[workflows] Enable verbose output with -v

For debugging purpose, add a -v option to build-flang.sh to enable verbose
output. The option sets $VERBOSE to an non-empty string which forces the
CMake-generated Makefile to print every command it runs.

.github/workflows/build_flang.yml

@@ -86,7 +86,7 @@ jobs:
       - name: Build and install flang & libpgmath
         run: |
           ${{ env.install_prefix }}/bin/clang --version
-          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n $(nproc) -c -s
+          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n $(nproc) -c -s -v
 
       - name: Copy llvm-lit
         run: |

.github/workflows/build_flang_arm64.yml

@@ -54,7 +54,7 @@ jobs:
       - name: Build and install flang & libpgmath
         run: |
           cd ${{ env.build_path }}/flang
-          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n `nproc --ignore=1`
+          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n `nproc --ignore=1` -v
 
       # Copy llvm-lit
       - name: Copy llvm-lit

build-flang.sh

@@ -10,6 +10,7 @@ INSTALL_PREFIX="/usr/local"
 NPROC=1
 USE_CCACHE="0"
 USE_SUDO="0"
+VERBOSE=""
 
 set -e # Exit the script on first error.
 
@@ -30,16 +31,18 @@ function print_usage {
     echo "  -n  Number of parallel jobs. Default: 1";
     echo "  -c  Use ccache. Default: 0 - do not use ccache";
     echo "  -s  Use sudo to install. Default: 0 - do not use sudo";
+    echo "  -v  Enable verbose output";
 }
 
-while getopts "t:d:p:n:c?s?" opt; do
+while getopts "t:d:p:n:c?s?v" opt; do
     case "$opt" in
         t) TARGET=$OPTARG;;
         d) BUILD_TYPE=$OPTARG;;
         p) INSTALL_PREFIX=$OPTARG;;
         n) NPROC=$OPTARG;;
         c) USE_CCACHE="1";;
         s) USE_SUDO="1";;
+        v) VERBOSE="1";;
         ?) print_usage; exit 0;;
     esac
 done
@@ -60,8 +63,12 @@ fi
 # Build and install libpgmath
 cd runtime/libpgmath
 mkdir -p build && cd build
+if [ -n "$VERBOSE" ]; then
+  set -x
+fi
 cmake $CMAKE_OPTIONS ..
-make -j$NPROC
+set +x
+make -j$NPROC VERBOSE=$VERBOSE
 if [ $USE_SUDO == "1" ]; then
   echo "Install with sudo"
   sudo make install
@@ -74,14 +81,18 @@ cd ../../..
 
 # Build and install flang
 mkdir -p build && cd build
+if [ -n "$VERBOSE" ]; then
+  set -x
+fi
 cmake $CMAKE_OPTIONS \
       -DCMAKE_Fortran_COMPILER=$INSTALL_PREFIX/bin/flang \
       -DCMAKE_Fortran_COMPILER_ID=Flang \
       -DFLANG_INCLUDE_DOCS=ON \
       -DFLANG_LLVM_EXTENSIONS=ON \
       -DWITH_WERROR=ON \
       ..
-make -j$NPROC
+set +x
+make -j$NPROC VERBOSE=$VERBOSE
 if [ $USE_SUDO == "1" ]; then
   echo "Install with sudo"
   sudo make install