-fvisibility=hidden makes all your symbols hidden by default. What you then have to do, is choose which functions you want to be visible to users linking against your library and make them visible by marking them with a visible attribute. E.g. void __attribute__((visibility(“default”))) Exported() { // … }
This part of the gnu sed manual you linked to explains that whether you should escape parentheses depends on whether you are using basic regular expressions or extended regular expressions. This part says that the -r flag determines what mode you are in. Edit: as stated in grok12’s comment, the -E flag in bsd sed … Read more
The font for the key can be set in gnuplot 4.4. For example: set key font “,20” would set the size of the font to 20.
The glibc manual describes each feature test macro (FTM) including _DEFAULT_SOURCE: If you define this macro, most features are included apart from X/Open, LFS and GNU extensions: the effect is to enable features from the 2008 edition of POSIX, as well as certain BSD and SVID features without a separate feature test macro to control … Read more
_GNU_SOURCE is the only one you should ever define yourself. __USE_GNU is defined internally through a mechanism in features.h (which is included by all other glibc headers) when _GNU_SOURCE is defined, and possibly under other conditions. Defining or undefining __USE_GNU yourself will badly break the glibc headers.
write the commands in a file and execute gdb with -x switch gdb -x command_file_name or run the gdb source command while gdb is running if you dont want to specify a command file from command line >source [-s] [-v] command_file_name
Newer versions of GCC have an -MP option which can be used with -MD. I simply added -MP and -MD to the CPPFLAGS variable for my project (I did not write a custom recipe for compiling C++) and added an “-include $(SRC:.cpp=.d)” line. Using -MD and -MP gives a dependency file which includes both the … Read more
fixed, using: sudo apt-get install gcc-arm*
Depending on your kernel, the DMI information may be available via sysfs. Try those: # cat /sys/class/dmi/id/board_serial xxxxxxxxxxxxxxx # cat /sys/class/dmi/id/product_uuid xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx or using a tool # dmidecode -s baseboard-serial-number … # dmidecode -s system-uuid …
The exit status of grep doesn’t necessarily indicate an error ; it indicates success or failure. grep defines success as matching 1 or more lines. Failure includes matching zero lines, or some other error that prevented matching from taking place in the first place. -q is used when you don’t care about which lines matched, only … Read more