From d577228bbda482d469f7417681c4b00fff54d100 Mon Sep 17 00:00:00 2001
From: Alexei Lozovsky <alexei@cossacklabs.com>
Date: Sat, 9 May 2020 15:52:42 +0300
Subject: [PATCH] Make minimum SDK version configurable

In some use cases it's necessary to support older systems. Currently
minimum SDK versions are set to reasonable defaults, but there is no
easy way to override them.

Introduce a new set of command-line flags to set different minimum SDK
versions, similar to how it's possible to override the default target
SDK version:

    --min-macos-sdk
    --min-ios-sdk
    --min-tvos-sdk
    --min-watchos-sdk

Also, output the selected minimum SDK version along with the target one
on the configuration readout. It makes it easier to confirm that the
configuration is the one you expect.
---
 build-libssl.sh | 31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/build-libssl.sh b/build-libssl.sh
index d381ada..13dbd38 100755
--- a/build-libssl.sh
+++ b/build-libssl.sh
@@ -53,8 +53,13 @@ echo_help()
   echo " -h, --help                        Print help (this message)"
   echo "     --macos-sdk=SDKVERSION        Override macOS SDK version"
   echo "     --ios-sdk=SDKVERSION          Override iOS SDK version"
-  echo "     --noparallel                  Disable running make with parallel jobs (make -j)"
   echo "     --tvos-sdk=SDKVERSION         Override tvOS SDK version"
+  echo "     --watchos-sdk=SDKVERSION      Override watchOS SDK version"
+  echo "     --min-macos-sdk=SDKVERSION    Set minimum macOS SDK version (default: $MACOS_MIN_SDK_VERSION)"
+  echo "     --min-ios-sdk=SDKVERSION      Set minimum iOS SDK version (default: $IOS_MIN_SDK_VERSION)"
+  echo "     --min-tvos-sdk=SDKVERSION     Set minimum tvOS SDK version (default: $TVOS_MIN_SDK_VERSION)"
+  echo "     --min-watchos-sdk=SDKVERSION  Set minimum watchOS SDK version (default: $WATCHOS_MIN_SDK_VERSION)"
+  echo "     --noparallel                  Disable running make with parallel jobs (make -j)"
   echo "     --disable-bitcode             Disable embedding Bitcode"
   echo " -v, --verbose                     Enable verbose logging"
   echo "     --verbose-on-error            Dump last 500 lines from log file if an error occurs (for Travis builds)"
@@ -265,6 +270,22 @@ case $i in
     WATCHOS_SDKVERSION="${i#*=}"
     shift
     ;;
+  --min-macos-sdk=*)
+    MACOS_MIN_SDK_VERSION="${i#*=}"
+    shift
+    ;;
+  --min-ios-sdk=*)
+    IOS_MIN_SDK_VERSION="${i#*=}"
+    shift
+    ;;
+  --min-tvos-sdk=*)
+    TVOS_MIN_SDK_VERSION="${i#*=}"
+    shift
+    ;;
+  --min-watchos-sdk=*)
+    WATCHOS_MIN_SDK_VERSION="${i#*=}"
+    shift
+    ;;
   -v|--verbose)
     LOG_VERBOSE="verbose"
     ;;
@@ -413,10 +434,10 @@ if [ "${BUILD_TYPE}" == "archs" ]; then
 else
   echo "  Targets: ${TARGETS}"
 fi
-echo "  macOS SDK: ${MACOS_SDKVERSION}"
-echo "  iOS SDK: ${IOS_SDKVERSION}"
-echo "  tvOS SDK: ${TVOS_SDKVERSION}"
-echo "  watchOS SDK: ${WATCHOS_SDKVERSION}"
+echo "  macOS SDK: ${MACOS_SDKVERSION} (min ${MACOS_MIN_SDK_VERSION})"
+echo "  iOS SDK: ${IOS_SDKVERSION} (min ${IOS_MIN_SDK_VERSION})"
+echo "  tvOS SDK: ${TVOS_SDKVERSION} (min ${TVOS_MIN_SDK_VERSION})"
+echo "  watchOS SDK: ${WATCHOS_SDKVERSION} (min ${WATCHOS_MIN_SDK_VERSION})"
 if [ "${CONFIG_DISABLE_BITCODE}" == "true" ]; then
   echo "  Bitcode embedding disabled"
 fi