4 files changed, 61 insertions, 0 deletions
diff --git a/test cases/unit/77 nostdlib/subprojects/mylibc/libc.c b/test cases/unit/77 nostdlib/subprojects/mylibc/libc.c
new file mode 100644
index 0000000..67261cb
--- /dev/null
+++ b/test cases/unit/77 nostdlib/subprojects/mylibc/libc.c
@@ -0,0 +1,35 @@
+/* Do not use this as the basis of your own libc.
+ * The code is probably unoptimal or wonky, as I
+ * had no prior experience with this, but instead
+ * just fiddled with the code until it worked.
+ */
+
+#include<stdio.h>
+
+#define STDOUT 1
+#define SYS_WRITE 4
+
+int simple_print(const char *msg, const long bufsize) {
+  int count;
+  long total_written = 0;
+  while(total_written < bufsize) {
+    asm(
+        "int $0x80\n\t"
+        : "=a"(count)
+        : "0"(SYS_WRITE), "b"(STDOUT), "c"(msg+total_written), "d"(bufsize-total_written)
+        :);
+    if(count == 0) {
+      return 1;
+    }
+    total_written += count;
+  }
+  return 0;
+}
+
+int simple_strlen(const char *str) {
+  int len = 0;
+  while(str[len] != '\0') {
+    len++;
+  }
+  return len;
+}
diff --git a/test cases/unit/77 nostdlib/subprojects/mylibc/meson.build b/test cases/unit/77 nostdlib/subprojects/mylibc/meson.build
new file mode 100644
index 0000000..ff4bdb2
--- /dev/null
+++ b/test cases/unit/77 nostdlib/subprojects/mylibc/meson.build
@@ -0,0 +1,13 @@
+project('own libc', 'c')
+
+# A very simple libc implementation
+
+# Do not specify -nostdlib & co. They come from cross specifications.
+
+libc = static_library('c', 'libc.c', 'stubstart.s')
+
+mylibc_dep = declare_dependency(link_with : libc,
+  include_directories : include_directories('.')
+)
+
+meson.override_dependency('c_stdlib', mylibc_dep)
diff --git a/test cases/unit/77 nostdlib/subprojects/mylibc/stdio.h b/test cases/unit/77 nostdlib/subprojects/mylibc/stdio.h
new file mode 100644
index 0000000..c3f8f56
--- /dev/null
+++ b/test cases/unit/77 nostdlib/subprojects/mylibc/stdio.h
@@ -0,0 +1,5 @@
+#pragma once
+
+int simple_print(const char *msg, const long bufsize);
+
+int simple_strlen(const char *str);
diff --git a/test cases/unit/77 nostdlib/subprojects/mylibc/stubstart.s b/test cases/unit/77 nostdlib/subprojects/mylibc/stubstart.s
new file mode 100644
index 0000000..0a6d972
--- /dev/null
+++ b/test cases/unit/77 nostdlib/subprojects/mylibc/stubstart.s
@@ -0,0 +1,8 @@
+.globl _start
+
+_start:
+
+    call main
+    movl %eax, %ebx
+    movl $1, %eax
+    int $0x80