Eu tenho dois computadores com o Gentoo, ambos no AMD64. Eu tento construir um programa a seguir:
int main() {tgetent();}
O comando para compilar é:
gcc -v 1.c -Wl,--as-needed -lncurses
Em um computador, ele não consegue encontrar a função e, no outro, pode. Sem sinalizador - como necessário, vincula-se corretamente. As versões dos compiladores e binutils são as mesmas.
Aqui estão os registros na primeira e segunda máquina:
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.3/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.7.3-r1/work/gcc-4.7.3/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.3 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.3 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.3/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.3/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.7.3/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.7.3-r1 p1.4, pie-0.5.5' --enable-libstdcxx-time --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --disable-multilib --with-multilib-list=m64 --disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp --disable-libmudflap --disable-libssp --enable-lto --without-cloog --without-ppl
Thread model: posix
gcc version 4.7.3 (Gentoo 4.7.3-r1 p1.4, pie-0.5.5)
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/cc1 -quiet -v 1.c -quiet -dumpbase 1.c -mtune=generic -march=x86-64 -auxbase 1 -version -o /tmp/cckCeNIy.s
GNU C (Gentoo 4.7.3-r1 p1.4, pie-0.5.5) version 4.7.3 (x86_64-pc-linux-gnu)
compiled by GNU C version 4.7.3, GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include-fixed
/usr/include
End of search list.
GNU C (Gentoo 4.7.3-r1 p1.4, pie-0.5.5) version 4.7.3 (x86_64-pc-linux-gnu)
compiled by GNU C version 4.7.3, GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 39edf3479a880e47daebbbc3740ccab0
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/bin/as -v --64 -o /tmp/cckazMHs.o /tmp/cckCeNIy.s
GNU assembler version 2.23.2 (x86_64-pc-linux-gnu) using BFD version (GNU Binutils) 2.23.2
COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/collect2 --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crt1.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/crtbegin.o -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../.. /tmp/cckazMHs.o --as-needed -lncurses -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/crtend.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crtn.o
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.3/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home_old/tmp/portage/sys-devel/gcc-4.7.3-r1/work/gcc-4.7.3/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.3 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.3 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.3/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.3/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.7.3/python --enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.7.3-r1 p1.4, pie-0.5.5' --enable-libstdcxx-time --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp --disable-libmudflap --disable-libssp --disable-libquadmath --enable-lto --without-cloog --without-ppl
Thread model: posix
gcc version 4.7.3 (Gentoo 4.7.3-r1 p1.4, pie-0.5.5)
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/cc1 -quiet -v 1.c -quiet -dumpbase 1.c -mtune=generic -march=x86-64 -auxbase 1 -version -o /tmp/cc830JX6.s
GNU C (Gentoo 4.7.3-r1 p1.4, pie-0.5.5) version 4.7.3 (x86_64-pc-linux-gnu)
compiled by GNU C version 4.7.3, GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include
/usr/local/include
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include-fixed
/usr/include
End of search list.
GNU C (Gentoo 4.7.3-r1 p1.4, pie-0.5.5) version 4.7.3 (x86_64-pc-linux-gnu)
compiled by GNU C version 4.7.3, GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: d486e53a9a5b8aa6182027c91a2ba0e6
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/bin/as -v --64 -o /tmp/ccl4EIq9.o /tmp/cc830JX6.s
GNU assembler version 2.23.2 (x86_64-pc-linux-gnu) using BFD version (GNU Binutils) 2.23.2
COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.3/collect2 --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crt1.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/crtbegin.o -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../.. /tmp/ccl4EIq9.o --as-needed -lncurses -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/crtend.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crtn.o
/tmp/ccl4EIq9.o: In function 'main':
1.c:(.text+0xa): undefined reference to 'tgetent'
collect2: error: ld returned 1 exit status
Qual poderia ser o problema?