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improvements to zig's implementation of libc and WebAssembly

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* rename std/special/builtin.zig to std/special/c.zig
   not to be confused with @import("builtin") which is entirely
   different, this is zig's multi-target libc implementation.
 * WebAssembly: build-exe is for executables which have a main().
   build-lib is for building libraries of functions to use from,
   for example, a web browser environment.
   - for now pass --export-all for libraries when there are any
     C objects because we have no way to detect the list of exports
     when compiling C code.
   - stop passing --no-entry for executables. if you want --no-entry
     then use build-lib.
 * make the "musl" ABI the default ABI for wasm32-freestanding.
 * zig provides libc for wasm32-freestanding-musl.
This commit is contained in:
Andrew Kelley
2019-05-15 16:20:16 -04:00
parent 3aa43dc31c
commit 14cdb01f35
4 changed files with 48 additions and 26 deletions
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7
src/target.cpp
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@@ -1376,6 +1376,9 @@ bool target_is_single_threaded(const ZigTarget *target) {
}
ZigLLVM_EnvironmentType target_default_abi(ZigLLVM_ArchType arch, Os os) {
if (arch == ZigLLVM_wasm32 || arch == ZigLLVM_wasm64) {
return ZigLLVM_Musl;
}
switch (os) {
case OsFreestanding:
case OsAnanas:
@@ -1490,6 +1493,7 @@ static const AvailableLibC libcs_available[] = {
{ZigLLVM_systemz, OsLinux, ZigLLVM_Musl},
{ZigLLVM_sparc, OsLinux, ZigLLVM_GNU},
{ZigLLVM_sparcv9, OsLinux, ZigLLVM_GNU},
{ZigLLVM_wasm32, OsFreestanding, ZigLLVM_Musl},
{ZigLLVM_x86_64, OsLinux, ZigLLVM_GNU},
{ZigLLVM_x86_64, OsLinux, ZigLLVM_GNUX32},
{ZigLLVM_x86_64, OsLinux, ZigLLVM_Musl},
@@ -1508,7 +1512,6 @@ bool target_can_build_libc(const ZigTarget *target) {
}
const char *target_libc_generic_name(const ZigTarget *target) {
assert(target->os == OsLinux);
switch (target->abi) {
case ZigLLVM_GNU:
case ZigLLVM_GNUABIN32:
@@ -1520,6 +1523,7 @@ const char *target_libc_generic_name(const ZigTarget *target) {
case ZigLLVM_Musl:
case ZigLLVM_MuslEABI:
case ZigLLVM_MuslEABIHF:
case ZigLLVM_UnknownEnvironment:
return "musl";
case ZigLLVM_CODE16:
case ZigLLVM_EABI:
@@ -1530,7 +1534,6 @@ const char *target_libc_generic_name(const ZigTarget *target) {
case ZigLLVM_Cygnus:
case ZigLLVM_CoreCLR:
case ZigLLVM_Simulator:
case ZigLLVM_UnknownEnvironment:
zig_unreachable();
}
zig_unreachable();