[llvm] 505e1cd - [gn build] Define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER when building libcxx

[Nico Weber via llvm-commits]

Author: Nico Weber
Date: 2022-02-26T10:25:01-05:00
New Revision: 505e1cda5720fd56da914431f1c5b0fe408a7856

URL: https://github.com/llvm/llvm-project/commit/505e1cda5720fd56da914431f1c5b0fe408a7856
DIFF: https://github.com/llvm/llvm-project/commit/505e1cda5720fd56da914431f1c5b0fe408a7856.diff

LOG: [gn build] Define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER when building libcxx

Ports 87a82490fc6b89fd3 in a way. Has the effect of enabling warnings
when building libcxx itself, but more importantly this is required
after 5aaefa510ef0 to not get build errors when building libcxx itself.

Added: 
    

Modified: 
    llvm/utils/gn/secondary/libcxx/src/BUILD.gn

Removed: 
    


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diff  --git a/llvm/utils/gn/secondary/libcxx/src/BUILD.gn b/llvm/utils/gn/secondary/libcxx/src/BUILD.gn
index 74c2ac9abbc35..fecb043ff2f31 100644
--- a/llvm/utils/gn/secondary/libcxx/src/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/src/BUILD.gn
@@ -55,7 +55,10 @@ config("cxx_config") {
     "-std=c++20",
     "-nostdinc++",
   ]
-  defines = [ "_LIBCPP_BUILDING_LIBRARY" ]
+  defines = [
+    "_LIBCPP_BUILDING_LIBRARY",
+    "_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER",
+  ]
   if (target_os == "win") {
     cflags += [ "/Zl" ]
     defines += [