Address @robinlinden comments 2

.bazelrc

@@ -1,2 +1,7 @@
 build --features=layering_check
 build --enable_bzlmod
+
+build --enable_platform_specific_config
+build:linux --cxxopt=-std=c++17
+build:macos --cxxopt=-std=c++17
+build:windows --cxxopt=-std:c++17

.bcr/presubmit.yml

@@ -1,26 +1,42 @@
 matrix:
-  # Note that gcc 9 and earlier aren't supported due to using --std=c++2a
-  # instead of --std=c++20
-  platform:
-  - debian11
-  - ubuntu2204
-  - macos
-  - macos-arm64
-  - windows
   bazel:
-  #- 6.x -> Build fails with bazel 6.x
+    - 7.x
-  - 7.x
+    - 8.x
-  - 8.x
+    - rolling
+  unix_platform:
+    - debian11
+    - ubuntu2204
+    - macos
+    - macos_arm64
+  win_platform:
+    - windows
+
 tasks:
-  verify_targets:
+
-    name: Build and test.
+  unix_test:
-    platform: ${{ platform }}
+    name: Verify build targets on Unix
+    platform: ${{ unix_platform }}
     bazel: ${{ bazel }}
+    build_flags:
+    - --cxxopt=-std=c++17
     build_targets:
-    - '@ftxui//:ftxui'
-    - '@ftxui//:screen'
     - '@ftxui//:dom'
     - '@ftxui//:component'
+    - '@ftxui//:screen'
     test_targets:
     - '@ftxui//:tests'
 
+  windows_test:
+    name: Verify build targets
+    platform: ${{ win_platform }}
+    bazel: ${{ bazel }}
+    build_flags:
+    - --cxxopt=/std:c++17
+    build_targets:
+    - '@ftxui//:dom'
+    - '@ftxui//:component'
+    - '@ftxui//:screen'
+    test_targets:
+    - '@ftxui//:tests'
+
+

BUILD.bazel

@@ -12,7 +12,6 @@
 load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
 load(":bazel/ftxui.bzl", "ftxui_cc_library")
 load(":bazel/ftxui.bzl", "generate_examples")
-load(":bazel/ftxui.bzl", "cpp20")
 load(":bazel/ftxui.bzl", "windows_copts")
 load(":bazel/ftxui.bzl", "pthread_linkopts")
 
@@ -258,7 +257,7 @@ cc_test(
         "include",
         "src",
     ],
-    copts = cpp20() + windows_copts(),
+    copts = windows_copts(),
     deps = [
         ":screen",
         ":dom",

bazel/ftxui.bzl

@@ -3,24 +3,6 @@
 load("@rules_cc//cc:defs.bzl", "cc_library")
 load("@rules_cc//cc:defs.bzl", "cc_binary")
 
-def cpp17():
-    return select({
-        "@rules_cc//cc/compiler:msvc-cl": ["/std:c++17"],
-        "@rules_cc//cc/compiler:clang-cl": ["/std:c++17"],
-        "@rules_cc//cc/compiler:clang": ["-std=c++17"],
-        "@rules_cc//cc/compiler:gcc": ["-std=c++17"],
-        "//conditions:default": ["-std=c++17"],
-    })
-
-def cpp20():
-    return select({
-        "@rules_cc//cc/compiler:msvc-cl": ["/std:c++20"],
-        "@rules_cc//cc/compiler:clang-cl": ["/std:c++20"],
-        "@rules_cc//cc/compiler:clang": ["-std=c++20"],
-        "@rules_cc//cc/compiler:gcc": ["-std=c++20"],
-        "//conditions:default": ["-std=c++20"],
-    })
-
 # Microsoft terminal is a bit buggy ¯\_(ツ)_/¯ and MSVC uses bad defaults.
 def windows_copts():
     MSVC_COPTS = [
@@ -90,7 +72,7 @@ def ftxui_cc_library(
             "include",
             "src",
         ],
-        copts = cpp17() + windows_copts(),
+        copts = windows_copts(),
         visibility = ["//visibility:public"],
     )
 
@@ -118,5 +100,5 @@ def generate_examples():
               ":dom",
               ":screen",
             ],
-            copts = cpp20() + windows_copts(),
+            copts = windows_copts(),
         )

tools/test_bazel.sh

@@ -1,14 +1,8 @@
 # This script tests the project with different versions of Bazel and compilers
 # locally. This avoids waiting on the CI to run the tests.
 
-# Version
-# -------
-# - Version >= 7 are supported
-# - Version <= 6 fail with the error:
-#   Error:
-#     external/googletest~1.14.0.bcr.1/googletest/include/gtest/internal/gtest-port.h:279:2:
-#     error: #error C++ versions less than C++14 are not supported.
 for ver in \
+  "6.0.0" \
   "7.0.0" \
   "8.0.0"
 do