tiras-j

diff --git a/build.rs b/build.rs
index c3ac6c6..76ffe9d 100644
--- a/build.rs
+++ b/build.rs
@@ -104,6 +104,7 @@ fn build_zlib(cfg: &mut cc::Build, target: &str) {
         cfg.define("STDC", None);
         cfg.define("_LARGEFILE64_SOURCE", None);
         cfg.define("_POSIX_SOURCE", None);
+        cfg.define("_C99_SOURCE", None);
         cfg.flag("-fvisibility=hidden");

tiras-j

336 #if __DARWIN_C_LEVEL >= 200112L || defined(_C99_SOURCE) || defined(__cplusplus)
337 __BEGIN_DECLS
338 int  snprintf(char * __restrict __str, size_t __size, const char * __restrict __format, ...) __printflike(3, 4);
339 int  vfscanf(FILE * __restrict __stream, const char * __restrict __format, va_list) __scanflike(2, 0);
340 int  vscanf(const char * __restrict __format, va_list) __scanflike(1, 0);
341 int  vsnprintf(char * __restrict __str, size_t __size, const char * __restrict __format, va_list) __printflike(3, 0);
342 int  vsscanf(const char * __restrict __str, const char * __restrict __format, va_list) __scanflike(2, 0);
343 __END_DECLS
344 #endif /* __DARWIN_C_LEVEL >= 200112L || defined(_C99_SOURCE) || defined(__cplusplus) */

tiras-j

test.c:
#include <stdio.h>

int main(int argc, char *argv[]) {
    char buf[128] = {0};

    printf("TESTING TESTING TESTING\n");
    snprintf(buf, 128, "%s", "TESTING TESTING TESTING\n");
    printf("%s", buf);
}

tiras-j

$ cargo build --release --target=armv7s-apple-ios
   Compiling pkg-config v0.3.14
   Compiling cc v1.0.25
   Compiling libc v0.2.43
   Compiling libz-sys v1.0.21 (file:///Users/jot/libz-sys)
warning: src/zlib/gzlib.c:214:15: warning: implicitly declaring library function 'snprintf' with type 'int (char *, unsigned long, const char *, ...)' [-Wimplicit-function-declaration]
warning:         (void)snprintf(state->path, len + 1, "%s", (const char *)path);
warning:               ^
warning: src/zlib/gzlib.c:214:15: note: include the header <stdio.h> or explicitly provide a declaration for 'snprintf'
warning: 1 warning generated.

tiras-j

$ cargo build --release --target=armv7-apple-ios
   Compiling pkg-config v0.3.14
   Compiling cc v1.0.25
   Compiling libc v0.2.43
   Compiling libz-sys v1.0.21 (file:///Users/jot/libz-sys)
warning: src/zlib/gzlib.c:214:15: warning: implicitly declaring library function 'snprintf' with type 'int (char *, unsigned long, const char *, ...)' [-Wimplicit-function-declaration]
warning:         (void)snprintf(state->path, len + 1, "%s", (const char *)path);
warning:               ^
warning: src/zlib/gzlib.c:214:15: note: include the header <stdio.h> or explicitly provide a declaration for 'snprintf'
warning: 1 warning generated.

tiras-j

$ cargo build --release --target=aarch64-apple-ios
   Compiling cc v1.0.25
   Compiling pkg-config v0.3.14
   Compiling libc v0.2.43
   Compiling libz-sys v1.0.21 (file:///Users/jot/libz-sys)
error: failed to run custom build command for `libz-sys v1.0.21 (file:///Users/jot/libz-sys)`
process didn't exit successfully: `/Users/jot/libz-sys/target/release/build/libz-sys-830cfa7a396b97c0/build-script-build` (exit code: 101)
--- stdout
cargo:rerun-if-env-changed=LIBZ_SYS_STATIC
cargo:rerun-if-changed=build.rs