[PATCH v2] winegcc: Identify ar files through signature

[Tatsuyuki Ishi]

We would like to build Wine modules with Rust, using winebuild for the
link stage.

Rust uses the ".rlib" extension for intermediate libraries which it
passes to the linker. Detect them through signature so that winegcc will
not try to compile it.

v2: Update the ar signature to the canonical (and more correct) one.
---
 tools/winegcc/utils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/winegcc/utils.c b/tools/winegcc/utils.c
index 409ae26cd82..4b4498a59fa 100644
--- a/tools/winegcc/utils.c
+++ b/tools/winegcc/utils.c
@@ -63,6 +63,7 @@ file_type get_file_type(const char* filename)
     /* see tools/winebuild/res32.c: check_header for details */
     static const char res_sig[] = { 0,0,0,0, 32,0,0,0, 0xff,0xff, 0,0, 0xff,0xff, 0,0, 0,0,0,0, 0,0, 0,0, 0,0,0,0, 0,0,0,0 };
     static const char elf_sig[4] = "\177ELF";
+    static const char ar_sig[8] = "!<arch>\n";
     char buf[sizeof(res_sig)];
     int fd, cnt;
 
@@ -83,6 +84,7 @@ file_type get_file_type(const char* filename)
     if (strendswith(filename, ".spec")) return file_spec;
     if (strendswith(filename, ".rc")) return file_rc;
     if (cnt >= sizeof(elf_sig) && !memcmp(buf, elf_sig, sizeof(elf_sig))) return file_so;  /* ELF lib */
+    if (cnt >= sizeof(ar_sig) && !memcmp(buf, ar_sig, sizeof(ar_sig))) return file_arh;
     if (cnt >= sizeof(unsigned int) &&
         (*(unsigned int *)buf == 0xfeedface || *(unsigned int *)buf == 0xcefaedfe ||
          *(unsigned int *)buf == 0xfeedfacf || *(unsigned int *)buf == 0xcffaedfe))
-- 
2.35.1