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linux: fix musl compatibility (non-glibc systems) #56

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1918ac8
linux: fix musl compatibility (non-glibc systems)
Feb 24, 2026
5b44834
Use realpath and static memory buffers instead of alloca
Jack-Punter Feb 26, 2026
8014c2f
Update base types context cracking based on Allen's more recent veris…
Jack-Punter Feb 26, 2026
881bce6
Oops if forgot to copy the string to the arena
Feb 27, 2026
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189 changes: 116 additions & 73 deletions code/custom/4coder_base_types.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,128 +8,171 @@
#define FCODER_BASE_TYPES

////////////////////////////////

#if defined(_MSC_VER)

# define COMPILER_CL 1

# if defined(_WIN32)
# define OS_WINDOWS 1
# else
# error This compiler/platform combo is not supported yet
# error missing OS detection
# endif

# if defined(_M_AMD64)
# define ARCH_X64 1
# elif defined(_M_IX86)
# elif defined(_M_I86)
# define ARCH_X86 1
# elif defined(_M_ARM64)
# define ARCH_ARM64 1
# elif defined(_M_ARM)
# define ARCH_ARM32 1
# else
# error architecture not supported yet
# error missing ARCH detection
# endif

#elif defined(__clang__)

# define COMPILER_CLANG 1
#elif defined(__clang__) || defined(__GNUC__)
# if defined(__clang__)
# define COMPILER_CLANG 1
# elif defined(__GNUC__)
# define COMPILER_GCC 1
# endif

# if defined(__APPLE__) && defined(__MACH__)
# if defined(_WIN32)
# define OS_WINDOWS 1
# elif defined(__gnu_linux__) || defined(__linux__)
# define OS_LINUX 1
# elif defined(__APPLE__) && defined(__MACH__)
# define OS_MAC 1
# else
# error This compiler/platform combo is not supported yet
# error missing OS detection
# endif

# if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64)
# if defined(__amd64__)
# define ARCH_X64 1
# elif defined(i386) || defined(__i386) || defined(__i386__)
# elif defined(__i386__)
# define ARCH_X86 1
# elif defined(__aarch64__)
# define ARCH_ARM64 1
# elif defined(__arm__)
# define ARCH_ARM32 1
# else
# error architecture not supported yet
# endif

#elif defined(__GNUC__) || defined(__GNUG__)

# define COMPILER_GCC 1

# if defined(__gnu_linux__)
# define OS_LINUX 1
# else
# error This compiler/platform combo is not supported yet
# endif

# if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64)
# define ARCH_X64 1
# elif defined(i386) || defined(__i386) || defined(__i386__)
# define ARCH_X86 1
# elif defined(__aarch64__)
# define ARCH_ARM64 1
# elif defined(__arm__)
# define ARCH_ARM32 1
# else
# error architecture not supported yet
# error missing ARCH detection
# endif

#else
# error This compiler is not supported yet
# error no context cracking for this compiler
#endif

#if defined(ARCH_X64)
# define ARCH_64BIT 1
#elif defined(ARCH_X86)
# define ARCH_32BIT 1

#if !defined(COMPILER_CL)
# define COMPILER_CL 0
#endif

// zeroify

#if !defined(ARCH_32BIT)
#define ARCH_32BIT 0
#if !defined(COMPILER_CLANG)
# define COMPILER_CLANG 0
#endif
#if !defined(COMPILER_GCC)
# define COMPILER_GCC 0
#endif
#if !defined(OS_WINDOWS)
# define OS_WINDOWS 0
#endif
#if !defined(OS_LINUX)
# define OS_LINUX 0
#endif
#if !defined(ARCH_64BIT)
#define ARCH_64BIT 0
#if !defined(OS_MAC)
# define OS_MAC 0
#endif
#if !defined(ARCH_X64)
#define ARCH_X64 0
# define ARCH_X64 0
#endif
#if !defined(ARCH_X86)
#define ARCH_X86 0
# define ARCH_X86 0
#endif
#if !defined(ARCH_ARM32)
# define ARCH_ARM32 0
#endif
#if !defined(ARCH_ARM64)
#define ARCH_ARM64 0
# define ARCH_ARM64 0
#endif
#if !defined(ARCH_ARM32)
#define ARCH_ARM32 0

// language
#if defined(__cplusplus)
# define LANG_CXX 1
#else
# define LANG_C 1
#endif
#if !defined(COMPILER_CL)
#define COMPILER_CL 0

#if !defined(LANG_CXX)
# define LANG_CXX 0
#endif
#if !defined(COMPILER_GCC)
#define COMPILER_GCC 0
#if !defined(LANG_C)
# define LANG_C 0
#endif
#if !defined(COMPILER_CLANG)
#define COMPILER_CLANG 0

// language version: C
#if LANG_C
# if !defined(__STDC_VERSION__)
# define LANGVER_C90 1
# elif (__STDC_VERSION__ == 199901)
# define LANGVER_C99 1
# elif (__STDC_VERSION__ == 201112)
# define LANGVER_C11 1
# elif (__STDC_VERSION__ == 201710)
# define LANGVER_C17 1
# elif (__STDC_VERSION__ == 202000)
# define LANGVER_C23 1
# else
# error unrecorgnized C version
# endif
#endif
#if !defined(OS_WINDOWS)
#define OS_WINDOWS 0

