[do not review] fix: remove explicit CXX from reflex third party

.github/workflows/daily-builds.yml

@@ -100,15 +100,26 @@ jobs:
       - name: Configure & Build
         run: |
           cd $GITHUB_WORKSPACE/build
-
           export PATH=/usr/local/opt/bison/bin:$PATH
-          gcc-12 --version
+
+          # We need -isysroot such that we fetch both include and lib dirs for standard library
+          # On macos-15 /usr/bin/cc or /usr/bin/clang does this automatically. However for macos-13 it seems that this is not the case.
+          # Furthermore, keep in mind that on macos-15, /Applications/Xcode.app/... have been moved to /Library/Developer
+          # so if we upgrade this flow to use a newer version this might fail.
+          export CPPFLAGS="-isysroot $(xcrun --sdk macosx --show-sdk-path)"
+          export CCFLAGS="-isysroot $(xcrun --sdk macosx --show-sdk-path)"
+          #ls -lah /Library/Developer/CommandLineTools/usr/bin/clang
+
+          #echo "next ls"
+
+          #ls -lah /Library/Developer/
+
 
           bison --version
 
           echo "*************************** START BUILDING **************************************"
-          CC=gcc-12 CXX=g++-12 cmake .. -DCMAKE_BUILD_TYPE=Debug -GNinja -DWITH_UNWIND=OFF \
-            -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_FLAGS="-Wl,-ld_classic"
+          CC=/usr/bin/clang CXX=/usr/bin/clang++ cmake .. -DCMAKE_BUILD_TYPE=Debug -GNinja -DWITH_UNWIND=OFF \
+            -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_FLAGS="-Wl"
 
           ninja src/all
 

src/CMakeLists.txt

@@ -66,7 +66,6 @@ add_third_party(
   URL https://github.com/Genivia/RE-flex/archive/refs/tags/v5.2.2.tar.gz
   PATCH_COMMAND autoreconf -fi
   CONFIGURE_COMMAND <SOURCE_DIR>/configure --disable-avx2 --prefix=${THIRD_PARTY_LIB_DIR}/reflex
-          CXX=${CMAKE_CXX_COMPILER} CC=${CMAKE_C_COMPILER}
 )
 
 set(REFLEX "${THIRD_PARTY_LIB_DIR}/reflex/bin/reflex")