Package: libtool;
Reported by: Eric Blake <eblake <at> redhat.com>
Date: Fri, 2 Dec 2011 18:42:01 UTC
Severity: normal
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bug-libtool <at> gnu.org:bug#10197; Package libtool.
(Fri, 02 Dec 2011 18:42:02 GMT) Full text and rfc822 format available.Eric Blake <eblake <at> redhat.com>:bug-libtool <at> gnu.org.
(Fri, 02 Dec 2011 18:42:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Eric Blake <eblake <at> redhat.com> To: bug-libtool <at> gnu.org Subject: compilation failure with no message caused by libtool Date: Fri, 02 Dec 2011 11:41:22 -0700
[Message part 1 (text/plain, inline)]
I ran into a weird case today - trying to compile libvirt with CFLAGS including -Wsuggest-attribute=pure -fipa-pure-const produced a compile failure, but no message. It turns out that for the file in question, libtool ended up compiling things twice, but gcc only warns when -fPIC is not in effect (for some reason, the combination of fPIC and -fipa-pure-const appears to not catch the warning, unless -O is also present). $ gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../src/util -I../include -DIN_LIBVIRT -I/usr/include/libxml2 -Wsuggest-attribute=pure -fipa-pure-const -c util/buf.c -fPIC -DPIC -o a.o $ gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../src/util -I../include -DIN_LIBVIRT -I/usr/include/libxml2 -Wsuggest-attribute=pure -fipa-pure-const -c util/buf.c -o b.o util/buf.c:86:1: warning: function might be candidate for attribute ‘pure’ [-Wsuggest-attribute=pure] util/buf.c:227:1: warning: function might be candidate for attribute ‘pure’ [-Wsuggest-attribute=pure] util/buf.c:242:1: warning: function might be candidate for attribute ‘pure’ [-Wsuggest-attribute=pure] But because the warning only occurs during the second compilation, I end up with no warning message: $ make make all-am make[1]: Entering directory `/home/remote/eblake/libvirt/src' CC libvirt_util_la-buf.lo make[1]: *** [libvirt_util_la-buf.lo] Error 1 make[1]: Leaving directory `/home/remote/eblake/libvirt/src' make: *** [all] Error 2 Proof that -O makes a difference: $ gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../src/util -I../include -DIN_LIBVIRT -I/usr/include/libxml2 -Wsuggest-attribute=pure -fipa-pure-const -c util/buf.c -fPIC -DPIC -o a.o -O util/buf.c: In function ‘virBufferGetIndent’: util/buf.c:86:1: warning: function might be candidate for attribute ‘pure’ [-Wsuggest-attribute=pure] util/buf.c: In function ‘virBufferError’: util/buf.c:227:1: warning: function might be candidate for attribute ‘pure’ [-Wsuggest-attribute=pure] util/buf.c: In function ‘virBufferUse’: util/buf.c:242:1: warning: function might be candidate for attribute ‘pure’ [-Wsuggest-attribute=pure] The full libtool invocation in question: $ make V=1 make all-am make[1]: Entering directory `/home/remote/eblake/libvirt/src' /bin/sh ../libtool --tag=CC --mode=compile ccache gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../src/util -I../include -DIN_LIBVIRT -I/usr/include/libxml2 -Wall -W -Wformat-y2k -Wformat-security -Winit-self -Wmissing-include-dirs -Wunused -Wunknown-pragmas -Wstrict-aliasing -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-align -Wwrite-strings -Wlogical-op -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -Wnested-externs -Winline -Winvalid-pch -Wvolatile-register-var -Wdisabled-optimization -Wbuiltin-macro-redefined -Wmudflap -Wpacked-bitfield-compat -Wsync-nand -Wattributes -Wcoverage-mismatch -Wmultichar -Wabi -Wcpp -Wdeprecated -Wdeprecated-declarations -Wdiv-by-zero -Wdouble-promotion -Wendif-labels -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-zero-length -Wformat=2 -Wmultichar -Wnormalized=nfc -Woverflow -Wpointer-to-int-cast -Wpragmas -Wsuggest-attribute=const -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure -Wtrampolines -Wno-missing-field-initializers -Wno-sign-compare -Wjump-misses-init -Wno-format-nonliteral -Wframe-larger-than=4096 -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-all --param=ssp-buffer-size=4 -fexceptions -fasynchronous-unwind-tables -fdiagnostics-show-option -funit-at-a-time -fipa-pure-const -Werror -g -MT libvirt_util_la-buf.lo -MD -MP -MF .deps/libvirt_util_la-buf.Tpo -c -o libvirt_util_la-buf.lo `test -f 'util/buf.c' || echo './'`util/buf.c libtool: compile: ccache gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../src/util -I../include -DIN_LIBVIRT -I/usr/include/libxml2 -Wall -W -Wformat-y2k -Wformat-security -Winit-self -Wmissing-include-dirs -Wunused -Wunknown-pragmas -Wstrict-aliasing -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-align -Wwrite-strings -Wlogical-op -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -Wnested-externs -Winline -Winvalid-pch -Wvolatile-register-var -Wdisabled-optimization -Wbuiltin-macro-redefined -Wmudflap -Wpacked-bitfield-compat -Wsync-nand -Wattributes -Wcoverage-mismatch -Wmultichar -Wabi -Wcpp -Wdeprecated -Wdeprecated-declarations -Wdiv-by-zero -Wdouble-promotion -Wendif-labels -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-zero-length -Wformat=2 -Wmultichar -Wnormalized=nfc -Woverflow -Wpointer-to-int-cast -Wpragmas -Wsuggest-attribute=const -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure -Wtrampolines -Wno-missing-field-initializers -Wno-sign-compare -Wjump-misses-init -Wno-format-nonliteral -Wframe-larger-than=4096 -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-all --param=ssp-buffer-size=4 -fexceptions -fasynchronous-unwind-tables -fdiagnostics-show-option -funit-at-a-time -fipa-pure-const -Werror -g -MT libvirt_util_la-buf.lo -MD -MP -MF .deps/libvirt_util_la-buf.Tpo -c util/buf.c -fPIC -DPIC -o .libs/libvirt_util_la-buf.o libtool: compile: ccache gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../src/util -I../include -DIN_LIBVIRT -I/usr/include/libxml2 -Wall -W -Wformat-y2k -Wformat-security -Winit-self -Wmissing-include-dirs -Wunused -Wunknown-pragmas -Wstrict-aliasing -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-align -Wwrite-strings -Wlogical-op -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -Wnested-externs -Winline -Winvalid-pch -Wvolatile-register-var -Wdisabled-optimization -Wbuiltin-macro-redefined -Wmudflap -Wpacked-bitfield-compat -Wsync-nand -Wattributes -Wcoverage-mismatch -Wmultichar -Wabi -Wcpp -Wdeprecated -Wdeprecated-declarations -Wdiv-by-zero -Wdouble-promotion -Wendif-labels -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-zero-length -Wformat=2 -Wmultichar -Wnormalized=nfc -Woverflow -Wpointer-to-int-cast -Wpragmas -Wsuggest-attribute=const -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure -Wtrampolines -Wno-missing-field-initializers -Wno-sign-compare -Wjump-misses-init -Wno-format-nonliteral -Wframe-larger-than=4096 -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-all --param=ssp-buffer-size=4 -fexceptions -fasynchronous-unwind-tables -fdiagnostics-show-option -funit-at-a-time -fipa-pure-const -Werror -g -MT libvirt_util_la-buf.lo -MD -MP -MF .deps/libvirt_util_la-buf.Tpo -c util/buf.c -o libvirt_util_la-buf.o >/dev/null 2>&1 make[1]: *** [libvirt_util_la-buf.lo] Error 1 make[1]: Leaving directory `/home/remote/eblake/libvirt/src' make: *** [all] Error 2 Any suggestions on how to make libtool display the compiler errors that occur only when -fPIC is missing? Or am I stuck not using -fipa-pure-const without also passing -O? -- Eric Blake eblake <at> redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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bug-libtool <at> gnu.org:bug#10197; Package libtool.
(Fri, 02 Dec 2011 19:50:02 GMT) Full text and rfc822 format available.Message #8 received at 10197 <at> debbugs.gnu.org (full text, mbox):
From: Peter O'Gorman <peter <at> pogma.com> To: Eric Blake <eblake <at> redhat.com> Cc: 10197 <at> debbugs.gnu.org Subject: Re: bug#10197: compilation failure with no message caused by libtool Date: Fri, 02 Dec 2011 13:49:03 -0600
On 12/02/2011 12:41 PM, Eric Blake wrote: > > Any suggestions on how to make libtool display the compiler errors that > occur only when -fPIC is missing? Or am I stuck not using > -fipa-pure-const without also passing -O? Does -no-suppress do this? Peter
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