From ea3ff51d2ca57816411cda80e3b6f63214d75ebf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Fri, 23 Oct 2020 09:39:26 +0300
Subject: [PATCH] build-libcxx: Configure libcxx and generate headers before
 building libcxxabi

This fixes building with the latest versions, where the headers
strictly need __config_site to be available.
---
 build-libcxx.sh | 90 +++++++++++++++++++++++++++----------------------
 1 file changed, 50 insertions(+), 40 deletions(-)

diff --git a/build-libcxx.sh b/build-libcxx.sh
index abe170e..c15c62e 100755
--- a/build-libcxx.sh
+++ b/build-libcxx.sh
@@ -125,46 +125,8 @@ build_all() {
     done
     cd ..
 
-    cd libcxxabi
-    for arch in $ARCHS; do
-        [ -z "$CLEAN" ] || rm -rf build-$arch-$type
-        mkdir -p build-$arch-$type
-        cd build-$arch-$type
-        if [ "$type" = "shared" ]; then
-            LIBCXXABI_VISIBILITY_FLAGS="-D_LIBCPP_BUILDING_LIBRARY= -U_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS"
-        else
-            LIBCXXABI_VISIBILITY_FLAGS="-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS"
-        fi
-        cmake \
-            ${CMAKE_GENERATOR+-G} "$CMAKE_GENERATOR" \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DCMAKE_INSTALL_PREFIX="$PREFIX/$arch-w64-mingw32" \
-            -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
-            -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
-            -DCMAKE_CROSSCOMPILING=TRUE \
-            -DCMAKE_SYSTEM_NAME=Windows \
-            -DCMAKE_C_COMPILER_WORKS=TRUE \
-            -DCMAKE_CXX_COMPILER_WORKS=TRUE \
-            -DLLVM_PATH="$LLVM_PATH" \
-            -DLLVM_COMPILER_CHECKED=TRUE \
-            -DCMAKE_AR="$PREFIX/bin/llvm-ar" \
-            -DCMAKE_RANLIB="$PREFIX/bin/llvm-ranlib" \
-            -DLIBCXXABI_USE_COMPILER_RT=ON \
-            -DLIBCXXABI_ENABLE_EXCEPTIONS=ON \
-            -DLIBCXXABI_ENABLE_THREADS=ON \
-            -DLIBCXXABI_TARGET_TRIPLE=$arch-w64-mingw32 \
-            -DLIBCXXABI_ENABLE_SHARED=OFF \
-            -DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/include \
-            -DLIBCXXABI_LIBDIR_SUFFIX="" \
-            -DLIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS=OFF \
-            -DCXX_SUPPORTS_CXX_STD=TRUE \
-            -DCMAKE_CXX_FLAGS="$LIBCXXABI_VISIBILITY_FLAGS -D_LIBCPP_HAS_THREAD_API_WIN32" \
-            ..
-        $BUILDCMD ${CORES+-j$CORES}
-        cd ..
-    done
-    cd ..
-
+    # Configure, but don't build, libcxx, so that libcxxabi has
+    # proper headers to refer to
     cd libcxx
     for arch in $ARCHS; do
         [ -z "$CLEAN" ] || rm -rf build-$arch-$type
@@ -212,6 +174,54 @@ build_all() {
             -DCMAKE_SHARED_LINKER_FLAGS="-lunwind" \
             -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=FALSE \
             ..
+        $BUILDCMD ${CORES+-j$CORES} generate-cxx-headers
+        cd ..
+    done
+    cd ..
+
+    cd libcxxabi
+    for arch in $ARCHS; do
+        [ -z "$CLEAN" ] || rm -rf build-$arch-$type
+        mkdir -p build-$arch-$type
+        cd build-$arch-$type
+        if [ "$type" = "shared" ]; then
+            LIBCXXABI_VISIBILITY_FLAGS="-D_LIBCPP_BUILDING_LIBRARY= -U_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS"
+        else
+            LIBCXXABI_VISIBILITY_FLAGS="-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS"
+        fi
+        cmake \
+            ${CMAKE_GENERATOR+-G} "$CMAKE_GENERATOR" \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_INSTALL_PREFIX="$PREFIX/$arch-w64-mingw32" \
+            -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
+            -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
+            -DCMAKE_CROSSCOMPILING=TRUE \
+            -DCMAKE_SYSTEM_NAME=Windows \
+            -DCMAKE_C_COMPILER_WORKS=TRUE \
+            -DCMAKE_CXX_COMPILER_WORKS=TRUE \
+            -DLLVM_PATH="$LLVM_PATH" \
+            -DLLVM_COMPILER_CHECKED=TRUE \
+            -DCMAKE_AR="$PREFIX/bin/llvm-ar" \
+            -DCMAKE_RANLIB="$PREFIX/bin/llvm-ranlib" \
+            -DLIBCXXABI_USE_COMPILER_RT=ON \
+            -DLIBCXXABI_ENABLE_EXCEPTIONS=ON \
+            -DLIBCXXABI_ENABLE_THREADS=ON \
+            -DLIBCXXABI_TARGET_TRIPLE=$arch-w64-mingw32 \
+            -DLIBCXXABI_ENABLE_SHARED=OFF \
+            -DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/build-$arch-$type/include/c++/v1 \
+            -DLIBCXXABI_LIBDIR_SUFFIX="" \
+            -DLIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS=OFF \
+            -DCXX_SUPPORTS_CXX_STD=TRUE \
+            -DCMAKE_CXX_FLAGS="$LIBCXXABI_VISIBILITY_FLAGS -D_LIBCPP_HAS_THREAD_API_WIN32" \
+            ..
+        $BUILDCMD ${CORES+-j$CORES}
+        cd ..
+    done
+    cd ..
+
+    cd libcxx
+    for arch in $ARCHS; do
+        cd build-$arch-$type
         $BUILDCMD ${CORES+-j$CORES}
         $BUILDCMD install
         if [ "$type" = "shared" ]; then