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Reduce command length in regen-ulps.

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I found that "make regen-ulps" failed when building with unmodified
GNU make 4.1, and an objdir /some/where/math/ longer than about 37
characters, because the list of tests in the "for run in $^" loop
exceeded the Linux kernel's MAX_ARG_STRLEN limit (131072 bytes) on the
length of a single argument passed to a command.

Some GNU/Linux distributions have a patch to make to work around this
limit (see e.g. Debian bug 688601), but clearly this ought to work
without needing such a patch.  This patch arranges for the shell loop
to be over the test names without a $(objdir) prefix, which reduces
the space used to less than half MAX_ARG_STRLEN.

(I think we ought to aim to get rid of bits/mathinline.h completely -
filing GCC bugs for any optimizations GCC can't currently do with
-ffast-math - which would mean we could halve the number of libm tests
run because separate inline function tests would no longer be needed.
However, with a long directory name even half the number of tests
could make this command exceed MAX_ARG_STRLEN without my patch.)

Tested regen-ulps on a system where it failed before this patch.

	* math/Makefile (run-regen-ulps): Add $(objpfx) to test name here.
	(regen-ulps): Use $(libm-tests) not $^ in shell loop.
This commit is contained in:
Joseph Myers 2018-01-02 18:33:18 +00:00
parent 4cf82d2379
commit b9256ab6bb
2 changed files with 7 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-01-02 Joseph Myers <joseph@codesourcery.com>
* math/Makefile (run-regen-ulps): Add $(objpfx) to test name here.
(regen-ulps): Use $(libm-tests) not $^ in shell loop.
2018-01-02 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
* NEWS: Add cosf and sincosf to list of optimized functions.

4
math/Makefile
View File

@ -521,12 +521,12 @@ include $(o-iterator)
run-regen-ulps = $(test-wrapper-env) \
$(run-program-env) \
$($*-ENV) $(rtld-prefix) $${run}
$($*-ENV) $(rtld-prefix) $(objpfx)$${run}
regen-ulps: $(addprefix $(objpfx),$(libm-tests))
rm -f $(objpfx)ULPs; rm -f $(objpfx)NewUlps; \
cp $(ulps-file) $(objpfx)libm-test-ulps; \
for run in $^; do \
for run in $(libm-tests); do \
echo "Regenerating ULPs for $${run}"; \
$(run-regen-ulps) -u -o $(objpfx); \
cat $(objpfx)ULPs >> $(objpfx)libm-test-ulps; \