Document new -P functionality

3 files changed, 9 insertions, 5 deletions

diff --git a/_ldid b/_ldid
index db8a90a..ed7bf90 100644
--- a/_ldid
+++ b/_ldid
@@ -12,6 +12,6 @@ _arguments \
 	'-H-[Hash type]:hash:(sha1 sha256)' \
 	'-I-[Set identifier]:identifier' \
 	'-K-[Signing private key]:key:_files' \
-	'-P[Set as platform]' \
+	'-P-[Set as platform]:number' \
 	'-U-[Password for -K]' \
 	'*: :_files'
diff --git a/docs/ldid.1 b/docs/ldid.1
index 4034137..2f13068 100644
--- a/docs/ldid.1
+++ b/docs/ldid.1
@@ -22,7 +22,7 @@
 .Op Fl I Ns Ar name
 .Op Fl K Ns Ar key.p12 Op Fl U Ns Ar password
 .Op Fl M
-.Op Fl P
+.Op Fl P Ns Op Ar num
 .Op Fl Q Ns Ar requirements
 .Op Fl q
 .Op Fl r | Fl S Ns Ar file.xml | Fl s
@@ -106,8 +106,12 @@ When used with
 merge the new and existing entitlements instead of replacing the existing
 entitlements, this is useful for adding a few specific entitlements to a
 handful of binaries.
-.It Fl P
+.It Fl P Ns Op Ar num
 Mark the Mach-O as a platform binary.
+If
+.Ar num
+is specified, the platform field in the CodeDirectory will be set to that number.
+The default is 13, as per Apple binaries.
 .It Fl Q Ns Ar requirements.xml
 Embed the requirements found in
 .Ar requirements .
diff --git a/ldid.cpp b/ldid.cpp
index 2e54207..4d19c93 100644
--- a/ldid.cpp
+++ b/ldid.cpp
@@ -3144,9 +3144,9 @@ static void usage(const char *argv0) {
     fprintf(stderr, "Usage: %s [-Acputype:subtype] [-a] [-C[adhoc | enforcement | expires | hard |\n", argv0);
     fprintf(stderr, "            host | kill | library-validation | restrict | runtime]] [-D] [-d]\n");
     fprintf(stderr, "            [-Enum:file] [-e] [-H[sha1 | sha256]] [-h] [-Iname]\n");
-    fprintf(stderr, "            [-Kkey.p12 [-Upassword]] [-M] [-P] [-Qrequirements.xml] [-q]\n");
+    fprintf(stderr, "            [-Kkey.p12 [-Upassword]] [-M] [-P[num]] [-Qrequirements.xml] [-q]\n");
     fprintf(stderr, "            [-r | -Sfile.xml | -s] [-u] [-arch arch_type] file ...\n");
-    fprintf(stderr, "Options:\n");
+    fprintf(stderr, "Common Options:\n");
     fprintf(stderr, "   -S[file.xml]  Pseudo-sign using the entitlements in file.xml\n");
     fprintf(stderr, "   -Kkey.p12     Sign using private key in key.p12\n");
     fprintf(stderr, "   -Upassword    Use password to unlock key.p12\n");