The ultimate way for iPhone users to stop oversleeping

Wed, 01 Dec 2021 17:15:57 +0900

This article was machine-translated from the Japanese version.

This article is for Day 1 of Table Game Tansu Advent Calendar 2021.

Last time was Raira’s I wanna sing the Carol( ) on the final day of 2020.

This article is intended for iPhone users who are not suffering from insomnia.
If you use Android or another smartphone, please consider purchasing an iPhone while reading this article.
If you suffer from insomnia, please be outraged that such an infuriating article was written.

blurhash v0.1.2 compilation error investigation

Mon, 06 May 2019 01:49:18 +0900

This article was machine-translated from the Japanese version.

What happened

In Mastodon v2.8.1, a bug occurred where gem install blurhash would fail in certain environments. This issue has been fixed in v2.8.2.

https://mstdn.jp/@yi0713/102008223252331858

CentOS勢、masterに追加された blurhash というgemのインストールでコケると思います。原因は gcc が 4.8.5 と古いためのようです

https://mastodon.social/@Mastodon/102044104623035256

Some people have reported problems installing Mastodon v2.8.1 due to gem compilation.
This and a few other small bugs have been fixed in #Mastodon v2.8.2

Reproducing the bug

$ cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)
$ gem install blurhash -v 0.1.2
Building native extensions.  This could take a while...
ERROR:  Error installing blurhash:
        ERROR: Failed to build gem native extension.

    /usr/bin/ruby extconf.rb
creating Makefile

make "DESTDIR="
gcc -I. -I/usr/include -I/usr/include/ruby/backward -I/usr/include -I.   -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -mtune=generic -fPIC -m64 -o encode.o -c encode.c
encode.c: In function 'blurHashForPixels':
encode.c:28:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int y = 0; y < yComponents; y++) {
  ^
encode.c:28:2: note: use option -std=c99 or -std=gnu99 to compile your code
encode.c:29:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for(int x = 0; x < xComponents; x++) {
   ^
encode.c:48:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for(int i = 0; i < acCount * 3; i++) {
   ^
encode.c:62:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int i = 0; i < acCount; i++) {
  ^
encode.c: In function 'multiplyBasisFunction':
encode.c:75:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int y = 0; y < height; y++) {
  ^
encode.c:76:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for(int x = 0; x < width; x++) {
   ^
encode.c: In function 'encode_int':
encode.c:129:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int i = 0; i < length - 1; i++) divisor *= 83;
  ^
encode.c:131:10: error: redefinition of 'i'
  for(int i = 0; i < length; i++) {
          ^
encode.c:129:10: note: previous definition of 'i' was here
  for(int i = 0; i < length - 1; i++) divisor *= 83;
          ^
encode.c:131:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int i = 0; i < length; i++) {
  ^
make: *** [encode.o] Error 1


Gem files will remain installed in /usr/local/share/gems/gems/blurhash-0.1.2 for inspection.
Results logged to /usr/local/share/gems/gems/blurhash-0.1.2/ext/blurhash/gem_make.out

Cause

As shown in the error during reproduction, this is because int i is declared within the for loop. This specification was introduced in C99, and requires -std=c99 to be specified during compilation.

Misc on Unigiri

The ultimate way for iPhone users to stop oversleeping

blurhash v0.1.2 compilation error investigation

What happened

Reproducing the bug

Cause