Fix: Add a space between -isystem and the directory (#21599)

Some compilers, such as the NV compilers, do not recognize -isystem
dir when specified without a space.

Works: -isystem ../include
Does not work: -isystem../include

This PR updates the compiler wrapper to include the space with -isystem.

2 files changed, 15 insertions, 15 deletions

diff --git a/lib/spack/env/cc b/lib/spack/env/cc
index 4833cda3cf..99e164dbc7 100755
--- a/lib/spack/env/cc
+++ b/lib/spack/env/cc
@@ -497,19 +497,19 @@ args+=("${flags[@]}")
 # Insert include directories just prior to any system include directories
 
 for dir in "${includes[@]}";         do args+=("-I$dir"); done
-for dir in "${isystem_includes[@]}";         do args+=("-isystem$dir"); done
+for dir in "${isystem_includes[@]}";         do args+=("-isystem" "$dir"); done
 
 IFS=':' read -ra spack_include_dirs <<< "$SPACK_INCLUDE_DIRS"
 if [[ $mode == cpp || $mode == cc || $mode == as || $mode == ccld ]]; then
     if [[ "$isystem_was_used" == "true" ]] ; then
-	for dir in "${spack_include_dirs[@]}";  do args+=("-isystem$dir"); done
+	for dir in "${spack_include_dirs[@]}";  do args+=("-isystem" "$dir"); done
     else
 	for dir in "${spack_include_dirs[@]}";  do args+=("-I$dir"); done
     fi
 fi
 
 for dir in "${system_includes[@]}";  do args+=("-I$dir"); done
-for dir in "${isystem_system_includes[@]}";  do args+=("-isystem$dir"); done
+for dir in "${isystem_system_includes[@]}";  do args+=("-isystem" "$dir"); done
 
 # Library search paths
 for dir in "${libdirs[@]}";          do args+=("-L$dir"); done
diff --git a/lib/spack/spack/test/cc.py b/lib/spack/spack/test/cc.py
index 444810d7a8..59b2f8e4cb 100644
--- a/lib/spack/spack/test/cc.py
+++ b/lib/spack/spack/test/cc.py
@@ -350,15 +350,15 @@ def test_ccld_deps_isystem():
     with set_env(SPACK_INCLUDE_DIRS='xinc:yinc:zinc',
                  SPACK_RPATH_DIRS='xlib:ylib:zlib',
                  SPACK_LINK_DIRS='xlib:ylib:zlib'):
-        mytest_args = test_args + ['-isystemfooinc']
+        mytest_args = test_args + ['-isystem', 'fooinc']
         check_args(
             cc, mytest_args,
             [real_cc] +
             test_include_paths +
-            ['-isystemfooinc',
-             '-isystemxinc',
-             '-isystemyinc',
-             '-isystemzinc'] +
+            ['-isystem', 'fooinc',
+             '-isystem', 'xinc',
+             '-isystem', 'yinc',
+             '-isystem', 'zinc'] +
             test_library_paths +
             ['-Lxlib',
              '-Lylib',
@@ -432,20 +432,20 @@ def test_ccld_with_system_dirs_isystem():
                  SPACK_RPATH_DIRS='xlib:ylib:zlib',
                  SPACK_LINK_DIRS='xlib:ylib:zlib'):
 
-        sys_path_args = ['-isystem/usr/include',
+        sys_path_args = ['-isystem', '/usr/include',
                          '-L/usr/local/lib',
                          '-Wl,-rpath,/usr/lib64',
-                         '-isystem/usr/local/include',
+                         '-isystem', '/usr/local/include',
                          '-L/lib64/']
         check_args(
             cc, sys_path_args + test_args,
             [real_cc] +
             test_include_paths +
-            ['-isystemxinc',
-             '-isystemyinc',
-             '-isystemzinc'] +
-            ['-isystem/usr/include',
-             '-isystem/usr/local/include'] +
+            ['-isystem', 'xinc',
+             '-isystem', 'yinc',
+             '-isystem', 'zinc'] +
+            ['-isystem', '/usr/include',
+             '-isystem', '/usr/local/include'] +
             test_library_paths +
             ['-Lxlib',
              '-Lylib',