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tinygo/builder/picolibc.go

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all: include picolibc for bare metal targets This is necessary for better CGo support on bare metal. Existing libraries expect to be able to include parts of libc and expect to be able to link to those symbols. Because with this all targets have a working libc, it is now possible to add tests to check that a libc in fact works basically. Not all parts of picolibc are included, such as the math or stdio parts. These should be added later, when needed. This commit also avoids the need for the custom memcpy/memset/memcmp symbols that are sometimes emitted by LLVM. The C library will take care of that.
5 years ago
package builder
import (
"path/filepath"
"github.com/tinygo-org/tinygo/goenv"
)
// Picolibc is a C library for bare metal embedded devices. It was originally
// based on newlib.
var Picolibc = Library{
name: "picolibc",
cflags: func() []string {
picolibcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib/libc")
builder: fix picolibc include path Previously we used --sysroot to set the sysroot explicitly. Unfortunately, this flag is not used directly by Clang to set the include path (<sysroot>/include) but is instead interpreted by the toolchain code. This means that even when the toolchain is explicitly set (using the --sysroot parameter), it may still decide to use a different include path such as <sysroot>/usr/include (such as on baremetal aarch64). This commit uses the Clang-internal -internal-isystem flag which sets the include directory directly (as a system include path). This should be more robust. The reason the --sysroot parameter has so far worked is that all existing targets happened to add <sysroot>/include as an include path. The relevant Clang code is here: https://github.com/llvm/llvm-project/blob/release/9.x/clang/lib/Driver/Driver.cpp#L4693-L4739 So far, RISC-V is handled by RISCVToolchain, Cortex-M targets by BareMetal (which seems to be specific to ARM unlike what the name says) and aarch64 fell back to Generic_ELF.
5 years ago
return []string{"-Werror", "-Wall", "-std=gnu11", "-D_COMPILING_NEWLIB", "-nostdlibinc", "-Xclang", "-internal-isystem", "-Xclang", picolibcDir + "/include", "-I" + picolibcDir + "/tinystdio", "-I" + goenv.Get("TINYGOROOT") + "/lib/picolibc-include"}
all: include picolibc for bare metal targets This is necessary for better CGo support on bare metal. Existing libraries expect to be able to include parts of libc and expect to be able to link to those symbols. Because with this all targets have a working libc, it is now possible to add tests to check that a libc in fact works basically. Not all parts of picolibc are included, such as the math or stdio parts. These should be added later, when needed. This commit also avoids the need for the custom memcpy/memset/memcmp symbols that are sometimes emitted by LLVM. The C library will take care of that.
5 years ago
},
sourceDir: "lib/picolibc/newlib/libc",
sources: func(target string) []string {
return picolibcSources
},
}
var picolibcSources = []string{
"string/bcmp.c",
"string/bcopy.c",
"string/bzero.c",
"string/explicit_bzero.c",
"string/ffsl.c",
"string/ffsll.c",
"string/fls.c",
"string/flsl.c",
"string/flsll.c",
"string/gnu_basename.c",
"string/index.c",
"string/memccpy.c",
"string/memchr.c",
"string/memcmp.c",
"string/memcpy.c",
"string/memmem.c",
"string/memmove.c",
"string/mempcpy.c",
"string/memrchr.c",
"string/memset.c",
"string/rawmemchr.c",
"string/rindex.c",
"string/stpcpy.c",
"string/stpncpy.c",
"string/strcasecmp.c",
"string/strcasecmp_l.c",
"string/strcasestr.c",
"string/strcat.c",
"string/strchr.c",
"string/strchrnul.c",
"string/strcmp.c",
"string/strcoll.c",
"string/strcoll_l.c",
"string/strcpy.c",
"string/strcspn.c",
"string/strdup.c",
"string/strerror.c",
"string/strerror_r.c",
"string/strlcat.c",
"string/strlcpy.c",
"string/strlen.c",
"string/strlwr.c",
"string/strncasecmp.c",
"string/strncasecmp_l.c",
"string/strncat.c",
"string/strncmp.c",
"string/strncpy.c",
"string/strndup.c",
"string/strnlen.c",
"string/strnstr.c",
"string/strpbrk.c",
"string/strrchr.c",
"string/strsep.c",
"string/strsignal.c",
"string/strspn.c",
"string/strstr.c",
"string/strtok.c",
"string/strtok_r.c",
"string/strupr.c",
"string/strverscmp.c",
"string/strxfrm.c",
"string/strxfrm_l.c",
"string/swab.c",
"string/timingsafe_bcmp.c",
"string/timingsafe_memcmp.c",
"string/u_strerr.c",
"string/wcpcpy.c",
"string/wcpncpy.c",
"string/wcscasecmp.c",
"string/wcscasecmp_l.c",
"string/wcscat.c",
"string/wcschr.c",
"string/wcscmp.c",
"string/wcscoll.c",
"string/wcscoll_l.c",
"string/wcscpy.c",
"string/wcscspn.c",
"string/wcsdup.c",
"string/wcslcat.c",
"string/wcslcpy.c",
"string/wcslen.c",
"string/wcsncasecmp.c",
"string/wcsncasecmp_l.c",
"string/wcsncat.c",
"string/wcsncmp.c",
"string/wcsncpy.c",
"string/wcsnlen.c",
"string/wcspbrk.c",
"string/wcsrchr.c",
"string/wcsspn.c",
"string/wcsstr.c",
"string/wcstok.c",
"string/wcswidth.c",
"string/wcsxfrm.c",
"string/wcsxfrm_l.c",
"string/wcwidth.c",
"string/wmemchr.c",
"string/wmemcmp.c",
"string/wmemcpy.c",
"string/wmemmove.c",
"string/wmempcpy.c",
"string/wmemset.c",
"string/xpg_strerror_r.c",
}