Fix toolchain collision

Hunter computes a toolchain-id using the compiler vendor, version, and
compile flags. The idea is that if you change some flag that will
change the ABI, it will compute a new toolchain-id which will rebuild
dependencies.

This toolchain-id is computed by taking all of those inputs and
computing a SHA1 digest, and then truncating it to the first 7
characeters.

On Debian 12 I'm finding that this constantly collides when switching
branches, which requires me to delete the build directory every time I
change to a new branch.

This change truncates the CONFIG-ID, TOOLCHAIN-ID and HUNTER-ID to 9
characters instead of 7, which resolves the problem for me.

Author: ambroff

cmake/modules/hunter_apply_gate_settings.cmake

@@ -56,9 +56,9 @@ function(hunter_apply_gate_settings)
   if(gate_done)
     if(cache_init)
       # set *_ID_PATH variables in parent scope
-      string(SUBSTRING "${HUNTER_SHA1}" 0 7 HUNTER_ID)
-      string(SUBSTRING "${HUNTER_CONFIG_SHA1}" 0 7 HUNTER_CONFIG_ID)
-      string(SUBSTRING "${HUNTER_TOOLCHAIN_SHA1}" 0 7 HUNTER_TOOLCHAIN_ID)
+      string(SUBSTRING "${HUNTER_SHA1}" 0 9 HUNTER_ID)
+      string(SUBSTRING "${HUNTER_CONFIG_SHA1}" 0 9 HUNTER_CONFIG_ID)
+      string(SUBSTRING "${HUNTER_TOOLCHAIN_SHA1}" 0 9 HUNTER_TOOLCHAIN_ID)
       set(HUNTER_ID_PATH "${HUNTER_CACHED_ROOT}/_Base/${HUNTER_ID}")
       set(HUNTER_TOOLCHAIN_ID_PATH "${HUNTER_ID_PATH}/${HUNTER_TOOLCHAIN_ID}")
       set(HUNTER_CONFIG_ID_PATH "${HUNTER_TOOLCHAIN_ID_PATH}/${HUNTER_CONFIG_ID}")

cmake/modules/hunter_calculate_self.cmake

@@ -12,7 +12,7 @@ function(hunter_calculate_self root version sha1 result)
   hunter_assert_not_empty_string("${sha1}")
   hunter_assert_not_empty_string("${result}")
 
-  string(SUBSTRING "${sha1}" 0 7 archive_id)
+  string(SUBSTRING "${sha1}" 0 9 archive_id)
 
   if(EXISTS "${root}/cmake/Hunter")
     set(hunter_self "${root}")

cmake/modules/hunter_download.cmake

@@ -195,7 +195,7 @@ function(hunter_download)
   endif()
 
   if(HUNTER_PACKAGE_SCHEME_UNPACK)
-    string(SUBSTRING "${HUNTER_PACKAGE_SHA1}" 0 7 x)
+    string(SUBSTRING "${HUNTER_PACKAGE_SHA1}" 0 9 x)
     set(hunter_lock_sources TRUE)
     set(
         hunter_lock_sources_dir

cmake/modules/hunter_download_cache_raw_file.cmake

@@ -96,7 +96,7 @@ function(hunter_download_cache_raw_file)
       if(NOT is_github)
         set(url "${server}/raw/${suffix}")
       else()
-        string(SUBSTRING "${suffix}" 0 7 cache_tag)
+        string(SUBSTRING "${suffix}" 0 9 cache_tag)
         set(url "${server}/releases/download/cache-${cache_tag}/${suffix}")
       endif()
 

cmake/modules/hunter_download_server_url.cmake

@@ -63,7 +63,7 @@ function(hunter_download_server_url)
   set(hunter_url_list) # list of URLs to try downloading from
 
   # extract archive-ID from archive SHA1
-  string(SUBSTRING "${x_SHA1}" 0 7 archive_id)
+  string(SUBSTRING "${x_SHA1}" 0 9 archive_id)
 
   # get filename from download URL
   get_filename_component(package_filename_raw "${x_URL}" NAME)

cmake/modules/hunter_finalize.cmake

@@ -72,9 +72,9 @@ macro(hunter_finalize)
   # * define HUNTER_CONFIG_ID_PATH
   hunter_apply_gate_settings()
 
-  string(SUBSTRING "${HUNTER_SHA1}" 0 7 HUNTER_ID)
-  string(SUBSTRING "${HUNTER_CONFIG_SHA1}" 0 7 HUNTER_CONFIG_ID)
-  string(SUBSTRING "${HUNTER_TOOLCHAIN_SHA1}" 0 7 HUNTER_TOOLCHAIN_ID)
+  string(SUBSTRING "${HUNTER_SHA1}" 0 9 HUNTER_ID)
+  string(SUBSTRING "${HUNTER_CONFIG_SHA1}" 0 9 HUNTER_CONFIG_ID)
+  string(SUBSTRING "${HUNTER_TOOLCHAIN_SHA1}" 0 9 HUNTER_TOOLCHAIN_ID)
 
   set(HUNTER_INSTALL_PREFIX "${HUNTER_CONFIG_ID_PATH}/Install")
   list(APPEND CMAKE_PREFIX_PATH "${HUNTER_INSTALL_PREFIX}")

cmake/modules/hunter_make_directory.cmake

@@ -12,7 +12,7 @@ function(hunter_make_directory parent sha1 result)
   hunter_assert_not_empty_string("${sha1}")
   hunter_assert_not_empty_string("${result}")
 
-  string(SUBSTRING "${sha1}" 0 7 dir_id)
+  string(SUBSTRING "${sha1}" 0 9 dir_id)
 
   set(dir_path "${parent}/${dir_id}")
   set(done_path "${dir_path}/DONE")