我正在尝试在 RHEL6 上构建 gcc 4.9.2，如下所示：
解压源代码压缩包（到 ~/gcc-4.9.2）
在源目录中：
./contrib/download_prerequisites
创建一个单独的构建目录 ~/gcc-4.9.2-build
在构建目录中：
~/gcc-4.9.2/configure --prefix=/usr/local/gcc-4.9.2
make
这失败了：
make[6]: Entering directory `/root/gcc-4.9.2-build-try0/x86_64-unknown-linux-gnu/libjava/classpath/native/jni/java-math'
/bin/sh ../../../libtool --tag=CC --mode=compile /root/gcc-4.9.2-build-try0/./gcc/xgcc -B/root/gcc-4.9.2-build-try0/./gcc/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/bin/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/include -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/sys-include -DHAVE_CONFIG_H -I. -I/root/gcc-4.9.2/libjava/classpath/native/jni/java-math -I../../../include -I/root/gcc-4.9.2/libjava/classpath/include -I/root/gcc-4.9.2/libjava/classpath/native/jni/classpath -I/root/gcc-4.9.2/libjava/classpath/native/jni/native-lib -W -Wall -Wmissing-declarations -Wwrite-strings -Wmissing-prototypes -Wno-long-long -I/usr/include -g -O2 -MT gnu_java_math_GMP.lo -MD -MP -MF .deps/gnu_java_math_GMP.Tpo -c -o gnu_java_math_GMP.lo /root/gcc-4.9.2/libjava/classpath/native/jni/java-math/gnu_java_math_GMP.c
libtool: compile: /root/gcc-4.9.2-build-try0/./gcc/xgcc -B/root/gcc-4.9.2-build-try0/./gcc/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/bin/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/include -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/sys-include -DHAVE_CONFIG_H -I. -I/root/gcc-4.9.2/libjava/classpath/native/jni/java-math -I../../../include -I/root/gcc-4.9.2/libjava/classpath/include -I/root/gcc-4.9.2/libjava/classpath/native/jni/classpath -I/root/gcc-4.9.2/libjava/classpath/native/jni/native-lib -W -Wall -Wmissing-declarations -Wwrite-strings -Wmissing-prototypes -Wno-long-long -I/usr/include -g -O2 -MT gnu_java_math_GMP.lo -MD -MP -MF .deps/gnu_java_math_GMP.Tpo -c /root/gcc-4.9.2/libjava/classpath/native/jni/java-math/gnu_java_math_GMP.c -fPIC -DPIC -o .libs/gnu_java_math_GMP.o
mv -f .deps/gnu_java_math_GMP.Tpo .deps/gnu_java_math_GMP.Plo
/bin/sh ../../../libtool --tag=CC --mode=link /root/gcc-4.9.2-build-try0/./gcc/xgcc -B/root/gcc-4.9.2-build-try0/./gcc/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/bin/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/include -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/sys-include -W -Wall -Wmissing-declarations -Wwrite-strings -Wmissing-prototypes -Wno-long-long -I/usr/include -g -O2 -module -version-info 0:0:0 -no-undefined -lgmp -avoid-version -o libjavamath.la -rpath /usr/local/gcc-4.9.2/lib/../lib64/gcj-4.9.2-15 gnu_java_math_GMP.lo ../../../native/jni/classpath/jcl.lo -lrt
libtool: link: /root/gcc-4.9.2-build-try0/./gcc/xgcc -B/root/gcc-4.9.2-build-try0/./gcc/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/bin/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/include -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/sys-include -shared .libs/gnu_java_math_GMP.o ../../../native/jni/classpath/.libs/jcl.o /root/gcc-4.9.2-build-try0/./gmp/.libs/libgmp.a -lrt -Wl,-soname -Wl,libjavamath.so -o .libs/libjavamath.so
/usr/bin/ld: /root/gcc-4.9.2-build-try0/./gmp/.libs/libgmp.a(mp_set_fns.o): relocation R_X86_64_32 against `__gmp_default_allocate' can not be used when making a shared object; recompile with -fPIC
/root/gcc-4.9.2-build-try0/./gmp/.libs/libgmp.a: could not read symbols: Bad value
collect2: error: ld returned 1 exit status
make[6]: *** [libjavamath.la] Error 1
make[6]: Leaving directory `/root/gcc-4.9.2-build-try0/x86_64-unknown-linux-gnu/libjava/classpath/native/jni/java-math'
一点谷歌搜索指出我在 --disable-shared 选项，这有点帮助，但现在：
在构建目录中：
~/gcc-4.9.2/configure --prefix=/usr/local/gcc-4.9.2 --disable-shared
make
产生了一个稍微不同的错误：
make[8]: Entering directory `/root/gcc-4.9.2-build/x86_64-unknown-linux-gnu/32/libjava/classpath/native/jni/classpath'
/bin/sh ../../../libtool --tag=CC --mode=compile /root/gcc-4.9.2-build/./gcc/xgcc -B/root/gcc-4.9.2-build/./gcc/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/bin/ -B/usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/include -isystem /usr/local/gcc-4.9.2/x86_64-unknown-linux-gnu/sys-include -m32 -DHAVE_CONFIG_H -I. -I/root/gcc-4.9.2/libjava/classpath/native/jni/classpath -I../../../include -I/root/gcc-4.9.2/libjava/classpath/include -I/root/gcc-4.9.2/libjava/classpath/native/jni/classpath -I/root/gcc-4.9.2/libjava/classpath/native/jni/native-lib -W -Wall -Wmissing-declarations -Wwrite-strings -Wmissing-prototypes -Wno-long-long -Wstrict-prototypes -pedantic -fexceptions -fasynchronous-unwind-tables -g -O2 -m32 -MT jcl.lo -MD -MP -MF .deps/jcl.Tpo -c -o jcl.lo /root/gcc-4.9.2/libjava/classpath/native/jni/classpath/jcl.c
libtool: compile: not configured to build any kind of library
libtool: compile: See the libtool documentation for more information.
libtool: compile: Fatal configuration error.
make[8]: *** [jcl.lo] Error 1
make[8]: Leaving directory `/root/gcc-4.9.2-build/x86_64-unknown-linux-gnu/32/libjava/classpath/native/jni/classpath'
添加 --enable-static 选项没有任何区别。
关于什么可能是错的任何建议？
顺便说一句，gcc 4.9.1 给出了同样的错误。
系统：Linux 2.6.32-431.29.2.el6.x86_64 #1 SMP Sun Jul 27 15:55:46 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux
系统是 RHEL6，通过 Redhat 进行了全面更新，并且没有我所知道的自定义 RPM。