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Add fallback for missing stdbit.h #49

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Add fallback for missing stdbit.h #49

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9 changes: 9 additions & 0 deletions src/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ project(libxm LANGUAGES C)
set(CMAKE_C_STANDARD 23)
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)

include(CheckIncludeFile)

add_library(xm_common INTERFACE)
if(CMAKE_C_COMPILER_ID MATCHES "^(GNU|Clang)$")
target_compile_options(xm_common INTERFACE
Expand All @@ -29,6 +31,13 @@ find_library(MATH_LIBRARY m REQUIRED)
target_include_directories(xm SYSTEM PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
target_link_libraries(xm PRIVATE xm_common ${MATH_LIBRARY})

# Check if stdbit.h is available
check_include_file(stdbit.h HAVE_STDBIT_H)

if (NOT HAVE_STDBIT_H)
target_include_directories(xm SYSTEM PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/compat)
endif()

function(option_and_define name description default_value)
option(${name} ${description} ${default_value})
if(${name})
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14 changes: 14 additions & 0 deletions src/compat/stdbit.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
/* Author: danct12 <danct12@demodiv.danctnix.org> */

/* This program is free software. It comes without any warranty, to the
* extent permitted by applicable law. You can redistribute it and/or
* modify it under the terms of the Do What The Fuck You Want To Public
* License, Version 2, as published by Sam Hocevar. See
* http://sam.zoy.org/wtfpl/COPYING for more details. */

#ifndef __FALLBACK_STDBIT_H__
#define __FALLBACK_STDBIT_H__

#define stdc_count_ones __builtin_stdc_count_ones

#endif /* __FALLBACK_STDBIT_H__ */