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gcc-4.9 notices that the validate_init() function returns unintialized data when called with a zero 'nr_buffers' argument, when called with the -Wmaybe-uninitialized flag: drivers/gpu/drm/nouveau/nouveau_gem.c: In function ‘validate_init.isra.6’: drivers/gpu/drm/nouveau/nouveau_gem.c:457:5: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized] However, the only caller of this function always passes a nonzero argu...

nouveau_compiler.c: In function ‘main’: nouveau_compiler.c:216:27: warning: ‘code’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%08x ", code[i / 4]); ^ nouveau_compiler.c:215:4: warning: ‘size’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i = 0; i < size; i += 4) { Signed-off-by: Tobias Klausmann <tobias.johannes.klausm...

...: > Compiler is wrong. > > On Wed, Jul 8, 2015 at 2:27 PM, Tobias Klausmann > <tobias.johannes.klausmann at mni.thm.de> wrote: >> nouveau_compiler.c: In function ‘main’: >> nouveau_compiler.c:216:27: warning: ‘code’ may be used uninitialized in >> this function [-Wmaybe-uninitialized] >> printf("%08x ", code[i / 4]); >> ^ >> nouveau_compiler.c:215:4: warning: ‘size’ may be used uninitialized in >> this function [-Wmaybe-uninitialized] >> for (i = 0; i < size; i += 4) { >> >&...

...eeprom93xx.o > CC i386-dm/eepro100.o > /?PKGBUILDDIR?/debian/build/build-utils_amd64/qemu/hw/eepro100.c: In function 'eepro100_read4': > /?PKGBUILDDIR?/debian/build/build-utils_amd64/qemu/hw/eepro100.c:1232:5: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] > /?PKGBUILDDIR?/debian/build/build-utils_amd64/qemu/hw/eepro100.c: In function 'eepro100_read1': > /?PKGBUILDDIR?/debian/build/build-utils_amd64/qemu/hw/eepro100.c:1179:5: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] > /...

...tra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Winit-self -Winline -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmultichar -Wnarrowing -Wnested-externs -Wnonnull -Wold-style-declaration -Wold-style-definition -Woverflow -Woverride-init -Wpacked-bitfield-com...

...Wall -mtune=generic -c largestContinuousMinimum.cpp -o largestContinuousMinimum.o largestContinuousMinimum.cpp: In function 'int largestContinuousMinimum(int, double*, double*, int*)': largestContinuousMinimum.cpp:38:27: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] index_vec[0] = start; ^ c:/Rtools/mingw_64/bin/g++ -std=gnu++11 -I"C:/PROGRA~1/R/R-36~1.0/include" -DNDEBUG -O2 -Wall -mtune=generic -c modelSelection.cpp -o modelSelection.o /usr/bin/sed: -e expression #1, char 1: unknown comma...

...Wall -mtune=generic -c largestContinuousMinimum.cpp -o largestContinuousMinimum.o largestContinuousMinimum.cpp: In function 'int largestContinuousMinimum(int, double*, double*, int*)': largestContinuousMinimum.cpp:38:27: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] index_vec[0] = start; ^ c:/Rtools/mingw_64/bin/g++ -std=gnu++11 -I"C:/PROGRA~1/R/R-36~1.0/include" -DNDEBUG -O2 -Wall -mtune=generic -c modelSelection.cpp -o modelSelection.o /usr/bin/sed: -e expression #1, char 1: unknown comma...

Compiling LLVM with gcc, 4.3 and upwards, seems to give compile warnings. Is there any canonical gcc version that should be used (for building trunk)? >From http://llvm.org/docs/HowToReleaseLLVM.html#release-build: The builds of llvm, clang, and dragonegg must be free of errors and warnings in Debug, Release+Asserts, and Release builds. The table below specifies which compilers are used

gcc 4.8.5 emits the following false positive: drivers/virtio/virtio_ring.c: In function 'vring_create_virtqueue': drivers/virtio/virtio_ring.c:1032:5: warning: 'queue' may be used uninitialized in this function [-Wmaybe-uninitialized] Silence it. Signed-off-by: Jiri Benc <jbenc at redhat.com> --- drivers/virtio/virtio_ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 5c802d47892c..ca6bfddaacad 100644 --- a/drivers/...

gcc 4.8.5 emits the following false positive: drivers/virtio/virtio_ring.c: In function 'vring_create_virtqueue': drivers/virtio/virtio_ring.c:1032:5: warning: 'queue' may be used uninitialized in this function [-Wmaybe-uninitialized] Silence it. Signed-off-by: Jiri Benc <jbenc at redhat.com> --- drivers/virtio/virtio_ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 5c802d47892c..ca6bfddaacad 100644 --- a/drivers/...

