misc: Depend on 'cshim', if available, instead of host freestanding headers

meson.build

@@ -43,6 +43,12 @@ internal_conf = configuration_data()
 mlibc_conf = configuration_data()
 
 if not headers_only
+	cshim_dep = dependency('cshim',
+				required: false,
+				fallback: ['cshim', 'cshim_dep'])
+	libc_deps += cshim_dep
+	rtdl_deps += cshim_dep
+
 	cxxshim_dep = dependency('cxxshim',
 				 required: false,
 				 fallback: ['cxxshim', 'cxxshim_dep'])
@@ -62,40 +68,42 @@ if not headers_only
 	cpp_compiler = meson.get_compiler('cpp')
 
 	add_project_arguments('-Wno-unused-function', '-D__MLIBC_BUILDING_MLIBC', language: ['c', 'cpp'])
-	add_project_arguments('-nostdinc', '-fno-builtin', language: ['c', 'cpp'])
+	add_project_arguments('-nostdinc', '-fno-builtin', '-ffreestanding', language: ['c', 'cpp'])
 	add_project_arguments('-Werror=misleading-indentation', language: ['c', 'cpp'])
 	add_project_arguments('-fno-rtti', '-fno-exceptions', language: 'cpp')
 	add_project_link_arguments('-nostdlib', language: ['c', 'cpp'])
 
-	searchdirs = run_command(c_compiler.cmd_array(), '-print-search-dirs',
-				check: true).stdout()
-	searchdirs_arr = searchdirs.split('\n')
-	searchline = 'install: '
-	ccdir = ''
-	if c_compiler.get_id() == 'clang'
-		searchline = 'libraries: ='
-	endif
+	if not cshim_dep.found()
+		searchdirs = run_command(c_compiler.cmd_array(), '-print-search-dirs',
+					check: true).stdout()
+		searchdirs_arr = searchdirs.split('\n')
+		searchline = 'install: '
+		ccdir = ''
+		if c_compiler.get_id() == 'clang'
+			searchline = 'libraries: ='
+		endif
 
-	foreach line : searchdirs_arr
-		if line.startswith(searchline)
-			ccdir = line.strip(searchline)
-			ccdir = ccdir.split(':')[0]
-			break
+		foreach line : searchdirs_arr
+			if line.startswith(searchline)
+				ccdir = line.strip(searchline)
+				ccdir = ccdir.split(':')[0]
+				break
+			endif
+		endforeach
+
+		if ccdir == ''
+			error('could not find compiler-specific header directory')
 		endif
-	endforeach
 
-	if ccdir == ''
-		error('could not find compiler-specific header directory')
-	endif
+		if c_compiler.get_id() == 'gcc' and fs.exists(ccdir / 'include-fixed')
+			rtdl_include_dirs += include_directories(ccdir / 'include-fixed')
+			libc_include_dirs += include_directories(ccdir / 'include-fixed')
+		endif
 
-	if c_compiler.get_id() == 'gcc' and fs.exists(ccdir / 'include-fixed')
-		rtdl_include_dirs += include_directories(ccdir / 'include-fixed')
-		libc_include_dirs += include_directories(ccdir / 'include-fixed')
+		rtdl_include_dirs += include_directories(ccdir / 'include')
+		libc_include_dirs += include_directories(ccdir / 'include')
 	endif
 
-	rtdl_include_dirs += include_directories(ccdir / 'include')
-	libc_include_dirs += include_directories(ccdir / 'include')
-
 	if not cxxshim_dep.found()
 		cplusplus_include_path = []
 

options/ansi/include/limits.h

@@ -3,6 +3,10 @@
 
 #define CHAR_BIT 8
 
+#ifndef MB_LEN_MAX
+# define MB_LEN_MAX 4
+#endif
+
 #ifdef LONG_MAX
 # ifdef LONG_MAX == INT32_MAX
 #  define LONG_BIT 32
@@ -21,17 +25,60 @@
 # error "Unsupported configuration, please define either LONG_MAX or __LONG_MAX__"
 #endif
 
