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build(CMake): Require C99 mode 

Specify language requirement as a [compile-feature] and force compiler
extensions off ensuring portability problems are detected early on.
Note that we do not use the `C_STANDARD` property, because it doesn't
propagate to dependent targets and would prohibit users from compiling
their code base with consistent flags / language configuations if they
were to target a newer C standard. Similarly we do not configure
`C_STANDARD_REQUIRED` as [compile-features] do not interact with
it--they are enforced regardless.

[compile-feature]: https://cmake.org/cmake/help/latest/manual/cmake-compile-features.7.html#compile-feature-requirements
This commit is contained in:
Henrik S. Gaßmann 2023-12-02 15:19:30 +01:00
parent 92e4cd71be
commit 1c0c66816b
1 changed files with 13 additions and 1 deletions
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14
c/CMakeLists.txt
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@ -1,4 +1,9 @@
cmake_minimum_required(VERSION 3.9)
cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
# respect C_EXTENSIONS OFF without explicitly setting C_STANDARD
if (POLICY CMP0128)
cmake_policy(SET CMP0128 NEW)
endif()
project(libblake3
VERSION 1.5.0
@ -61,7 +66,14 @@ set_target_properties(blake3 PROPERTIES
VERSION ${PROJECT_VERSION}
SOVERSION 0
C_VISIBILITY_PRESET hidden
C_EXTENSIONS OFF
)
target_compile_features(blake3 PUBLIC c_std_99)
# ensure C_EXTENSIONS OFF is respected without overriding CMAKE_C_STANDARD
# which may be set by the user or toolchain file
if (NOT POLICY CMP0128 AND NOT DEFINED CMAKE_C_STANDARD)
set_target_properties(blake3 PROPERTIES C_STANDARD 99)
endif()
# optional SIMD sources
macro(BLAKE3_DISABLE_SIMD)