Doc additions and minor cleanups in the --flag alias handling.

FossilOrigin-Name: 37a1da038195365cd7eb866b3aa749ad8060a656ac38063520fdb70cf0a0e5f1

auto.def

@@ -207,9 +207,11 @@ if {"" ne $DUMP_DEFINES_JSON} {
 options [subst $flags]
 unset flags
 
-# Apply values from hidden --flag aliases over to their canonical
+#
+# Carry values from hidden --flag aliases over to their canonical flag
 # forms.
-foreach {hidden flag canonical} {
+#
+foreach {hidden => canonical} {
   with-readline-inc => with-readline-cflags
   with-readline-lib => with-readline-ldflags
 } {

autosetup/hwaci-common.tcl

@@ -979,17 +979,23 @@ proc hwaci-dump-defs-json {file args} {
 ########################################################################
 # Expects configure flags with the given names to have been registered
 # with autosetup. If [opt-val $hidden] has a value but [opt-val
-# $canonical] does not, it copies the former over the latter.  If both
-# have explicit values a fatal usage error is triggered.
+# $canonical] does not, it copies the former over the latter. If
+# $hidden has no value set, this is a no-op. If both have explicit
+# values a fatal usage error is triggered.
 #
-# Autosetup accounts for hidden aliases in [options] lists but does no
-# further handling of them, e.g. fetching [opt-val foo] will not, even
-# if foo is an alias for bar, see a value passed in as --bar=baz.
+# Motivation: autosetup accounts for hidden aliases in [options] lists
+# but does no further handling of them. For example, when --foo is a
+# hidden alias of the canonical flag --bar, and a user passes --foo=X,
+# [opt-val bar] returns no value. i.e. the script must check both
+# [opt-val foo] and [opt-val bar], despite them being aliases. The
+# intent is that this function be passed each such mapping immediately
+# after [options] is processed, to carry over any values from hidden
+# aliases into their canonical names, so that in the above example
+# [opt-value bar] will return X if --foo=X is passed in.
 proc hwaci-xfer-opt-alias {hidden canonical} {
   set x [opt-val $hidden "-9-9-9-"]
   if {"-9-9-9-" ne $x} {
-    set y [opt-val $canonical "-0-0-0-"]
-    if {"-0-0-0-" eq $y} {
+    if {"-0-0-0-" eq [opt-val $canonical "-0-0-0-"]} {
       hwaci-opt-set $canonical $x
     } else {
       hwaci-fatal "both --$canonical and its hidden alias --$hidden were used. Use only one or the other."

manifest

@@ -1,5 +1,5 @@
-C Rename\s--with-readline-lib/inc\sto\s--with-readline-ldflags/cflags,\sfor\sclarity,\sbut\sretain\sthe\solder\snames\sas\saliases\susing\sautosetup's\s"hidden\salias"\sfeature.\sRename\sthe\snewly-added\s--with-icu-lib\sto\s--with-icu-ldflags\s(with\sno\sbackwards\scompatibility).
-D 2024-10-27T20:04:23.738
+C Doc\sadditions\sand\sminor\scleanups\sin\sthe\s--flag\salias\shandling.
+D 2024-10-27T20:14:49.852
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md b6e6c1baf38e4339bd3f1e0e5e5bfd0a9a93d133360691b2785c2d4b2f2dcec2
@@ -13,7 +13,7 @@ F art/icon-80x90.gif 65509ce3e5f86a9cd64fe7fca2d23954199f31fe44c1e09e208c80fb83d
 F art/sqlite370.eps aa97a671332b432a54e1d74ff5e8775be34200c2
 F art/sqlite370.ico af56c1d00fee7cd4753e8631ed60703ed0fc6e90
 F art/sqlite370.jpg d512473dae7e378a67e28ff96a34da7cb331def2
-F auto.def 7f4a0a1421306ed8bca11d54b754f01dbf76054d17894c7c88fad0c05e2fadba
+F auto.def a5cc3792cfe6e82561c810f5f6383186ee5ce73cdde4ca06b70f18252ec38f84
 F autoconf/INSTALL 83e4a25da9fd053c7b3665eaaaf7919707915903
 F autoconf/Makefile.am adedc1324b6a87fdd1265ddd336d2fb7d4f36a0e77b86ea553ae7cc4ea239347
 F autoconf/Makefile.fallback 22fe523eb36dfce31e0f6349f782eb084e86a5620b2b0b4f84a2d6133f53f5ac
@@ -47,7 +47,7 @@ F autosetup/cc-lib.tcl 493c5935b5dd3bf9bd4eca89b07c8b1b1a9356d61783035144e21795f
 F autosetup/cc-shared.tcl 4f024e94a47f427ba61de1739f6381ef0080210f9fae89112d5c1de1e5460d78
 F autosetup/cc.tcl 7e2fe943ae9d45cf39e9f5b05b6230df8e719415edea5af06c30eb68680bde14
 F autosetup/default.auto 5cdf016de2140e50f1db190a02039dc42fb390af1dda4cc4853e3042a9ef0e82
-F autosetup/hwaci-common.tcl 7839c061ae85648d1440ef95f75f4c1f18008458b7a3a81beaebeb7d2470a0dc
+F autosetup/hwaci-common.tcl f8b683adc42ac4a9d1a950118f024b8b7d2b90460ee39c5a9a0feb8e7ad9d179
 F autosetup/jimsh0.c 27ea5f221359ef6c58780fc6c185aadbf8d3bee9a021331a3e5de0eba0dc6de6
 F autosetup/pkg-config.tcl 4e635bf39022ff65e0d5434339dd41503ea48fc53822c9c5bde88b02d3d952ba
 F autosetup/system.tcl 3a39d6e0b3bfba526fd39afe07c1d0d325e5a31925013a1ba7c671e1128e31bb
@@ -2237,8 +2237,8 @@ F vsixtest/vsixtest.tcl 6195aba1f12a5e10efc2b8c0009532167be5e301abe5b31385638080
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P abec913c00564ee5453075f45b1a6680e92ee1b1e61e3b19e4cf74e46785d3bf
-R 8c93632539b57f8beda5bb3056f97174
+P e50a03f9f2a40a5e65f874ffff234a7b397ce4ebdc7b360d4e6ade7575577c38
+R 689f8e7c0b273a0d5f61c39635b6551a
 U stephan
-Z 46a44527cb166d23de983b40142b0922
+Z 9c99ac6705fb06550102fd68e4fd933c
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-e50a03f9f2a40a5e65f874ffff234a7b397ce4ebdc7b360d4e6ade7575577c38
+37a1da038195365cd7eb866b3aa749ad8060a656ac38063520fdb70cf0a0e5f1