[libcxx-commits] [libcxx] [libc++] Define all CMake configuration features in the same location (PR #115361)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne created https://github.com/llvm/llvm-project/pull/115361

This moves the configuration of the CMake features to turn off RTTI, exceptions and friends to the beginning of the CMake file, where we configure other optional parts of the library.

This fixes an important bug where we would disable the benchmarks because these options were not defined yet, leading to the build thinking they were defined to OFF.

>From f10bb0bfdcb2d549f00a0608b0a60160e41007a6 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2 at gmail.com>
Date: Thu, 7 Nov 2024 14:05:08 -0500
Subject: [PATCH] [libc++] Define all CMake configuration features in the same
 location

This moves the configuration of the CMake features to turn off
RTTI, exceptions and friends to the beginning of the CMake file,
where we configure other optional parts of the library.

This fixes an important bug where we would disable the benchmarks
because these options were not defined yet, leading to the build
thinking they were defined to OFF.
---
 libcxx/CMakeLists.txt | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index d699135774ee0b..abe12c2805a7cf 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -47,6 +47,10 @@ include(HandleCompilerRT)
 # Basic options ---------------------------------------------------------------
 option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
 option(LIBCXX_ENABLE_STATIC "Build libc++ as a static library." ON)
+option(LIBCXX_ENABLE_EXCEPTIONS "Enable exceptions in the built library." ON)
+option(LIBCXX_ENABLE_RTTI
+  "Use runtime type information.
+  This option may only be set to OFF when LIBCXX_ENABLE_EXCEPTIONS=OFF." ON)
 option(LIBCXX_ENABLE_FILESYSTEM
   "Whether to include support for parts of the library that rely on a filesystem being
    available on the platform. This includes things like most parts of <filesystem> and
@@ -97,6 +101,10 @@ option(LIBCXX_ENABLE_WIDE_CHARACTERS
    support the C functionality for wide characters. When wide characters are
    not supported, several parts of the library will be disabled, notably the
    wide character specializations of std::basic_string." ON)
+option(LIBCXX_ENABLE_THREADS "Build libc++ with support for threads." ON)
+option(LIBCXX_ENABLE_MONOTONIC_CLOCK
+  "Build libc++ with support for a monotonic clock.
+  This option may only be set to OFF when LIBCXX_ENABLE_THREADS=OFF." ON)
 
 # To use time zone support in libc++ the platform needs to have the IANA
 # database installed. Libc++ will fail to build if this is enabled on a
@@ -284,14 +292,6 @@ if (LIBCXX_BUILD_32_BITS)
 endif()
 
 # Feature options -------------------------------------------------------------
-option(LIBCXX_ENABLE_EXCEPTIONS "Use exceptions." ON)
-option(LIBCXX_ENABLE_RTTI
-  "Use runtime type information.
-   This option may only be set to OFF when LIBCXX_ENABLE_EXCEPTIONS=OFF." ON)
-option(LIBCXX_ENABLE_THREADS "Build libc++ with support for threads." ON)
-option(LIBCXX_ENABLE_MONOTONIC_CLOCK
-  "Build libc++ with support for a monotonic clock.
-   This option may only be set to OFF when LIBCXX_ENABLE_THREADS=OFF." ON)
 option(LIBCXX_HAS_MUSL_LIBC "Build libc++ with support for the Musl C library" OFF)
 option(LIBCXX_HAS_PTHREAD_API "Ignore auto-detection and force use of pthread API" OFF)
 option(LIBCXX_HAS_WIN32_THREAD_API "Ignore auto-detection and force use of win32 thread API" OFF)