Category Archives: compilation

Kernel – GCC8 / ‘Objtool Warnings’ Patches..

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There are now patches available to deal with the host of ‘objtool‘ warnings when compiling the kernel with GCC8: …………………………….. drivers/video/fbdev/core/fbmem.o: warning: objtool: fb_set_var()+0x209: sibling call from callable instruction with modified stack frame drivers/video/fbdev/core/fbmem.o: warning: objtool: do_remove_conflicting_framebuffers()+0xa6: sibling call from callable instruction with modified stack frame drivers/video/fbdev/core/fbmem.o: warning: objtool: register_framebuffer()+0x14b: sibling call from callable instruction with modified … Continue reading →

GCC – Update to 8.1.1 – Still Gives Kernel Compile Warnings..

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Fedora 28 has GCC 8.1.1 available (currently in ‘updates-testing‘ repo), and I tested this with Kernel 4.17-rc4, to see if there was any improvement in the horde of warnings generated with 8.0.1. In short, there is no real difference: ……………………………… CC security/keys/request_key.o arch/x86/kvm/lapic.o: warning: objtool: kvm_lapic_reg_read()+0x126: sibling call from callable instruction with modified stack frame arch/x86/kvm/lapic.o: warning: … Continue reading →

Fedora – F28 GCC 8 Now OK with Kernel 4.16.7, and fix for Grub-Customizer..

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Tried Kernel 4.16.7 on Fedora 28 (GCC 8.0.1), and this now compiles successfully, although still with a lot of ‘warnings’.. I use grub-customizer with each new kernel, and the F28 version of this fails: # grub-customizer Error creating proxy: The connection is closed (g-io-error-quark, 18) *** initializing (w/o specified bootloader type)… * reading partition info… /usr/include/c++/8/bits/basic_string.h:1048: std::__cxx11::basic_string<_CharT, … Continue reading →

Fedora – 28 Released, but Fails with GCC 8 and Kernel 4.16…

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Fedora 28 has been released, but this includes GCC 8 (8.0.1) which – currently – is not capable of compiling Kernel 4.16 as-is (tested with 4.16.6): ……………………………. CC /usr/src/linux-4.16.6/tools/objtool/objtool.o CC /usr/src/linux-4.16.6/tools/objtool/libstring.o CC /usr/src/linux-4.16.6/tools/objtool/str_error_r.o ../lib/str_error_r.c: In function ‘str_error_r’: ../lib/str_error_r.c:25:3: error: passing argument 1 to restrict-qualified parameter aliases with argument 5 [-Werror=restrict] snprintf(buf, buflen, “INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d”, … Continue reading →

Kernel – 4.17-rc3 Released – Still OK with Latest NVIDIA and VMware..

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Kernel 4.17-rc3 is out, and brief details of changes from -rc2 are here:  http://lkml.iu.edu/hypermail/linux/kernel/1804.3/05507.html Tested with NVIDIA 396.18 and VMware 14.1.1 (vmmon and vmnet), and all still compile OK.. Robert Gadsdon.   April 29, 2018. … Continue reading →

Kernel – GCC 8 Tests – Not Quite Ready…

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I decided to try updating a crash-and-burn test system to Fedora 28 (early-beta..) as this included GCC 8 (currently 8.0.1), to see how well the Kernel (4.16-rc6) compiled.. There were a lot of warnings generated: …………………… CC [M] drivers/rtc/rtc-pcf8523.o CC drivers/usb/core/file.o CC drivers/video/hdmi.o CC [M] drivers/rtc/rtc-pcf8563.o drivers/video/hdmi.c: In function ‘hdmi_spd_infoframe_init’: drivers/video/hdmi.c:171:2: warning: ‘strncpy’ specified bound 8 equals … Continue reading →

Kernel – GCC 8 Tests – Not Quite Ready…

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I decided to try updating a crash-and-burn test system to Fedora 28 (early-beta..) as this included GCC 8 (currently 8.0.1), to see how well the Kernel (4.16-rc6) compiled.. There were a lot of warnings generated: …………………… CC [M] drivers/rtc/rtc-pcf8523.o CC drivers/usb/core/file.o CC drivers/video/hdmi.o CC [M] drivers/rtc/rtc-pcf8563.o drivers/video/hdmi.c: In function ‘hdmi_spd_infoframe_init’: drivers/video/hdmi.c:171:2: warning: ‘strncpy’ specified bound 8 equals … Continue reading →

IA64 – Updated to 4.16-rc3..

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Just updated the HP RX2600 to Kernel 4.16-rc3, and apart from an odd quirk at compile time, all went OK.. ………….. Building modules, stage 2. MODPOST 98 modules GZIP arch/ia64/hp/sim/boot/vmlinux.gz File “./arch/ia64/scripts/unwcheck.py”, line 19 print “Usage: %s FILE” % sys.argv[0] ^ SyntaxError: Missing parentheses in call to ‘print’ make: [arch/ia64/Makefile:78: unwcheck] Error 1 (ignored) ……………… Despite this, … Continue reading →

Kernel – GCC and ‘Retpoline’..

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The recent summary of Kernel 4.15 mentioned the test for ‘compliant’ versions of GCC which fully support the retpoline mitigation, but only gave an example of non-compliance: With GCC 7.2: ~]$ cat /sys/devices/system/cpu/vulnerabilities/spectre_v2  Vulnerable: Minimal generic ASM retpoline I re-created Fedora (Rawhide) GCC 7.3.1 for Fedora 27, and it gives the following, after Kernel 4.15 compilation/boot: ~]$ … Continue reading →

Kernel – 4.14.11 ‘Final’ Breaks NVIDIA 384.98 and 387.34 – GPL Error..

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I had previously tested Kernel 4.14.11-rc1 with the 4.14.9+-patched NVIDIA driver 384.98, and that was OK: ………………….. ld -r -o /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-modeset/nv-modeset-interface.o /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-modeset/nvidia-modeset-linux.o Building modules, stage 2. MODPOST 4 modules CC /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-drm.mod.o LD [M] /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-drm.ko CC /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-modeset.mod.o LD [M] /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-modeset.ko CC /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-uvm.mod.o LD [M] /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia-uvm.ko CC /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia.mod.o LD [M] /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-384.98-41410/kernel/nvidia.ko make[2]: Leaving directory ‘/usr/src/linux-4.14.11-rc1’ make[1]: Leaving directory ‘/usr/src/linux-4.14.11-rc1’ … Continue reading →