Merge bitcoin/bitcoin#22993: build: set OSX_MIN_VERSION to 10.15

a43b8e955558483d8893996cc3a67bc74cbaf358 build: set OSX_MIN_VERSION to 10.15 (fanquake)

Pull request description:

  Taken out of #20744, as splitting up some of the build changes was mentioned [here](https://github.com/bitcoin/bitcoin/pull/22937#discussion_r707303172).

  This is required to use `std::filesystem` on macOS, as support for it only landed in the libc++.dylib shipped with 10.15. So if we want to move to using `std::filesystem` for `23.0`, this bump is required.

  See also: https://developer.apple.com/documentation/xcode-release-notes/xcode-11-release-notes

  > Clang now supports the C++17 \<filesystem\> library for iOS 13, macOS 10.15, watchOS 6, and tvOS 13.

  macOS 10.15 was released in October 2019. macOS OS's seem to have a life of about 3 years, so it's possible that 10.14 will become officially unsupported by the end of 2021 and prior to the release of 23.0.

  Guix builds:
  ```bash
  bash-5.1# find guix-build-$(git rev-parse --short=12 HEAD)/output/ -type f -print0 | env LC_ALL=C sort -z | xargs -r0 sha256sum
  abc8b749be65f1339dcdf44bd1ed6ade2533b8e3b5030ad1dde0ae0cede78136  guix-build-a43b8e955558/output/dist-archive/bitcoin-a43b8e955558.tar.gz
  1edcc301eb4c02f3baa379beb8d4c78e661abc24a293813bc9d900cf7255b790  guix-build-a43b8e955558/output/x86_64-apple-darwin19/SHA256SUMS.part
  e9dbb5594a664519da778dde9ed861c3f0f631525672e17a67eeda599f16ff44  guix-build-a43b8e955558/output/x86_64-apple-darwin19/bitcoin-a43b8e955558-osx-unsigned.dmg
  11b23a17c630dddc7594c25625eea3de42db50f355733b9ce9ade2d8eba3a8f3  guix-build-a43b8e955558/output/x86_64-apple-darwin19/bitcoin-a43b8e955558-osx-unsigned.tar.gz
  257ba64a327927f94d9aa0a68da3a2695cf880b3ed1a0113c5a966dcc426eb5e  guix-build-a43b8e955558/output/x86_64-apple-darwin19/bitcoin-a43b8e955558-osx64.tar.gz
  ```

ACKs for top commit:
  hebasto:
    ACK a43b8e955558483d8893996cc3a67bc74cbaf358
  jarolrod:
    ACK a43b8e9

Tree-SHA512: 9ac77be7cb56c068578860a3b2b8b7487c9e18b71b14aedd77a9c663f5d4bb19756d551770c02ddd12f1797beea5757b261588e7b67fb53509bb998ee8022369

6 files changed, 10 insertions, 10 deletions

diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
index 61f727fa63..98cab1b7fc 100755
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -217,7 +217,7 @@ def check_MACHO_libraries(filename) -> bool:
 
 def check_MACHO_min_os(filename) -> bool:
     binary = lief.parse(filename)
-    if binary.build_version.minos == [10,14,0]:
+    if binary.build_version.minos == [10,15,0]:
         return True
     return False
 
diff --git a/contrib/devtools/test-symbol-check.py b/contrib/devtools/test-symbol-check.py
index 2da7ae793d..651589c11b 100755
--- a/contrib/devtools/test-symbol-check.py
+++ b/contrib/devtools/test-symbol-check.py
@@ -137,7 +137,7 @@ class TestSymbolChecks(unittest.TestCase):
                 }
         ''')
 
-        self.assertEqual(call_symbol_check(cc, source, executable, ['-Wl,-platform_version','-Wl,macos', '-Wl,10.14', '-Wl,11.4']),
+        self.assertEqual(call_symbol_check(cc, source, executable, ['-Wl,-platform_version','-Wl,macos', '-Wl,10.15', '-Wl,11.4']),
                 (1, f'{executable}: failed SDK'))
 
     def test_PE(self):
diff --git a/contrib/guix/README.md b/contrib/guix/README.md
index ee2b7a574a..51a034c26e 100644
--- a/contrib/guix/README.md
+++ b/contrib/guix/README.md
@@ -75,7 +75,7 @@ crucial differences:
 
