Hi Jonathan:
Are there some examples for this @file using in GCC command option?
Locally we usually create makefile and call GCC to compile similar as below script:
# Collect GCC options (include dirs, defines etc.)
CC := gcc
CC_OPTS := -c -ggdb3 -std=gnu99 -Winline -w -fgnu89-inline -g -fomit-frame-pointer
CC_OPTS += -include Platformtypes_Stubs.h
CC_OPTS += $(foreach d, $(INCDIRS), -I$d)
CC_OPTS += $(foreach p, $(INCDIRS_PTU), -I$d)
CC_OPTS += $(foreach d, $(DEFINES), -D$d)
# Options for static library build
AR := ar
AR_OPTS := rcs
$(OBJDIR)/%.o: $(OBJDIR)/%.c
@echo Compiling: $(<F)
@$(CC) $(CC_OPTS) $< -o $@
Now on above script, we find GCC command option in CC_OPTS content is too huge(About 12000 bytes inside) and it can not be analyzed totally in gcc command.
Regards,
----------------------------------------------
Martin
From: Jonathan Wakely <jwakely.gcc@xxxxxxxxx>
Sent: 2021年8月31日 16:03
To: Luo Xinsheng SGH ADWA4 <xinsheng.luo@xxxxxx>
Cc: gcc-help <gcc-help@xxxxxxxxxxx>
Subject: Re: Query on GCC command options size limit
On Tue, 31 Aug 2021, 07:43 Luo Xinsheng SGH ADWA4 via Gcc-help, <gcc-help@xxxxxxxxxxx<mailto:gcc-help@xxxxxxxxxxx>> wrote:
Dear sir:
Now I am using GCC to compile a series .c file with a huge directory to search for header files.
I find on GCC command options, there seems to be the size limit on provided options.
>From my test on GCC version 4.8.5, the options length which I can provide seems to be limited at 12000 characters.
Can you share the size limit of GCC command options?
I think the limit probably comes from the shell, not from GCC.
You can use the @file option to pass extra options to GCC in a file, instead of on the command line. See the last option in the page at:
https://gcc.gnu.org/onlinedocs/gcc-4.8.5/gcc/Overall-Options.html
Best Regards
----------------------------------------------------
Martin
