Commit cbaaf6477fa314257a550515886563d6e7a06fc7 | zig

author	Pat Tullmann <pat.github@tullmann.org> 2023-11-28 20:26:17-08:00
committer	Andrew Kelley <andrew@ziglang.org> 2024-01-04 17:12:07-07:00
log	cbaaf6477fa314257a550515886563d6e7a06fc7
tree	30b76ec92695a6018f69c65cc7b5912d19432739
parent	4a5d73a34d6473a6970d6aaa31703cfa43135729

test glibc_runtime_check: add strlcpy() check

The strlcpy symbol was added in v2.38, so this is a handy symbol for
creating binaries that won't run on relatively modern systems (e.g., mine,
that has glibc 2.36 installed).

2 files changed, 29 insertions(+), 1 deletions(-)

test
- link
  - glibc_compat
    build.zig
    glibc_runtime_check.zig

test/link/glibc_compat/build.zig+7-1

...	...	@@ -90,9 +90,15 @@ pub fn build(b: *std.Build) void {
90	90	} else {
91	91	check.checkInDynamicSymtab();
92	92	check.checkExact("0 0 UND FUNC GLOBAL DEFAULT reallocarray");
	93	}
	94
	95	// before v2.38 strlcpy is not supported
	96	if (glibc_ver.order(.{ .major = 2, .minor = 38, .patch = 0 }) == .lt) {
	97	check.checkInDynamicSymtab();
	98	check.checkNotPresent("strlcpy");
93	99	} else {
94	100	check.checkInDynamicSymtab();
95		check.checkNotPresent("reallocarray");
	101	check.checkExact("0 0 UND FUNC GLOBAL DEFAULT strlcpy");
96	102	}
97	103
98	104	// v2.16 introduced getauxval(), so always present

test/link/glibc_compat/glibc_runtime_check.zig+22

...	...	@@ -16,6 +16,10 @@ const c_stdlib = @cImport(
16	16	@cInclude("stdlib.h"), // for atexit
17	17	);
18	18
	19	const c_string = @cImport(
	20	@cInclude("string.h"), // for strlcpy
	21	);
	22
19	23	// Version of glibc this test is being built to run against
20	24	const glibc_ver = builtin.target.os.version_range.linux.glibc;
21	25
...	...	@@ -73,6 +77,23 @@ fn checkGetAuxVal_v2_16() !void {
73	77	assert(pgsz != 0);
74	78	}
75	79
	80	// strlcpy introduced in v2.38, which is newer than many installed glibcs
	81	fn checkStrlcpy() !void {
	82	if (comptime glibc_ver.order(.{ .major = 2, .minor = 38, .patch = 0 }) == .lt) {
	83	if (@hasDecl(c_string, "strlcpy")) {
	84	@compileError("Before v2.38 glibc does not define 'strlcpy'");
	85	}
	86	} else {
	87	try checkStrlcpy_v2_38();
	88	}
	89	}
	90
	91	fn checkStrlcpy_v2_38() !void {
	92	var buf: [99]u8 = undefined;
	93	const used = c_string.strlcpy(&buf, "strlcpy works!", buf.len);
	94	assert(used == 15);
	95	}
	96
76	97	// atexit is part of libc_nonshared, so ensure its linked in correctly
77	98	fn forceExit0Callback() callconv(.C) void {
78	99	std.c.exit(0); // Override the main() exit code
...	...	@@ -86,6 +107,7 @@ fn checkAtExit() !void {
86	107	pub fn main() !u8 {
87	108	try checkStat();
88	109	try checkReallocarray();
	110	try checkStrlcpy();
89	111
90	112	try checkGetAuxVal();
91	113	try checkAtExit();