections,
	8192	.data_sections = options.data_sections,
8193	8193	.c_source_files = c_source_files,
8194	8194	.verbose_cc = comp.verbose_cc,
8195	8195	.verbose_link = comp.verbose_link,

src/libs/libcxx.zig+4

...	...	@@ -265,6 +265,8 @@ pub fn buildLibCxx(comp: *Compilation, prog_node: std.Progress.Node) BuildError!
265	265	.root_name = root_name,
266	266	.libc_installation = comp.libc_installation,
267	267	.emit_bin = .yes_cache,
	268	.function_sections = true,
	269	.data_sections = true,
268	270	.c_source_files = c_source_files.items,
269	271	.verbose_cc = comp.verbose_cc,
270	272	.verbose_link = comp.verbose_link,
...	...	@@ -459,6 +461,8 @@ pub fn buildLibCxxAbi(comp: *Compilation, prog_node: std.Progress.Node) BuildErr
459	461	.root_name = root_name,
460	462	.libc_installation = comp.libc_installation,
461	463	.emit_bin = .yes_cache,
	464	.function_sections = true,
	465	.data_sections = true,
462	466	.c_source_files = c_source_files.items,
463	467	.verbose_cc = comp.verbose_cc,
464	468	.verbose_link = comp.verbose_link,

src/libs/libtsan.zig+2

...	...	@@ -288,6 +288,8 @@ pub fn buildTsan(comp: *Compilation, prog_node: std.Progress.Node) BuildError!vo
288	288	.root_name = root_name,
289	289	.libc_installation = comp.libc_installation,
290	290	.emit_bin = .yes_cache,
	291	.function_sections = true,
	292	.data_sections = true,
291	293	.c_source_files = c_source_files.items,
292	294	.verbose_cc = comp.verbose_cc,
293	295	.verbose_link = comp.verbose_link,

src/libs/libunwind.zig+2-1

...	...	@@ -155,7 +155,8 @@ pub fn buildStaticLib(comp: *Compilation, prog_node: std.Progress.Node) BuildErr
155	155	.main_mod = null,
156	156	.libc_installation = comp.libc_installation,
157	157	.emit_bin = .yes_cache,
158		.function_sections = comp.function_sections,
	158	.function_sections = true,
	159	.data_sections = true,
159	160	.c_source_files = &c_source_files,
160	161	.verbose_cc = comp.verbose_cc,
161	162	.verbose_link = comp.verbose_link,

src/libs/mingw.zig+1

...	...	@@ -56,6 +56,7 @@ pub fn buildCrtFile(comp: *Compilation, crt_file: CrtFile, prog_node: std.Progre
56	56	},
57	57	};
58	58	return comp.build_crt_file("crt2", .Obj, .@"mingw-w64 crt2.o", prog_node, &files, .{
	59	.function_sections = false, // https://codeberg.org/ziglang/zig/issues/30702
59	60	.unwind_tables = unwind_tables,
60	61	});
61	62	},

src/libs/musl.zig-8

...	...	@@ -43,8 +43,6 @@ pub fn buildCrtFile(comp: *Compilation, in_crt_file: CrtFile, prog_node: std.Pro
43	43	},
44	44	};
45	45	return comp.build_crt_file("crt1", .Obj, .@"musl crt1.o", prog_node, &files, .{
46		.function_sections = true,
47		.data_sections = true,
48	46	.omit_frame_pointer = true,
49	47	.no_builtin = true,
50	48	});
...	...	@@ -63,8 +61,6 @@ pub fn buildCrtFile(comp: *Compilation, in_crt_file: CrtFile, prog_node: std.Pro
63	61	},
64	62	};
65	63	return comp.build_crt_file("rcrt1", .Obj, .@"musl rcrt1.o", prog_node, &files, .{
66		.function_sections = true,
67		.data_sections = true,
68	64	.omit_frame_pointer = true,
69	65	.pic = true,
70	66	.no_builtin = true,
...	...	@@ -84,8 +80,6 @@ pub fn buildCrtFile(comp: *Compilation, in_crt_file: CrtFile, prog_node: std.Pro
84	80	},
85	81	};
86	82	return comp.build_crt_file("Scrt1", .Obj, .@"musl Scrt1.o", prog_node, &files, .{
87		.function_sections = true,
88		.data_sections = true,
89	83	.omit_frame_pointer = true,
90	84	.pic = true,
91	85	.no_builtin = true,
...	...	@@ -172,8 +166,6 @@ pub fn buildCrtFile(comp: *Compilation, in_crt_file: CrtFile, prog_node: std.Pro
172	166	};
173	167	}
174	168	return comp.build_crt_file("c", .Lib, .@"musl libc.a", prog_node, c_source_files.items, .{
175		.function_sections = true,
176		.data_sections = true,
177	169	.omit_frame_pointer = true,
178	170	.no_builtin = true,
179	171	});