[libc] Replace mentions of LIBC_FULLBUILD with LLVM_LIBC_FULL_BUILD in 'examples/'

[Rajveer100]

Resolves #88328

[llvmbot]

@llvm/pr-subscribers-libc

Author: Rajveer Singh Bharadwaj (Rajveer100)

Changes

Resolves #88328

---

Full diff: https://github.com/llvm/llvm-project/pull/88657.diff

2 Files Affected:

• (modified) libc/examples/README.md (+1-1)
• (modified) libc/examples/examples.cmake (+2-2)

diff --git a/libc/examples/README.md b/libc/examples/README.md
index 36b886090c6c1c..f3fb45b84f7f72 100644
--- a/libc/examples/README.md
+++ b/libc/examples/README.md
@@ -59,7 +59,7 @@ have installed them, you have to inform CMake that we are linking against the
 full libc as follows:
 
 ```bash
-cmake ../ -G <GEN> -DLIBC_FULLBUILD=ON    \
+cmake ../ -G <GEN> -LLVM_LIBC_FULL_BUILD=ON    \
   -DCMAKE_SYSROOT=<SYSROOT>               \
   -DCMAKE_C_COMPILER=<SYSROOT>/bin/clang  \
   -DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY
diff --git a/libc/examples/examples.cmake b/libc/examples/examples.cmake
index 81e99e3cbede9c..6bb6b41c252f5b 100644
--- a/libc/examples/examples.cmake
+++ b/libc/examples/examples.cmake
@@ -4,13 +4,13 @@ function(add_example name)
     ${ARGN}
   )
 
-  if(LIBC_FULLBUILD)
+  if(LLVM_LIBC_FULL_BUILD)
     target_link_options(${name} PRIVATE -static -rtlib=compiler-rt -fuse-ld=lld)
   elseif(LIBC_OVERLAY_ARCHIVE_DIR)
     target_link_directories(${name} PRIVATE ${LIBC_OVERLAY_ARCHIVE_DIR})
     target_link_options(${name} PRIVATE -l:libllvmlibc.a)
   else()
-    message(FATAL_ERROR "Either LIBC_FULLBUILD should be on or "
+    message(FATAL_ERROR "Either LLVM_LIBC_FULL_BUILD should be on or "
                         "LIBC_OVERLAY_ARCHIVE_DIR should be set.")
   endif()
 endfunction()

[Rajveer100]

@nickdesaulniers
Could you land this for me?

[Rajveer100]

Thanks! @jhuber6