[libc-commits] [libc] libc: Introduce calls to sysconf to get page size. (PR #163462)

[Michael Jones via libc-commits]

michaelrj-google wrote:

Here's the diff to fix the bazel files:
```
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index 936bc1248b6e..c7e3aa692b1f 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -1501,6 +1501,21 @@ libc_support_library(
     ],
 )
 
+libc_support_library(
+    name = "__support_osutil_linux_auxv",
+    hdrs = ["src/__support/OSUtil/linux/auxv.h"],
+    target_compatible_with = select({
+        "@platforms//os:linux": [],
+        "//conditions:default": ["@platforms//:incompatible"],
+    }),
+    deps = [
+        ":__support_common",
+        ":__support_osutil_syscall",
+        ":__support_threads_callonce",
+        ":hdr_fcntl_macros",
+    ],
+)
+
 libc_support_library(
     name = "__support_osutil_vdso",
     hdrs = [
@@ -6336,6 +6351,19 @@ libc_function(
     ],
 )
 
+# WARNING: NOT FULLY IMPLEMENTED, FOR TESTING USE ONLY
+libc_function(
+    name = "sysconf",
+    srcs = ["src/unistd/linux/sysconf.cpp"],
+    hdrs = ["src/unistd/sysconf.h"],
+    deps = [
+        ":__support_common",
+        ":__support_osutil_linux_auxv",
+        ":errno",
+        ":hdr_unistd_macros",
+    ],
+)
+
 libc_function(
     name = "write",
     srcs = ["src/unistd/linux/write.cpp"],
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/sys/mman/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/sys/mman/BUILD.bazel
index e2c7f7a8bf60..6de76e2357b7 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/sys/mman/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/sys/mman/BUILD.bazel
@@ -30,6 +30,7 @@ libc_test(
         "//libc:mmap",
         "//libc:munlock",
         "//libc:munmap",
+        "//libc:sysconf",
     ],
 )
 
@@ -48,6 +49,7 @@ libc_test(
         "//libc:munlock",
         "//libc:munlockall",
         "//libc:munmap",
+        "//libc:sysconf",
     ],
 )
 
@@ -89,6 +91,7 @@ libc_test(
         "//libc:msync",
         "//libc:munlock",
         "//libc:munmap",
+        "//libc:sysconf",
     ],
 )
 
@@ -111,6 +114,7 @@ libc_test(
         "//libc:munmap",
         "//libc:open",
         "//libc:remap_file_pages",
+        "//libc:sysconf",
     ],
 )
```

https://github.com/llvm/llvm-project/pull/163462