Recent questions tagged Gcc

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gcc - Retrieving x64 register values with inline asm

I was wondering if there was any way that would allow me to specify anything other than eax, ebx, ecx and edx as output ... : /* no input */ ); 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 Build error when getting the value of sin()

I have recently started learning C as a side project. I am working under OpenSuse with the latest NetBeans using the ... am I doing wrong here? 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 - Assembly 64bit: How to return a double value?

How do I return in Assembler a 64bit value ? I tried this: C-program: #include <stdio.h> double result=0; ... always 10.0 What did I wrong? 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 C structures get passed to function in assembly?

1)How C structures get passed to function in assembly. I mean pass by value, not pass by reference. 2)By the ... code above showed it wasn't. 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 do you load/store from/to an array of doubles with GNU C Vector Extensions?

I'm using GNU C Vector Extensions, not Intel's _mm_* intrinsics. I want to do the same thing as Intel ... while the second results in segfaults. 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 check (via the preprocessor) if a C source file is being compiled as C++ code

The question title should say it all, but here's an example of what sort of thing I'm looking for: #ifndef ... and close this as a dupe.) 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 - intrinsic for the mulx instruction

The mulx instruction was introduced with the BMI2 instruction set starting with the Haswell processor. According to ... Intel's documentation? 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 - Is the hash required for immediate values in ARM assembly?

I've been working on reading through some different arm assembly code generated by gcc, and I came across ... am I missing something magical? 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 use RDRAND intrinsics?

I was looking at H.J. Lu's PATCH: Update x86 rdrand intrinsics. I can't tell if I should be using _rdrand_u64, ... , or how to generate a block. 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 - gcov not generating gcda files

I tried to run gcov with -fprofile-arcs & -ftest-coverage and nothing for linking. It was giving this ... appreciated with vote up. 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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825 views

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gcc - ANSI C (ISO C90): Can scanf read/accept an unsigned char?

Simple question: Can scanf read/accept a "small integer" into an unsigned char in ANSI C? example code un_char.c ... be used in this situation? 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 - Post process `objdump --disassemble` with ARM cycle counts

Is there a script available for post processing some objdump --disassemble output to annotate with cycle counts? ... for a simple script. 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 - Undefined reference to 'pow' even though -lm is a compile flag. [C]

Any reason cc -g -lm -DBLITZ_HOST_IS_LITTLE_ENDIAN would produce an error with code using math.h? Is it possible ... a comment in the gist. See Question&Answers more detail:os...

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

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430 views

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gcc - Functional Programming (Currying) in C / Issue with Types

As a dyed-in-the-wool functional programmer I find it hard not to try to shoehorn my favourite paradigm into ... this in the real world. See Question&Answers more detail:os...

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

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836 views

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gcc - Cross Compile helloworld for ARM

I'm trying a simple cross compile (cc) for an ARM-CORTEX-A9: To keep things simple thats the c-code: ... helloworld.c -o helloworld_cc -static See Question&Answers more detail:os...

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

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771 views

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gcc - Compatible types and structures in C

I have the following code: int main(void) { struct { int x; } a, b; struct { int x; } c; struct { int x; ... *pList = &list1; /* Doesn't work */ See Question&Answers more detail:os...

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

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724 views

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gcc - Using condition flags as GNU C inline asm outputs

I'm working on some code where it would be highly desirable to take condition-flags output from an inline asm ... an operation in inline asm. See Question&Answers more detail:os...

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

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473 views

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gcc - C++: Vector bounds

I am coming from Java and learning C++ in the moment. I am using Stroustrup's Progamming Principles and Practice ... ways of compiling 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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943 views

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

I am trying to build program with multiple files for the first time. I have never had any problem with compliling ... .7.2-2ubuntu1). Thank you See Question&Answers more detail:os...

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

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604 views

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gcc - In C why do you need a statement after a goto label?

I am writing some C code and in my code I have two nested loops. On a particular condition I want to ... is a sub array break_then_continue: } See Question&Answers more detail:os...

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

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570 views

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gcc - Mathematical functions for SIMD registers

According to https://sourceware.org/glibc/wiki/libmvec GCC has vector implementation of math functions. They can be ... or in any other way? See Question&Answers more detail:os...

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

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769 views

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gcc - Valgrind Error: in use at exit: 72,704 bytes C++ Initialization List weirdness with char*

Issue: I have a weird issue that I wasn't expecting. I have a class called Answers and within the header is ... codeblocks.x86_64 13.12-14.fc22 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 - Linking symbols to fixed addresses on Linux

How would one go about linking (some) symbols to specific fixed addresses using GNU ld so that the binary could ... to the correct "addresses". See Question&Answers more detail:os...

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

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563 views

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gcc - Requirements to use flto

If I want to compile my project with -flto is it enough to have built gcc with --enable-gold or do I also need ... this gcc -flto one.c two.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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607 views

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gcc - How to tell Clang to stop pretending to be other compilers?

I've run into this issue in the past: LLVM defines __GNUC__, but it can't consume a program GCC can. ... char16_t and char32_t as builtin types. See Question&Answers more detail:os...

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

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660 views

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gcc implementation of rand()

I've tried for hours to find the implementation of rand() function used in gcc... It would be much ... implementations for the gcc compiler? See Question&Answers more detail:os...

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

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744 views

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gcc - Force static linking of library linked to Xcode target?

My Xcode target links against hdf5 library (using the Link Binary with Libraries build phase). libhdf5 is installed ... in the same location. See Question&Answers more detail:os...

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

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895 views

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gcc - How to resolve crt0.o linking issue in cross compiling?

How to add ctr0.o ? I get this error: yagarto-4.7.2/bin/arm-none-eabi-ld: cannot find ... entry symbol _start; defaulting to 0000000000008000 See Question&Answers more detail:os...

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

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