[3.13] gh-156115: Use the simulator deployment-target flag for iOS simulator builds (GH-156116) (#156213)

https://github.com/python/cpython/commit/5f6487acc6b8f751d29234cb8d11fb40bd9b84d8
commit: 5f6487acc6b8f751d29234cb8d11fb40bd9b84d8
branch: 3.13
author: Miss Islington (bot) <[email protected]>
committer: freakboy3742 <[email protected]>
date: 2026-08-22T03:22:16Z
summary:

[3.13] gh-156115: Use the simulator deployment-target flag for iOS simulator builds (GH-156116) (#156213)

Ensures that CFLAGS and LDFLAGS use -mios-simulator-version-min, rather
than the device-based -mios-version-min. This only matters if the CFLAGS
and LDFLAGS are used in a bare call to clang without a -target; but that is
a legal usage, so it's worth catching.
(cherry picked from commit d856402e7176e5a03c5c578f0efc1be968be3257)

Co-authored-by: Clément Péron <[email protected]>

files:
A Misc/NEWS.d/next/Build/2026-08-20-14-02-33.gh-issue-156115.KXr8wU.rst
M configure
M configure.ac

diff --git a/Misc/NEWS.d/next/Build/2026-08-20-14-02-33.gh-issue-156115.KXr8wU.rst b/Misc/NEWS.d/next/Build/2026-08-20-14-02-33.gh-issue-156115.KXr8wU.rst
new file mode 100644
index 000000000000000..612180d3b65db21
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-08-20-14-02-33.gh-issue-156115.KXr8wU.rst
@@ -0,0 +1,4 @@
+iOS simulator builds are now configured with
+``-mios-simulator-version-min`` instead of the device's
+``-mios-version-min``. The device flag made the linker reject libraries
+resolved from the simulator SDK, so library detection silently failed.
diff --git a/configure b/configure
index 51e657ff0d61e31..b966078962d8a33 100755
--- a/configure
+++ b/configure
@@ -4703,8 +4703,13 @@ case $host in #(
      ;;
 esac
 
-case $ac_sys_system in #(
-  iOS) :
+case $host in #(
+  *-apple-ios*-simulator) :
+
+    as_fn_append CFLAGS " -mios-simulator-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"
+    as_fn_append LDFLAGS " -mios-simulator-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"
+   ;; #(
+  *-apple-ios*) :
 
     as_fn_append CFLAGS " -mios-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"
     as_fn_append LDFLAGS " -mios-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"
diff --git a/configure.ac b/configure.ac
index f93a9f29b39aff8..7614dfb79e74a65 100644
--- a/configure.ac
+++ b/configure.ac
@@ -945,8 +945,12 @@ AS_CASE([$host],
 )
 
 dnl Add the compiler flag for the iOS minimum supported OS version.
-AS_CASE([$ac_sys_system],
-  [iOS], [
+AS_CASE([$host],
+  [*-apple-ios*-simulator], [
+    AS_VAR_APPEND([CFLAGS], [" -mios-simulator-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"])
+    AS_VAR_APPEND([LDFLAGS], [" -mios-simulator-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"])
+  ],
+  [*-apple-ios*], [
     AS_VAR_APPEND([CFLAGS], [" -mios-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"])
     AS_VAR_APPEND([LDFLAGS], [" -mios-version-min=${IPHONEOS_DEPLOYMENT_TARGET}"])
   ],

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