#if !defined(LANGVER_C90)
# define LANGVER_C90 0
#endif
#if !defined(OS_LINUX)
#define OS_LINUX 0
#if !defined(LANGVER_C99)
# define LANGVER_C99 0
#endif
#if !defined(OS_MAC)
#define OS_MAC 0
#if !defined(LANGVER_C11)
# define LANGVER_C11 0
#endif
#if !defined(LANGVER_C17)
# define LANGVER_C17 0
#endif
#if !defined(LANGVER_C23)
# define LANGVER_C23 0
#endif

#if !defined(SHIP_MODE)
#define SHIP_MODE 0
#else
#undef SHIP_MODE
#define SHIP_MODE 1
// language version: C++
#if LANG_CXX
# if (__cplusplus == 199711)
# define LANGVER_CXX98 1
# elif (__cplusplus == 201103)
# define LANGVER_CXX11 1
# elif (__cplusplus == 201402)
# define LANGVER_CXX14 1
# elif (__cplusplus == 201703)
# define LANGVER_CXX17 1
# elif (__cplusplus == 202002)
# define LANGVER_CXX20 1
# elif (__cplusplus == 202302)
# define LANGVER_CXX23 1
# else
# error unrecorgnized C++ version
# endif
#endif

#if !defined(LANGVER_CXX98)
# define LANGVER_CXX98 0
#endif
#if !defined(LANGVER_CXX11)
# define LANGVER_CXX11 0
#endif
#if !defined(LANGVER_CXX14)
# define LANGVER_CXX14 0
#endif
#if !defined(LANGVER_CXX17)
# define LANGVER_CXX17 0
#endif
#if !defined(LANGVER_CXX20)
# define LANGVER_CXX20 0
#endif
#if !defined(LANGVER_CXX23)
# define LANGVER_CXX23 0
#endif

// names
Expand Down
71 changes: 21 additions & 50 deletions code/platform_linux/linux_4ed_functions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -64,67 +64,37 @@ system_get_path(Arena* arena, System_Path_Code path_code){

internal String_Const_u8
system_get_canonical(Arena* arena, String_Const_u8 name){
Assert(name.size < PATH_MAX - 1);
char tmp[PATH_MAX] = { 0 };
strncpy(tmp, (const char *)name.str, name.size);

char real[PATH_MAX] = { 0 };
realpath(tmp, real);

// first remove redundant ../, //, ./ parts

const u8* input = (u8*) strndupa((char*)name.str, name.size);
u8* output = push_array(arena, u8, name.size + 1);

const u8* p = input;
u8* q = output;

while(*p) {

// not a slash - copy char
if(p[0] != '/') {
*q++ = *p++;
continue;
}

// two slashes in a row, skip one.
if(p[1] == '/') {
++p;
}
else if(p[1] == '.') {

// skip "/./" or trailing "/."
if(p[2] == '/' || p[2] == '\0') {
p += 2;
}

// if we encounter "/../" or trailing "/..", remove last directory instead
else if(p[2] == '.' && (p[3] == '/' || p[3] == '\0')) {
while(q > output && *--q != '/'){};
p += 3;
}

else {
*q++ = *p++;
}
}
else {
*q++ = *p++;
}
}

String_Const_u8 result = push_string_copy(arena,
SCu8((u8*)real, cstring_length(real)));
#ifdef INSO_DEBUG
if(name.size != q - output) {
LINUX_FN_DEBUG("[%.*s] -> [%.*s]", (int)name.size, name.str, (int)(q - output), output);
if(name.size != result.size) {
LINUX_FN_DEBUG("[%.*s] -> [%.*s]",
(int)name.size, name.str,
(int)result.size, result.str);
}
#endif

// TODO: use realpath at this point to resolve symlinks?
return SCu8(output, q - output);
return result;
}

internal File_List
system_get_file_list(Arena* arena, String_Const_u8 directory){
Assert(directory.size < PATH_MAX - 1);
//LINUX_FN_DEBUG("%.*s", (int)directory.size, directory.str);
File_List result = {};

char* path = strndupa((char*)directory.str, directory.size);
char path[PATH_MAX] = { 0 };
strncpy(path, (const char *)directory.str, directory.size);

int fd = open(path, O_RDONLY | O_DIRECTORY);
if(fd == -1) {
LINUX_FN_DEBUG("Failed to open directory: %.*s", (int)directory.size, directory.str);
perror("open");
return result;
}
Expand Down Expand Up @@ -168,7 +138,7 @@ system_get_file_list(Arena* arena, String_Const_u8 directory){
*fip++ = f;
}

qsort(result.infos, result.count, sizeof(File_Info*), (__compar_fn_t)&linux_compare_file_infos);
qsort(result.infos, result.count, sizeof(File_Info*), (int(*)(const void*, const void*))&linux_compare_file_infos);

for(u32 i = 0; i < result.count - 1; ++i) {
result.infos[i]->next = result.infos[i+1];
Expand Down Expand Up @@ -252,6 +222,7 @@ system_save_file(Arena* scratch, char* file_name, String_Const_u8 data){
}
close(fd);
} else {
LINUX_FN_DEBUG("Failed to open file: %s", file_name);
perror("open");
}

Expand Down Expand Up @@ -334,7 +305,7 @@ function
system_universal_date_time_from_local_sig(){
struct tm local_tm = {};
linux_tm_from_date_time(&local_tm, date_time);
time_t loc_time = timelocal(&local_tm);
time_t loc_time = mktime(&local_tm);
struct tm *utc_tm = gmtime(&loc_time);
Date_Time result = {};
linux_date_time_from_tm(&result, utc_tm);
Expand Down