if gcc
These macros are also defined if you invoke the preprocessor directly. Also: __GNUG__. The GNU C++ compiler defines this. Testing it is ..., Very simple. Go to Command Prompt and type gcc -v. if gcc is installed on your PC, it should display a host of information, starting with the ...,GCC defines this macro if and only if the -ansi switch, or a -std switch specifying strict conformance to some version of ISO C or ISO C++, was specified when ... ,The ' #if ' directive allows you to test the value of an arithmetic expression, rather than the mere existence of one macro. Its syntax is. #if expression controlled ... ,The ' #if ' directive allows you to test the value of an arithmetic expression, rather than the mere existence of one macro. Its syntax is. #if expression controlled ... ,If the day of the month is less than 10, it is padded with a space on the left. If GCC cannot determine the current date, it will emit a warning message (once per ... ,If no -MF switch is given the preprocessor sends the rules to the same place it would send preprocessed output. When used with the driver options -MD or -MMD , - ... ,When an unrecognized warning option is requested (e.g., -Wunknown-warning ), GCC emits a diagnostic stating that the option is not recognized. However, if the - ... ,Both forms have the same type (including prototype), the same address (when their address is taken), and the same meaning as the C library functions even if ... , When writing portable C++ code you need to write conditional code that depends on compiler used or the OS for which the code is written. Here's ...
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 if gcc 相關參考資料
Detect gcc as opposed to msvc clang with macro - Stack ...
These macros are also defined if you invoke the preprocessor directly. Also: __GNUG__. The GNU C++ compiler defines this. Testing it is ... https://stackoverflow.com How to check if gcc is installed on my pc - Stack Overflow
Very simple. Go to Command Prompt and type gcc -v. if gcc is installed on your PC, it should display a host of information, starting with the ... https://stackoverflow.com Common Predefined Macros (The C Preprocessor) - GCC, the ...
GCC defines this macro if and only if the -ansi switch, or a -std switch specifying strict conformance to some version of ISO C or ISO C++, was specified when ... https://gcc.gnu.org If (The C Preprocessor) - GCC, the GNU Compiler Collection
The ' #if ' directive allows you to test the value of an arithmetic expression, rather than the mere existence of one macro. Its syntax is. #if expression controlled ... https://gcc.gnu.org The C Preprocessor: If - GCC, the GNU Compiler Collection
The ' #if ' directive allows you to test the value of an arithmetic expression, rather than the mere existence of one macro. Its syntax is. #if expression controlled ... https://gcc.gnu.org Standard Predefined Macros (The C Preprocessor) - GCC
If the day of the month is less than 10, it is padded with a space on the left. If GCC cannot determine the current date, it will emit a warning message (once per ... https://gcc.gnu.org Preprocessor Options - GCC, the GNU Compiler Collection
If no -MF switch is given the preprocessor sends the rules to the same place it would send preprocessed output. When used with the driver options -MD or -MMD , - ... https://gcc.gnu.org Warning Options (Using the GNU Compiler Collection (GCC))
When an unrecognized warning option is requested (e.g., -Wunknown-warning ), GCC emits a diagnostic stating that the option is not recognized. However, if the - ... https://gcc.gnu.org Other Builtins (Using the GNU Compiler Collection (GCC))
Both forms have the same type (including prototype), the same address (when their address is taken), and the same meaning as the C library functions even if ... https://gcc.gnu.org Guide to predefined macros in C++ compilers (gcc, clang ...
When writing portable C++ code you need to write conditional code that depends on compiler used or the OS for which the code is written. Here's ... https://blog.kowalczyk.info |