...t;) on Windows, for example: D:/Rtools/mingw_32/bin/gcc -I"D:/R/R-35~1.0/include" -DNDEBUG -O3 -Wall -std=gnu99 -mtune=generic -c agfit4.c -o agfit4.o agfit4.c: In function 'agfit4': agfit4.c:334:20: warning: 'dtime' may be used uninitialized in this function [-Wmaybe-uninitialized] if (tstop[p] < dtime) break; /* no more to add */ When I build using R CMD build however, the file agfit4.c is never even built. That explains the undefined references, but I have no clue what the difference is between both methods. I suspected a newer version...

...ns-nul -Wformat-extra-args -Wformat-security -Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Winit-self -Winline -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wjump-misses-init -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmultichar -Wnarrowing -Wnested-externs -Wnonnull -Wnormalized=nfc -Wold-style-declaration -Wold-style-definition -Woverflow -Woverride-init -Wpa...

Thanks Guido, unfortunately no luck: root@<server>:~/debian# grep DEB_CONFIGURE_EXTRA_ARGS * grep: apparmor: Is a directory grep: patches: Is a directory grep: source: Is a directory root@<server>:~/debian# root@<server>:~/debian# root@<server>:~/debian# root@<server>:~/debian# grep DEB_CONFIGURE_EXTRA_ARGS */* root@<server>:~/debian#

...argestContinuousMinimum.cpp > -o largestContinuousMinimum.o > largestContinuousMinimum.cpp: In function 'int > largestContinuousMinimum(int, double*, double*, int*)': > largestContinuousMinimum.cpp:38:27: warning: 'start' may be used > uninitialized in this function [-Wmaybe-uninitialized] > index_vec[0] = start; > ^ > c:/Rtools/mingw_64/bin/g++ -std=gnu++11 -I"C:/PROGRA~1/R/R-36~1.0/include" > -DNDEBUG -O2 -Wall -mtune=generic -c modelSelection.cpp -o > modelSelection.o > /usr/bin/sed: -e expr...

...tra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Winit-self -Winline -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmultichar -Wnarrowing -Wnested-externs -Wnonnull -Wold-style-declaration -Wold-style-definition -Woverflow -Woverride-init -Wpacked-bitfield-com...

...pp > > -o largestContinuousMinimum.o > > largestContinuousMinimum.cpp: In function 'int > > largestContinuousMinimum(int, double*, double*, int*)': > > largestContinuousMinimum.cpp:38:27: warning: 'start' may be used > > uninitialized in this function [-Wmaybe-uninitialized] > > index_vec[0] = start; > > ^ > > c:/Rtools/mingw_64/bin/g++ -std=gnu++11 > -I"C:/PROGRA~1/R/R-36~1.0/include" > > -DNDEBUG -O2 -Wall -mtune=generic -c modelSelection.cpp -o > > modelSelectio...

...tra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Winit-self -Winline -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmultichar -Wnarrowing -Wnested-externs -Wnonnull -Wold-style-declaration -Wold-style-definition -Woverflow -Woverride-init -Wpacked-bitfield-com...

...gned -Wignored-attributes -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wincompatible-pointer-types -Winit-self -Winline -Wint-conversion -Wint-in-bool-context -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-not-parentheses -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmemset-elt-size -Wmemset-transposed-args -Wmisleading-indentation -Wmissing-attributes -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-profile -Wmissing-prototypes -Wmultichar -Wmultistatement-macros -Wn...

...argestContinuousMinimum.cpp > -o largestContinuousMinimum.o > largestContinuousMinimum.cpp: In function 'int > largestContinuousMinimum(int, double*, double*, int*)': > largestContinuousMinimum.cpp:38:27: warning: 'start' may be used > uninitialized in this function [-Wmaybe-uninitialized] > index_vec[0] = start; > ^ > c:/Rtools/mingw_64/bin/g++ -std=gnu++11 -I"C:/PROGRA~1/R/R-36~1.0/include" > -DNDEBUG -O2 -Wall -mtune=generic -c modelSelection.cpp -o > modelSelection.o > /usr/bin/sed: -e expres...