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I have a makefile that compiles every .c file in my project. For each file, I get the whole compile command printed out to the shell, with all the options and flags. This is the example output for one file:
arm-none-eabi-gcc -c -mcpu=cortex-m3 -O0 -dM -g -gdwarf-2 -mthumb -fomit-frame-pointer -fverbose-asm -Wa,-ahlms=src/sim/sim_configuration.lst -include ./lib/stm32core/stm32f2xx_conf.h -I . -I./lib/ARMStandardLibrary -I./lib/LwIP -I./lib/LwIP/src/include -I./lib/LwIP/src/include -I./lib/LwIP/src/include/ipv4 -I./lib/LwIP/src/include/ipv6 -I./lib/FatFS -I./lib/stm32core -I./src -I./src/sim -I./src/sd -I./src/tftp src/sim/sim_configuration.c -o src/sim/sim_configuration.o
The problem is that various warnings get lost inside this whole mess of command outputs. Is there a way to only print the warnings and errors that appear (not the original command)?
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-w is the GCC-wide option to disable warning messages.
Maybe you can look for CFLAGS options in Makefile and remove the -Werror flag. The Werror flag will make all warnings into errors. Show activity on this post. In general, it is not a good idea to ignore warnings from your compiler.
You can make all warnings being treated as such using -Wno-error. You can make specific warnings being treated as such by using -Wno-error=<warning name> where <warning name> is the name of the warning you don't want treated as an error. If you want to entirely disable all warnings, use -w (not recommended).
GCC 4.3+ now has -Q --help=warnings , and you can even specify --help=warnings,C to just print out the C related warnings.
Execute make with the -s option. From the man page.
-s, --silent, --quiet
Silent operation; do not print the commands as they are executed.
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