+#undef SCHAR_MIN
+#undef SCHAR_MAX
+#undef CHAR_MIN
+#undef CHAR_MAX
+#undef UCHAR_MAX
+#undef SHRT_MIN
+#undef SHRT_MAX
+#undef USHRT_MAX
 #undef INT_MIN
 #undef INT_MAX
 #undef UINT_MAX
+#undef LONG_MIN
+#undef LONG_MAX
+#undef ULONG_MAX
 #undef LLONG_MIN
 #undef LLONG_MAX
 #undef ULLONG_MAX
 
+#define SCHAR_MIN (-__SCHAR_MAX__ - 1)
+#define SCHAR_MAX __SCHAR_MAX__
+#if __SCHAR_MAX__ == __INT_MAX__
+# define UCHAR_MAX (__SCHAR_MAX__ * 2U + 1U)
+#else
+# define UCHAR_MAX (__SCHAR_MAX__ * 2 + 1)
+#endif
+
+#ifdef __CHAR_UNSIGNED__
+# define CHAR_MAX UCHAR_MAX
+# if __SCHAR_MAX__ == __INT_MAX__
+#  define CHAR_MIN 0U
+# else
+#  define CHAR_MIN 0
+# endif
+#else
+# define CHAR_MAX SCHAR_MAX
+# define CHAR_MIN SCHAR_MIN
+#endif
+
+#define SHRT_MIN (-__SHRT_MAX__ - 1)
+#define SHRT_MAX __SHRT_MAX__
+#if __SHRT_MAX_ == __INT_MAX__
+# define USHRT_MAX (__SHRT_MAX__ * 2U + 1U)
+#else
+# define USHRT_MAX (__SHRT_MAX__ * 2 + 1)
+#endif
+
 #define INT_MIN (-__INT_MAX__ - 1)
 #define INT_MAX __INT_MAX__
 #define UINT_MAX (__INT_MAX__ * 2 + 1)
 
+#define LONG_MIN (-__LONG_MAX__ - 1L)
+#define LONG_MAX __LONG_MAX__
+#define ULONG_MAX (__LONG_MAX__ * 2UL + 1UL)
+
 #define LLONG_MIN (-__LONG_LONG_MAX__ - 1LL)
 #define LLONG_MAX __LONG_LONG_MAX__
 #define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1ULL)

options/ansi/meson.build

@@ -321,5 +321,6 @@ if not headers_only
 		'musl-generic-math/truncl.c',
 		pic: true,
 		include_directories: libc_include_dirs,
+		dependencies: libc_deps,
 		c_args: ['-Wno-unused', '-Wno-implicit', '-Wno-parentheses', '-Wno-sign-compare', '-Wno-attributes', '-Wno-unknown-pragmas', '-Wno-maybe-uninitialized'])
 endif

options/posix/meson.build

@@ -68,6 +68,7 @@ if not headers_only
 		'musl-generic-regex/tre-mem.c',
 		pic: true,
 		include_directories: libc_include_dirs,
+		dependencies: libc_deps,
 		c_args: ['-Wno-unused', '-Wno-implicit', '-Wno-parentheses', '-Wno-sign-compare', '-Wno-attributes', '-Wno-unknown-pragmas', '-Wno-implicit-fallthrough']
 	)
 endif

subprojects/cshim.wrap

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

tests/meson.build

@@ -202,7 +202,7 @@ foreach test_name : all_test_cases
 	should_fail = fail_test_cases.contains(test_name)
 	exec = executable(test_exec_name, [test_name + '.c', test_sources],
 		link_with: libc, include_directories: libc_include_dirs,
-		dependencies: rtlib_deps,
+		dependencies: rtdl_deps + rtlib_deps,
 		build_rpath: meson.build_root(),
 		override_options: test_override_options,
 		c_args: test_c_args,

tests/rtdl/meson.build

@@ -31,7 +31,7 @@ foreach test_name : rtdl_test_cases
 
 	exec = executable('rtdl-' + test_name, [test_name / 'test.c', test_sources],
 		link_with: test_link_with + libc, include_directories: libc_include_dirs,
-		dependencies: rtlib_deps,
+		dependencies: rtdl_deps + rtlib_deps,
 		build_rpath: test_rpath,
 		override_options: test_override_options,
 		c_args: test_c_args,