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The GNU Compiler Collection (GCC) is a compiler system developed by the GNU Project. Originally written by Richard Stallman and Ian Lance Taylor, GCC was first released in 1987 and has since become one of the most widely used compilers in the world. GCC supports a wide range of programming languages, including C, C++, Objective-C, Fortran, Ada, Go, and Rust. Sources: * [The GNU Compiler Collection (GCC) - Wikipedia](https://en.wikipedia.org/wiki/GNU_Compiler_Collection)

Ask the right questions secure the right GNU Compiler Collection(gcc) talent among an increasingly shrinking pool of talent.

First 20 minutes

General GNU Compiler Collection(gcc) app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in GNU Compiler Collection(gcc) application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

What are the basic commands to compile a C program using gcc?

The basic commands are 'gcc -o outputfile sourcefile.c' to compile and 'gcc -g sourcefile.c' to debug.

How would you use gcc to compile multiple source files into a single executable?

You can use 'gcc -o outputfile sourcefile1.c sourcefile2.c' to compile multiple source files into a single executable.

What is the purpose of the -Wall flag in gcc?

The -Wall flag enables all compiler's warning messages. This helps to identify and rectify potential issues in the code.

Describe the difference between static and dynamic linking in gcc.

Static linking includes all library code into the executable while dynamic linking includes only references to the library, which are resolved at runtime.

How would you use gcc to compile a program that requires a specific library?

You can use 'gcc -o outputfile sourcefile.c -lLibraryName' to compile a program that requires a specific library.

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What you’re looking for early on

Does the candidate have a deep understanding of the GNU Compiler Collection?

Has the candidate demonstrated problem-solving skills?

Does the candidate have experience in C and C++ programming languages?

Has the candidate shown the ability to work collaboratively?

Next 20 minutes

Specific GNU Compiler Collection(gcc) development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What are the steps to debug a program using gcc and gdb?

First, compile the program with the -g flag. Then, run gdb with the program as an argument. Use gdb commands like 'run', 'break', 'next', 'step' and 'print' to debug.

Describe the difference between -O1, -O2 and -O3 optimization levels in gcc.

-O1 provides basic optimization, -O2 provides further optimization including increased code size, and -O3 provides even more optimization including vectorization.

How would you use gcc to generate assembly code from a C program?

You can use 'gcc -S sourcefile.c' to generate assembly code from a C program.

What is the purpose of the -march and -mtune flags in gcc?

-march specifies the target architecture and enables all instruction subsets that the target processor supports. -mtune optimizes the code for a specific type of processor.

How would you use gcc to compile a program for a different architecture?

You can use 'gcc -o outputfile sourcefile.c -march=arch' where 'arch' is the target architecture.

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At this point, a skilled GNU Compiler Collection(gcc) engineer should demonstrate strong problem-solving abilities, proficiency in GNU Compiler Collection(gcc) programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with GNU Compiler Collection(gcc).

What does the following simple gcc command do?
gcc -o hello hello.c
This gcc command compiles the 'hello.c' source file and outputs the executable file named 'hello'. The '-o' option is used to specify the output file name.
What does the following gcc command do?
gcc -g -Wall -Werror main.c -o main
This command compiles the 'main.c' source file with debugging information included in the executable (due to '-g'). The '-Wall' option enables all compiler's warning messages and '-Werror' makes all warnings into errors. The output executable file is named 'main'.
What does the following C code do?
int arr[5] = {1, 2, 3, 4, 5};
for(int i = 0; i < 5; i++) {
printf("%d ", arr[i]);
}
This C code declares an array of 5 integers and initializes it with the values 1 to 5. It then uses a for loop to print each element of the array on the console.
What does the following C code do?
#include 
void *print_message(void *ptr) {
char *message;
message = (char *) ptr;
printf("%s \n", message);
}
pthread_t thread1, thread2;
char *message1 = "Thread 1";
char *message2 = "Thread 2";
pthread_create( &thread1, NULL, print_message, (void*) message1);
pthread_create( &thread2, NULL, print_message, (void*) message2);
This C code creates two threads, thread1 and thread2, using the pthread_create function. Each thread will execute the 'print_message' function, which prints the message passed to it. The messages 'Thread 1' and 'Thread 2' are passed to the threads respectively.

Wrap-up questions

Final candidate for GNU Compiler Collection(gcc) Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle GNU Compiler Collection(gcc) application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are the steps to profile a program using gcc and gprof?

First, compile the program with the -pg flag. Then, run the program to generate a 'gmon.out' file. Finally, run 'gprof executable' to get the profile data.

Describe the difference between the -fpic and -fPIC options in gcc.

-fpic generates position independent code suitable for small libraries, while -fPIC generates position independent code for larger libraries.

How would you use gcc to generate position independent code?

You can use 'gcc -c -fpic sourcefile.c' or 'gcc -c -fPIC sourcefile.c' to generate position independent code.

GNU Compiler Collection(gcc) application related

Product Perfect's GNU Compiler Collection(gcc) development capabilities

Beyond hiring for your GNU Compiler Collection(gcc) engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in GNU Compiler Collection(gcc) projects, and can engage in multiple capacities.

GNU Compiler Collection(gcc) Consultive assessments

GNU Compiler Collection(gcc) Application Conversion Assessment GNU Compiler Collection(gcc) Application Integration Assessment GNU Compiler Collection(gcc) Data & Database Integration Assessment

Custom GNU Compiler Collection(gcc) development projects

Custom GNU Compiler Collection(gcc) App Conversion GNU Compiler Collection(gcc) Custom App Development Process App UI Design for GNU Compiler Collection(gcc) Facelifts

Hiring guide for GNU Compiler Collection(gcc) Engineers

GNU Compiler Collection(gcc) Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the GNU Compiler Collection(gcc) engineer at this point.

GNU Compiler Collection(gcc) Consultive assessments

Custom GNU Compiler Collection(gcc) development projects