Date: Fri, 23 Oct 2015 00:31:09 +0200 From: Denys Vlasenko <vda.linux@...glemail.com> To: musl <musl@...ts.openwall.com>, Rich Felker <dalias@...c.org> Subject: Having hard time adding to CFLAGS Let's say I need to add a gcc option to my musl build. configure says: ... Some influential environment variables: CC C compiler command [detected] CFLAGS C compiler flags [-Os -pipe ...] CROSS_COMPILE prefix for cross compiler and tools [none] LIBCC compiler runtime library [detected So I try this, combining all possible ways of passing CFLAGS (past experience is that different projects do it differently). CFLAGS is in environment, and on both configure and make command lines: export CFLAGS="-falign-functions=1" # for example ./configure CFLAGS="$CFLAGS" make CFLAGS="$CFLAGS" It does work, but resulting libc.so is twice as big: text data bss dec hex filename 564099 1944 11768 577811 8d113 musl.1/lib/libc.so 917805 2130 11736 931671 e3757 musl.2/lib/libc.so The cause is that gcc invocation for each .c file in both cases start normally: gcc -std=c99 -nostdinc -ffreestanding -fexcess-precision=standard -frounding-math -D_XOPEN_SOURCE=700 -I./arch/x86_64 -I./src/internal -I./include... but then, build without explicit CFLAGS use this: ... -Os -pipe -fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables -Wa,--noexecstack -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -include vis.h -fPIC -DSHARED -c -o src/aio/aio.lo src/aio/aio.c and one with CFLAGS loses these flags, in particular, it has no -Os and no -fPIC: ... -falign-functions=1 -c -o src/aio/aio.o src/aio/aio.c Evidently, my CFLAGS replaced needed flags instead of being added at the end. Can this be fixed? If user needs to use e.g. EXTRA_CFLAGS instead, please fix configure --help.
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.