Recent questions tagged gcc

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gcc - Passing non-const references to rvalues in C++

In the following line of code: bootrec_reset(File(path, size, off), blksize); Calling a function with ... jibberish about rvalue references? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Why is _GNU_SOURCE defined by default and how to turn it off?

I'm using g++ and it told me that I defined _GNU_SOURCE on the command line, but I didn't. I now ... to #undef _GNU_SOURCE in every source file. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - How to get the type of a variable in C code?

Is there any way that I can discover the type of a variable automatically in C, either through some mechanism ... a different language. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - How to compile C++ under Ubuntu Linux?

I cut&pasted the below code from a previous question into a file called "avishay.cpp" and then ran gcc avishay.cpp only ... A!!!" return 1; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Why does arm-linux-gnueabi-g++-4.4 always build a "7-A" binary?

I'm running Ubuntu 12:04LTS and installed arm-linux-gnueabi C and C++ compiler. The compiled binary won't run on ... World"<<endl; return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Makefile removes object files for no reason

Here is the Makefile code: CC=gcc CXX=g++ OBJS=OMXComponent.o Event.o hello_jpeg.o JPEG.o OMXCore.o Locker.o ... o hello_jpeg.o Locker.o Event.o See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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873 views

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gcc - What does the "aw" flag in the section attribute mean?

In the following line of code (which declares a global variable), unsigned int __attribute__((section(".myVarSection ... around the nobits flag? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - C Struct array member without specific length

I have encountered this piece of code: struct test { uint32 num_fields; char array_field []; }; How can I ... gcc extension for the C language? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - CMake: The C Compiler is not able to compile a simple test program

I am trying to cross-compile the Azure IoT SDK C for a Mips processor. Cross-compiling an older version ... 1) SET (CMAKE_CXX_COMPILER_WORKS 1) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Linux shared library that uses a shared library undefined symbol

two shared libraries liba.so and libb.so. liba.so uses libb.so. All c files are compiled with -fPIC. Linking uses - ... .# at the end of libb??? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Unable to compile simple c program in Linux Mint 15

I am a Linux Mint 15 User. i wanted to write simple program in C. Below is my code.(hw.c) #include< ... /usr/lib/syslinux/com32/include/stdio.h See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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555 views

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gcc - Latest C++11 features with Android NDK

I am trying to use C++11 threading facilities with Android NDK, but not sure how to make it use the latest compilers ... I build with gcc 4.8? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Error installing python-snappy: snappy-c.h: No such file or directory

I am using amazon ec2 ubuntu 11.04 server sudo pip install python-snappy also I tried to downloaded package ... /github.com/andrix/python-snappy See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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553 views

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gcc - Can you mix c++ compiled with different versions of the same compiler

For example could I mix a set of libraries that have been compiled in say GCC-4.6 with GCC-4.9. I'm ... issues likely to occur? If so what? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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gcc - How to check the version of OpenMP on Linux

I wonder how to check the version of OpenMP on a Linux remote machine? I don't know where it is installed either. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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627 views

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gcc - What is the difference between "#pragma pack" and "__attribute__((aligned))"

#pragma pack(L1_CACHE_LINE) struct A { //... }; #pragma pack() A a; and struct A { //... }; ... L1_CACHE_LINE))) What's difference between them? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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776 views

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gcc - Very strange linker behavior

This is strange because I was able to get the error below to go away by removing the reference to libm. gcc ... , and that bothers me... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - C preprocessor: expand macro in a #warning

I would like to print a macro value (expand the macro) in the #warning directive. For example, for the code: ... how do I augment the code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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778 views

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gcc 4.8 on MAC OS X 10.8 throws "Undefined symbols for architecture x86_64: "

all,I write a code like this in my mac os x 10.8,and when I use "gcc use_new.cpp -o use_new " to compile it ... How are you!"<<endl; return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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795 views

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gcc - Where are the gcov symbols?

I'm trying to compile a simple app with gcov and getting the following link errors: gcc AllTests.o CuTestTest.o ... c -o CuTest.o CuTest.c See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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552 views

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gcc - at&t asm inline c++ problem

My Code const int howmany = 5046; char buffer[howmany]; asm("lea buffer,%esi"); //Get the address of ... each element to the al register. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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575 views

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gcc - GNU C native vectors: how to broadcast a scalar, like x86's _mm_set1_epi16

How do I write a portable GNU C builtin vectors version of this, which doesn't depend on the x86 set1 ... the division calls an SVML function! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gcc - Why Am I Getting Link Errors When Calling Function in Math.h?

When attempting to call functions in math.h, I'm getting link errors like the following undefined reference to ... the definition for sqrt? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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538 views

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gcc - why is char's sign-ness not defined in C?

The C standard states: ISO/IEC 9899:1999, 6.2.5.15 (p. 49) The three types char, signed char, ... to be defined as standard compatible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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699 views

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gcc - Statically linking GTK+ libraries in windows

I have installed GCC and GTK+. Its working fine, but i need to statically link GTK+ libraries with my application ( ... exist only one '.exe'. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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720 views

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gcc - #error "Must #define __STDC_LIMIT_MACROS before #including Support/DataTypes.h"

I have been trying to follow the tutorial at http://gnuu.org/2009/09/18/writing-your-own-toy-compiler/5/ ( ... that, could someone help me out? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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643 views

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gcc - Adding two floating-point numbers

I would like to compute the sum, rounded up, of two IEEE 754 binary64 numbers. To that end I wrote the C99 program ... required. in <fenv.h> | | See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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915 views

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gcc - C++ static initialization vs __attribute__((constructor))

Example: struct Foo { Foo() { printf("foo "); } }; static Foo foo; __attribute__((constructor)) static void ... doesn't say anything about it.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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