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8f6a0ee959
Fix the "@gprel relocation against dynamic symbol xxx" linker error. Variables defined in the link unit and small enough to be put in the short data section will have a gp-relative access sequence (using the @gprel relocation). It is invalid to have @gprel relocations in shared libraries, because they are to be resolved by the static linker and not the dynamic linker. The -fpic option will cause @ltoff relocations for @gprel relocations, but the side-effects are untested (if any). Instead, disable/eliminate the short data section to achieve the same.
51 lines
1.7 KiB
Makefile
51 lines
1.7 KiB
Makefile
# $FreeBSD$
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#
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# Warning flags for compiling the kernel and components of the kernel.
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#
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# Note that the newly added -Wcast-qual is responsible for generating
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# most of the remaining warnings. Warnings introduced with -Wall will
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# also pop up, but are easier to fix.
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CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
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-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
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-fformat-extensions -ansi
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#
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# The following flags are next up for working on:
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# -W
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#
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# On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC
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# 2.95 adds code to the entry and exit point of every function to align the
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# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
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# per function call. While the 16-byte alignment may benefit micro benchmarks,
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# it is probably an overall loss as it makes the code bigger (less efficient
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# use of code cache tag lines) and uses more stack (less efficient use of data
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# cache tag lines)
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#
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.if ${MACHINE_ARCH} == "i386"
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CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2
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.endif
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#
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# On the alpha, make sure that we don't use floating-point registers and
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# allow the use of BWX etc instructions (only needed for low-level i/o).
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# Also, reserve register t7 to point at per-cpu global variables.
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#
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.if ${MACHINE_ARCH} == "alpha"
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CFLAGS+= -mno-fp-regs -ffixed-8 -Wa,-mev6
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.endif
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#
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# For IA-64, we use r13 for the kernel globals pointer and we only use
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# a very small subset of float registers for integer divides.
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#
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.if ${MACHINE_ARCH} == "ia64"
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CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -mno-sdata
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.endif
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#
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# GCC 3.0 and above like to do certain optimizations based on the
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# assumption that the program is linked against libc. Stop this.
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#
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CFLAGS+= -ffreestanding
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