Replace --stdlibc=libc++ with -stdlibc=libc++

This ensures that it matches with CMake's understanding of this option
and when its removed then it silently removes -stdlibc=libc++ but leaves
the spurious '-' in the commandline which confuses the compiler as it
them expects input from stdin

Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/README.md b/README.md
index 826b8b3..3aa42da 100644
--- a/README.md
+++ b/README.md
@@ -76,14 +76,14 @@ if needed to by modifying `LIBCPLUSPLUS` variable, usually defaults used by `RUN
 best fit. e.g. below we select LLVM C++ as default C++ runtime.
 
 ```shell
-LIBCPLUSPLUS = "--stdlib=libc++"
+LIBCPLUSPLUS = "-stdlib=libc++"
 ```
 
 in `local.conf`.
 You can select libstdc++ per package too by writing bbappends for them containing
 
 ```shell
-LIBCPLUSPLUS_toolchain-clang_pn-<recipe> = "--stdlibc=libc++"
+LIBCPLUSPLUS_toolchain-clang_pn-<recipe> = "-stdlibc=libc++"
 ```
 Defaults are chosen to be GNU for maximum compatibility with existing GNU systems. Its always
 good to use single runtime on a system, mixing runtimes can cause complications during
diff --git a/classes/clang.bbclass b/classes/clang.bbclass
index b684ac5..d6a7fe8 100644
--- a/classes/clang.bbclass
+++ b/classes/clang.bbclass
@@ -22,7 +22,7 @@ UNWINDLIB_riscv32 = "--unwindlib=libgcc"
 UNWINDLIB_powerpc = "--unwindlib=libgcc"
 UNWINDLIB_armeb = "--unwindlib=libgcc"
 
-LIBCPLUSPLUS ??= "${@bb.utils.contains("RUNTIME", "llvm", "--stdlib=libc++", "", d)}"
+LIBCPLUSPLUS ??= "${@bb.utils.contains("RUNTIME", "llvm", "-stdlib=libc++", "", d)}"
 
 TARGET_CXXFLAGS_append_toolchain-clang = " ${LIBCPLUSPLUS}"
 TUNE_CCARGS_append_toolchain-clang = " ${COMPILER_RT} ${LIBCPLUSPLUS}"
@@ -95,7 +95,7 @@ def clang_base_deps(d):
                 ret += " libgcc "
             if (d.getVar('COMPILER_RT').find('--unwindlib=libunwind') != -1):
                 ret += " libcxx "
-            if (d.getVar('LIBCPLUSPLUS').find('--stdlib=libc++') != -1):
+            if (d.getVar('LIBCPLUSPLUS').find('-stdlib=libc++') != -1):
                 ret += " libcxx "
             else:
                 ret += " virtual/${TARGET_PREFIX}compilerlibs "