 1. Since only Windows and macOS build outputs require codesigning, the `HOSTS`
    environment variable will have a sane default value of `x86_64-w64-mingw32
-   x86_64-apple-darwin18` instead of all the platforms.
+   x86_64-apple-darwin19` instead of all the platforms.
 2. The `guix-codesign` command ***requires*** a `DETACHED_SIGS_REPO` flag.
     * _**DETACHED_SIGS_REPO**_
 
@@ -159,7 +159,7 @@ which case you can override the default list by setting the space-separated
 `HOSTS` environment variable:
 
 ```sh
-env HOSTS='x86_64-w64-mingw32 x86_64-apple-darwin18' ./contrib/guix/guix-build
+env HOSTS='x86_64-w64-mingw32 x86_64-apple-darwin19' ./contrib/guix/guix-build
 ```
 
 See the [recognized environment variables][env-vars-list] section for more
@@ -224,7 +224,7 @@ details.
 
   _(defaults to "x86\_64-linux-gnu arm-linux-gnueabihf aarch64-linux-gnu
   riscv64-linux-gnu powerpc64-linux-gnu powerpc64le-linux-gnu
-  x86\_64-w64-mingw32 x86\_64-apple-darwin18")_
+  x86\_64-w64-mingw32 x86\_64-apple-darwin19")_
 
 * _**SOURCES_PATH**_
 
diff --git a/contrib/guix/guix-build b/contrib/guix/guix-build
index dd7229b6fa..9317fa7fde 100755
--- a/contrib/guix/guix-build
+++ b/contrib/guix/guix-build
@@ -76,7 +76,7 @@ mkdir -p "$VERSION_BASE"
 # Default to building for all supported HOSTs (overridable by environment)
 export HOSTS="${HOSTS:-x86_64-linux-gnu arm-linux-gnueabihf aarch64-linux-gnu riscv64-linux-gnu powerpc64-linux-gnu powerpc64le-linux-gnu
                        x86_64-w64-mingw32
-                       x86_64-apple-darwin18}"
+                       x86_64-apple-darwin19}"
 
 # Usage: distsrc_for_host HOST
 #
diff --git a/contrib/guix/guix-codesign b/contrib/guix/guix-codesign
index 3f464f89e6..aff897037d 100755
--- a/contrib/guix/guix-codesign
+++ b/contrib/guix/guix-codesign
@@ -91,7 +91,7 @@ fi
 ################
 
 # Default to building for all supported HOSTs (overridable by environment)
-export HOSTS="${HOSTS:-x86_64-w64-mingw32 x86_64-apple-darwin18}"
+export HOSTS="${HOSTS:-x86_64-w64-mingw32 x86_64-apple-darwin19}"
 
 # Usage: distsrc_for_host HOST
 #
diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 356bd70070..93526f8c45 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -147,7 +147,7 @@ case "$HOST" in
         #
         # After the native packages in depends are built, the ld wrapper should
         # no longer affect our build, as clang would instead reach for
-        # x86_64-apple-darwin18-ld from cctools
+        # x86_64-apple-darwin19-ld from cctools
         ;;
     *) export GUIX_LD_WRAPPER_DISABLE_RPATH=yes ;;
 esac
@@ -423,8 +423,8 @@ mkdir -p "$DISTSRC"
                 find "${DISTNAME}" -print0 \
                     | sort --zero-terminated \
                     | tar --create --no-recursion --mode='u+rw,go+r-w,a+X' --null --files-from=- \
-                    | gzip -9n > "${OUTDIR}/${DISTNAME}-${HOST//x86_64-apple-darwin18/osx64}.tar.gz" \
-                    || ( rm -f "${OUTDIR}/${DISTNAME}-${HOST//x86_64-apple-darwin18/osx64}.tar.gz" && exit 1 )
+                    | gzip -9n > "${OUTDIR}/${DISTNAME}-${HOST//x86_64-apple-darwin19/osx64}.tar.gz" \
+                    || ( rm -f "${OUTDIR}/${DISTNAME}-${HOST//x86_64-apple-darwin19/osx64}.tar.gz" && exit 1 )
                 ;;
         esac
     )  # $DISTSRC/installed