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我已经安装了libeigen3-dev以便使用Eigen 3编译程序.当我包含一个文件时,例如Eigen / Dense我在尝试运行g时遇到此错误：
user@office-debian:~/Documents/prog$g src/main.cpp -MMD -std=c 11
In file included from src/main.cpp:9:0:
src/tdefs.h:16:23: fatal error: Eigen/Dense: No such file or directory
compilation terminated.
运行以下行正常工作：
g -I /usr/include/eigen3/ src/main.cpp -MMD -std=c 11
不应该包含目录由GCC自动找到,因为我通过aptitude安装了Eigen包？为什么在安装库而不是Eigen时会自动发现boost和OpenGL？ (请注意,eigen是一个仅限标头的库,但这不重要吗？)
运行g src / main.cpp -MMD -std = c 11 –verbose产生以下输出：
Using built-in specs.
COLLECT_GCC=g
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.2-5' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c ,go,fortran,objc,obj-c --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c /4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --with-arch-32=i586 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Debian 4.7.2-5)
COLLECT_GCC_OPTIONS='-MMD' '-std=c 11' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/4.7/cc1plus -quiet -v -imultiarch x86_64-linux-gnu -MMD main.d -D_GNU_SOURCE src/main.cpp -quiet -dumpbase main.cpp -mtune=generic -march=x86-64 -auxbase main -std=c 11 -version -o /tmp/ccoYRPKY.s
GNU C (Debian 4.7.2-5) version 4.7.2 (x86_64-linux-gnu)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version 3.1.0-p10, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c /4.7
/usr/include/c /4.7/x86_64-linux-gnu
/usr/include/c /4.7/backward
/usr/lib/gcc/x86_64-linux-gnu/4.7/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C (Debian 4.7.2-5) version 4.7.2 (x86_64-linux-gnu)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version 3.1.0-p10, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 66d178dd81da8c975e003e06d9f5e782
In file included from src/main.cpp:9:0:
src/tdefs.h:16:23: fatal error: Eigen/Dense: No such file or directory
compilation terminated.
解决方法: 使用–verbose开关运行编译器：
g --verbose ...
如果您的包含相对于此输出中显示的路径之一,则不必使用-I.这取决于如何配置gcc,它取决于安装其他内容的位置.
注意 .通常不在-I路径中.
后来
在交换了几个注释之后,显然/usr/include / eigen3 / Eigen / Dense应该包括#include< Eigen / Dense>,而不是#include< eigen3 / Eigen / Dense>.因此,必须添加命令行选项-I /usr/include / eigen3.
某些安装是否选择将头文件安装到编译为gcc的目录中的目录中,取决于默认值,分发者做出的决策或安装期间做出的决定.我会说“经常使用的”头文件(Boost)很好地放在/usr/local/include中,而一些“elitist”的东西在它自己的目录中会更好. 来源：https://www./content-4-477001.html
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