misc: Replace libgcc with cc-runtime

meson.build

@@ -30,7 +30,6 @@ no_headers = get_option('no_headers')
 library_type = get_option('default_library')
 build_tests = get_option('build_tests')
 build_tests_host_libc = get_option('build_tests_host_libc')
-libgcc_dependency = get_option('libgcc_dependency')
 internal_conf = configuration_data()
 mlibc_conf = configuration_data()
 
@@ -413,27 +412,18 @@ subdir('options/bsd')
 
 rtlib_deps = []
 
-if not headers_only
-	if libgcc_dependency
-		libgcc = meson.get_compiler('c').find_library('gcc', required: false)
-
-		compiler_rt_name = 'libclang_rt.builtins-' + host_machine.cpu_family()
-		compiler_rt = meson.get_compiler('c').find_library(compiler_rt_name, required: false)
-
-		if not compiler_rt.found()
-			compiler_rt_name = 'libclang_rt.builtins'
-			compiler_rt = meson.get_compiler('c').find_library(compiler_rt_name, required: false)
-		endif
-
-		if libgcc.found()
-			rtlib_deps += libgcc
-		elif compiler_rt.found()
-			rtlib_deps += compiler_rt
-		else
-			error('neither libgcc nor ' + compiler_rt_name + ' was found')
-		endif
-	endif
+ccrt = static_library(
+	'ccrt',
+	dependencies: [ccrt_dep],
+	c_args: [
+		'-fvisibility=hidden',
+		'-ffunction-sections',
+		'-fdata-sections',
+	],
+	override_options: ['c_std=c11'],
+)
 
+if not headers_only
 	ld_cpp_args = [
 		'-fvisibility=hidden',
 		'-fvisibility-inlines-hidden',
@@ -471,13 +461,14 @@ if not headers_only
 			cpp_args: ld_cpp_args + static_cpp_args,
 			include_directories: rtld_include_dirs,
 			dependencies: rtld_deps + rtlib_deps,
+			link_with: [ccrt],
 			install: false
 		)
 		libc_static = static_library('c', libc_all_sources,
 			cpp_args: static_cpp_args + ['-fno-stack-protector', libc_cpp_args],
 			include_directories: libc_include_dirs,
 			dependencies: libc_deps + rtlib_deps,
-			link_with: [ld_static_lib],
+			link_with: [ccrt, ld_static_lib],
 			link_whole: [libc_sublibs, ld_static_lib],
 			install: true
 		)
@@ -488,6 +479,7 @@ if not headers_only
 			cpp_args: ld_cpp_args,
 			include_directories: rtld_include_dirs,
 			dependencies: rtld_deps + rtlib_deps,
+			link_with: [ccrt],
 			install: true
 		)
 		hide_everything_ld = (meson.current_source_dir()
@@ -496,7 +488,7 @@ if not headers_only
 			cpp_args: [libc_cpp_args],
 			include_directories: libc_include_dirs,
 			dependencies: libc_deps + rtlib_deps,
-			link_with: [ld_shared_lib],
+			link_with: [ccrt, ld_shared_lib],
 			link_whole: libc_sublibs,
 			link_args: ['-Wl,--version-script,' + hide_everything_ld],
 			link_depends: [hide_everything_ld],
@@ -526,7 +518,6 @@ summary_info += {'Linux option': get_option('linux_option')}
 summary_info += {'glibc option': get_option('glibc_option')}
 summary_info += {'BSD option': get_option('bsd_option')}
 summary_info += {'debug allocator': get_option('debug_allocator')}
-summary_info += {'libgcc dependency': libgcc_dependency}
 summary(summary_info, bool_yn: true, section: 'mlibc options')
 
 if build_tests

meson_options.txt

@@ -6,7 +6,6 @@ option('posix_option', type: 'feature', value : 'auto')
 option('linux_option', type: 'feature', value : 'auto')
 option('glibc_option', type: 'feature', value : 'auto')
 option('bsd_option', type: 'feature', value : 'auto')
-option('libgcc_dependency', type : 'boolean', value : true)
 option('linux_kernel_headers', type: 'string', value : '')
 option('default_library_paths', type: 'array', value: [])
 option('debug_allocator', type : 'boolean', value : false,

subprojects/cc-runtime.wrap

@@ -0,0 +1,4 @@
+[wrap-git]
+directory = cc-runtime
+url = https://github.com/osdev0/cc-runtime.git
+revision = trunk