gcc – Page 2 – Tarik Billa

Check gcc minor in cmake

December 9, 2023 by Tarik

Use if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.2) as mentioned by onqtam. This obsolete answer was back from the 2.6 CMake days. You could run gcc -dumpversion and parse the output. Here is one way to do that: if (CMAKE_COMPILER_IS_GNUCC) execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION) string(REGEX MATCHALL “[0-9]+” GCC_VERSION_COMPONENTS ${GCC_VERSION}) list(GET GCC_VERSION_COMPONENTS 0 GCC_MAJOR) list(GET GCC_VERSION_COMPONENTS 1 GCC_MINOR) message(STATUS … Read more

Issue with Redis install “cc: Command not found”

December 7, 2023 by Tarik

wget http://download.redis.io/redis-stable.tar.gz tar xvzf redis-stable.tar.gz cd redis-stable sudo apt-get install make sudo apt-get install gcc sudo apt-get install tcl sudo apt-get install build-essential sudo apt-get update ## if there is another error like “fatal error: jemalloc/jemalloc.h: No such file or directory” ## just run “make distclean” make make test

Is there a Linux equivalent of Windows’ “resource files”?

December 6, 2023 by Tarik

It’s actually quite simple on Linux and other ELF systems: http://www.linuxjournal.com/content/embedding-file-executable-aka-hello-world-version-5967 OS X has bundles, so you just build your library as a framework and put the file in the bundle.

Selecting message language in gcc and g++

December 5, 2023 by Tarik

The end of the GCC manpage contains an overview of its locale environment variables: LANG LC_CTYPE LC_MESSAGES LC_ALL These environment variables control the way that GCC uses localization information that allow GCC to work with different national conventions. GCC inspects the locale categories LC_CTYPE and LC_MESSAGES if it has been configured to do so. These … Read more

could not read symbols: Archive has no index; run ranlib to add one

December 4, 2023 by Tarik

Your archive command looks fine, can you try the following. 1) Get the object files in the archive/static library ar -t libtestlib.a 2) For each object file (say foo.o) from step 1 file foo.o This will tell you the format of the object file. If the object file was compiled for a different platform, this … Read more

g++ output: file not recognized: File format not recognized

November 30, 2023 by Tarik

This is wrong: g++ -c src/CNumber.cpp src/CNumber.h -o src/CNumber.o You shouldn’t “compile” .h files. Doing so will create precompiled header files, which are not used to create an executable. The above should simply be g++ -c src/CNumber.cpp -o src/CNumber.o Similar for compiling the other .cpp files

Matlab Kalman /usr/bin/ld: cannot find -lstdc++

November 30, 2023 by Tarik

For Fedora 16 use: sudo yum install libstdc++-static

GCC how to add before the default linker search path by default? LIBRARY_PATH not working

November 29, 2023 by Tarik

As the GCC manual says, LIBRARY_PATH is the correct environment variable to add directories to the library search path. If you add -v to the g++ command you should see the LIBRARY_PATH that it uses, and you should see it includes the directory you have specified, and that it gets added to the collect2 command … Read more

Using GCC’s link-time optimization with static linked libraries

November 29, 2023 by Tarik

Here is an MCVE CMake project that reproduces the problem: $ ls -R hellow hellow: CMakeLists.txt hello.c libhello.c $ cat hellow/CMakeLists.txt cmake_minimum_required (VERSION 2.6) project (hellow) SET(CMAKE_C_FLAGS “${CMAKE_C_FLAGS} -flto”) SET(CMAKE_EXE_LINKER_FLAGS “${CMAKE_EXE_LINKER_FLAGS} -flto”) #SET(CMAKE_AR “gcc-ar”) #SET(CMAKE_C_ARCHIVE_CREATE “<CMAKE_AR> qcs <TARGET> <LINK_FLAGS> <OBJECTS>”) #SET(CMAKE_C_ARCHIVE_FINISH true) add_library(hello STATIC libhello.c) add_executable(hellow hello.c) target_link_libraries(hellow hello) add_dependencies(hellow hello) $ cat hellow/hello.c extern … Read more

Trouble building gcc 4.6: undefined reference to `yylex’

November 29, 2023 by Tarik

Same happened to me, it was due to lack of flex and bison. After installing flex and bison, I ran make distclean and ./configure, then it compiled fine.