!167 fix building with clang

From: @jchzhou 
Reviewed-by: @lyn1001 
Signed-off-by: @lyn1001

nodejs.spec

@@ -1,4 +1,4 @@
-%global baserelease 1
+%global baserelease 2
 %{?!_pkgdocdir:%global _pkgdocdir %{_docdir}/%{name}-%{version}}
 %global nodejs_epoch 1
 %global nodejs_major 20
@@ -237,10 +237,15 @@ export CXXFLAGS='%{optflags} \
                  -O3 \
                  -fno-ipa-icf'
 
-export CFLAGS="$(echo ${CFLAGS} | tr '\n\\' '  ')"
-export CXXFLAGS="$(echo ${CXXFLAGS} | tr '\n\\' '  ')"
+export CFLAGS="$(echo ${CFLAGS} | tr -s '[:space:]\\' ' ')"
+export CXXFLAGS="$(echo ${CXXFLAGS} | tr -s '[:space:]\\' ' ')"
 export LDFLAGS="%{build_ldflags}"
 
+%if "%toolchain" == "clang"
+export CFLAGS="$(echo ${CFLAGS} | sed -e s/-fno-ipa-icf//g)"
+export CXXFLAGS="$(echo ${CXXFLAGS} | sed -e s/-fno-ipa-icf//g)"
+%endif
+
 %{__python3} configure.py --prefix=%{_prefix} \
            --verbose \
            --ninja \
@@ -250,12 +255,14 @@ export LDFLAGS="%{build_ldflags}"
            --shared-zlib \
            --shared-brotli \
            --shared-libuv \
-           --enable-lto \
            %{dtrace_configure} \
            --with-intl=small-icu \
            --with-icu-default-data-dir=%{icudatadir} \
            --without-corepack \
-           --openssl-use-def-ca-store
+           --openssl-use-def-ca-store \
+%if "%toolchain" != "clang"
+           --enable-lto
+%endif
 
 %ninja_build -C out/Release
 
@@ -402,6 +409,10 @@ NODE_PATH=%{buildroot}%{_prefix}/lib/node_modules:%{buildroot}%{_prefix}/lib/nod
 %{_pkgdocdir}/npm/docs
 
 %changelog
+* Fri Nov 29 2024 jchzhou <zhoujiacheng@iscas.ac.cn> - 1:20.12.1-2
+- fix building w/ clang: only apply '-fno-ipa-icf' for gcc && disable LTO for clang + ld.bfd
+- improve the handling of trilling whitespaces in C/CXXFLAGS
+
 * Wed Sep 18 2024 yaoxin <yao_xin001@hoperun.com> - 1:20.12.1-1
 - Update to 20.12.1:
   * CVE-2024-27983 - Assertion failed in node::http2::Http2Session::~Http2Session()